prEN 1366-14
(Main)Fire resistance tests for service installations - Part 14: Partial penetration seals
- Abstract
This part of the EN 1366 series specifies a method of test and criteria for the evaluation (including field of direct application rules) of the ability of a partial penetration seal to maintain the fire resistance of a separating element at the position at which it has been penetrated by a device or devices that passes through one face of the element only. Partial penetration seals are used to seal apertures for electrical sockets, downlighters, media devices, cables and any item which requires an opening to be made in one face of the element of construction but does not include a device which passes through both faces.
Supporting constructions are used in this part of the EN 1366 series to represent separating elements such as walls or floors. The supporting construction shall be a system that has been subject to a fire test in accordance with one of the following standards: EN 13381 1 for horizontal membranes, EN 13381 2 for vertical membranes, EN 1364 1 or EN 1365 1 for walls, EN 1366 3 for walls based on a standard supporting construction, or EN 1364 2 or EN 1365 2 for floors. This is referred to throughout this document as the applicable test standard for the supporting construction.
This part of the EN 1366 series is used in conjunction with EN 1363 1.
The purpose of a test described in this part of the EN 1366 series is to assess the integrity and insulation performance of the partial penetration seal, of the partially penetrating service(s) or device(s) and of the separating element in the surrounding area of the partial penetration seal. Where partial penetration seals are installed in loadbearing elements, it is possible that the loadbearing capacity is also considered.
It is not the intention of this test to provide quantitative information on the rate of leakage of smoke and/or hot gases or on the transmission or generation of fumes.
Tests in accordance with this part of the EN 1366 series are not intended to supply any information on the ability of the partial penetration seal to withstand stress caused by movements or displacements of the penetrating devices.
The risk of spread of fire downwards cannot be assessed with this test.
Tests in accordance with this part of the EN 1366 series do not address any risks associated with leakage of dangerous liquids or gases caused by failure of the device in case of fire.
- Status
- Not Published
- Publication Date
- 22-Nov-2027
- Technical Committee
- CEN/TC 127 - Fire safety in buildings
- Drafting Committee
- CEN/TC 127/WG 2 - Services
- Current Stage
- 4060 - Closure of enquiry - Enquiry
- Start Date
- 24-Sep-2026
- Due Date
- 03-Nov-2026
- Completion Date
- 24-Sep-2026
prEN 1366-14 is a CEN draft European Standard for fire resistance tests for service installations, Part 14: Partial penetration seals. It specifies how to test and evaluate seals for openings that are penetrated from one face of a wall, floor, or ceiling only, and it is intended for manufacturers, test laboratories, specifiers, and fire safety professionals who need results for product evaluation and direct application.
What does prEN 1366-14 specify?
prEN 1366-14 specifies a method of test and evaluation criteria for partial penetration seals and the surrounding separating element where a service or device passes through only one face of the element. It is used to judge integrity and insulation, and in loadbearing situations it can also consider loadbearing capacity.
The scope is focused on one-sided penetrations such as electrical sockets, downlighters, media devices, cables, and similar openings. The document is not aimed at quantifying smoke leakage, hot gas leakage, fumes, movement resistance, downward fire spread, or risks linked to dangerous liquids or gases if a device fails in fire.
The standard is organized into clauses 1 to 13 and normative annexes A to E. Annexes A, B, and C cover different wall applications, Annex D covers ceilings with loadbearing test, and Annex E covers floors.
| Annex | What it covers |
|---|---|
| A | Partial penetration seals for electrical sockets in walls |
| B | Partial penetration seals for devices other than electrical sockets in walls |
| C | Partial penetration seals for services in walls |
| D | Partial penetration seals in ceilings with loadbearing test |
| E | Partial penetration seals in floors |
What are the key requirements of prEN 1366-14?
prEN 1366-14 relies on the general fire test framework in EN 1363-1, with EN 1363-2 used when alternative or additional procedures apply. In practice, that means the test laboratory must follow the general furnace, measurement, and reporting rules from the basic fire-resistance test standards, then add the special rules for partial penetration seals.
Supporting construction and test setup
The supporting construction must represent the wall or floor being assessed, but it has to be a system already fire tested to one of the named standards for membranes, walls, or floors. This matters because the seal is being assessed in a realistic construction, not in isolation, and the fire resistance period of the supporting construction must be at least equal to that of the seal.
The test specimen must be installed as it would be in service, including wiring where relevant, and care must be taken not to give the device unintended support during the test. If more than one specimen is included in one construction, the setup must avoid interaction unless interaction is the point of the test.
Furnace conditions, pressure, and loading
Heating and furnace atmosphere follow EN 1363-1 or EN 1363-2. Pressure conditions follow the applicable supporting-construction standard, with extra limits for service positions, including the rule that services are only included where positive pressure exceeds 10 Pa. For horizontal constructions, a nominal 20 Pa pressure is maintained in the plane below the construction.
If the supporting construction is loadbearing, the test specimen is loaded according to the applicable supporting-construction standard. This is important because a seal in a loadbearing wall, floor, or ceiling may have to perform while the structure is carrying load.
Specimen dimensions and spacing
The specimen size follows the supporting-construction standard, but the seal must be kept at least 200 mm from furnace edges or perimeter boundaries to avoid edge effects. When more than one seal is tested in the same wall face or on opposite faces, the document sets minimum separations and also says that smaller real-life distances may be used if that is what is intended in practice.
Those distances must be recorded when they are less than 200 mm. In practical terms, this lets the test report show whether results apply to isolated seals or to seals installed close together.
Instrumentation and measurements
The document requires furnace plate thermometers, unexposed-face thermocouples, a roving thermocouple for local hot spots, and additional fixed thermocouples where hot spots are expected. The thermocouple positions depend on the size of the seal and on whether the penetration is a device, a blank seal, or a service emerging from the unexposed face.
This matters because the test is not only checking the average temperature of the assembly, but also local overheating around the opening, the service, and the seal edges.
Performance criteria and result expression
Insulation is judged by both maximum temperature rise at any thermocouple and average temperature rise across five thermocouples on the unexposed surface. Integrity is assessed in accordance with EN 1363-1, and loadbearing capacity follows the supporting-construction standard.
Results are reported as elapsed time to the nearest completed minute until the integrity and insulation criteria are no longer met. If several seals are in one test, each seal is judged separately unless they are closer than 200 mm in the plane of the wall, in which case they are judged as one specimen.
Direct field of application
The direct field of application is limited by the orientation tested, the supporting construction, seal size, device depth, and spacing. Seal size may be reduced but not increased, device depth may be reduced but not increased, and the distance between seals may be increased but not reduced.
That means the test can justify some smaller or more widely spaced real installations, but it does not automatically cover larger seals, deeper devices, or closer spacing than tested.
Annex-specific configurations
Annex A addresses electrical sockets in walls, including back to back arrangements, socket type, cable type, and socket cover variations. Annex B addresses other wall devices, including electrical and non-electrical devices and the cable or pipe configurations needed for the intended field of application. Annex C does the same for services in walls, including cable and pipe combinations. Annex D gives the ceiling configuration with a loadbearing test, including a ballast weight bar where the seal is tested without the device. Annex E covers floor installations and the related spacing and service rules.
What terms does prEN 1366-14 define?
Partial penetration seal - A system used to keep a separating element fire-resistant where one or more services or devices pass through one face only.
Partial penetration - An opening in one face of the separating element, including the service or device and seal, that does not pass through the full thickness.
Device - Electrical or mechanical equipment that penetrates one face of the separating element, often at the end of a service.
Supporting construction - The wall or floor construction that carries the partial penetration seal during the test.
Separation - The distance between the closest edges of two partial penetration seals on the same face of the construction.
Offset - The distance between the centre points of two partial penetration seals on opposite faces of the construction.
Back to back - Devices on both faces of a vertical construction with 200 mm or less separation in the plane of the wall.
Blank seal - A seal tested without the device, for the purpose of extending the field of application.
Who uses prEN 1366-14?
prEN 1366-14 is used by fire test laboratories, manufacturers of partial penetration seals, manufacturers of sockets, devices, cables, and service penetrations, and specifiers who need fire-resistance evidence for walls, floors, and ceilings. Quality managers and certification teams use it to define test specimens, set up direct application claims, and prepare test reports.
It is also relevant to buyers and engineers who need to compare products for use in electrical sockets, downlighters, media devices, cables, and other one-sided openings in building elements. In practice, it helps them decide what can be tested, how it should be installed during the test, and how far the results may be extended.
Which standards are used with prEN 1366-14?
prEN 1366-14 is used with EN 1363-1, which provides the general fire-resistance test requirements and the main procedures for furnace testing, temperature measurement, integrity assessment, and reporting. EN 1363-2 is used when alternative or additional procedures are needed.
EN ISO 13943 provides fire-safety vocabulary used in the document. The supporting construction may be based on EN 13381-1, EN 13381-2, EN 1364-1, EN 1364-2, EN 1365-1, EN 1365-2, or EN 1366-3, depending on whether the construction is a membrane, wall, or floor.
The annexes also refer to EN 60670-1 for electrical sockets, and Table A.1 identifies cable designations according to HD 603.3 and HD 604.5. These references matter because they define the actual devices and cables that may be built into the test specimen.
What does the prEN 1366-14 document contain?
The document contains the scope, normative references, terms and definitions, test equipment, test conditions, specimen requirements, installation rules, conditioning, instrumentation, procedure, performance criteria, test reporting, and direct application rules. It also contains annexes with standard configurations for walls, ceilings, and floors.
It includes figures for thermocouple positions and for the standard arrangements of sockets, devices, and services in walls, as well as a table of cable designations for the annex configurations. Annex D gives the loadbearing ceiling arrangement, and the annexes explain what can be varied in practice and what must stay as tested.
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Frequently Asked Questions
prEN 1366-14 is a draft published by the European Committee for Standardization (CEN). Its full title is "Fire resistance tests for service installations - Part 14: Partial penetration seals". This standard covers: This part of the EN 1366 series specifies a method of test and criteria for the evaluation (including field of direct application rules) of the ability of a partial penetration seal to maintain the fire resistance of a separating element at the position at which it has been penetrated by a device or devices that passes through one face of the element only. Partial penetration seals are used to seal apertures for electrical sockets, downlighters, media devices, cables and any item which requires an opening to be made in one face of the element of construction but does not include a device which passes through both faces. Supporting constructions are used in this part of the EN 1366 series to represent separating elements such as walls or floors. The supporting construction shall be a system that has been subject to a fire test in accordance with one of the following standards: EN 13381 1 for horizontal membranes, EN 13381 2 for vertical membranes, EN 1364 1 or EN 1365 1 for walls, EN 1366 3 for walls based on a standard supporting construction, or EN 1364 2 or EN 1365 2 for floors. This is referred to throughout this document as the applicable test standard for the supporting construction. This part of the EN 1366 series is used in conjunction with EN 1363 1. The purpose of a test described in this part of the EN 1366 series is to assess the integrity and insulation performance of the partial penetration seal, of the partially penetrating service(s) or device(s) and of the separating element in the surrounding area of the partial penetration seal. Where partial penetration seals are installed in loadbearing elements, it is possible that the loadbearing capacity is also considered. It is not the intention of this test to provide quantitative information on the rate of leakage of smoke and/or hot gases or on the transmission or generation of fumes. Tests in accordance with this part of the EN 1366 series are not intended to supply any information on the ability of the partial penetration seal to withstand stress caused by movements or displacements of the penetrating devices. The risk of spread of fire downwards cannot be assessed with this test. Tests in accordance with this part of the EN 1366 series do not address any risks associated with leakage of dangerous liquids or gases caused by failure of the device in case of fire.
This part of the EN 1366 series specifies a method of test and criteria for the evaluation (including field of direct application rules) of the ability of a partial penetration seal to maintain the fire resistance of a separating element at the position at which it has been penetrated by a device or devices that passes through one face of the element only. Partial penetration seals are used to seal apertures for electrical sockets, downlighters, media devices, cables and any item which requires an opening to be made in one face of the element of construction but does not include a device which passes through both faces. Supporting constructions are used in this part of the EN 1366 series to represent separating elements such as walls or floors. The supporting construction shall be a system that has been subject to a fire test in accordance with one of the following standards: EN 13381 1 for horizontal membranes, EN 13381 2 for vertical membranes, EN 1364 1 or EN 1365 1 for walls, EN 1366 3 for walls based on a standard supporting construction, or EN 1364 2 or EN 1365 2 for floors. This is referred to throughout this document as the applicable test standard for the supporting construction. This part of the EN 1366 series is used in conjunction with EN 1363 1. The purpose of a test described in this part of the EN 1366 series is to assess the integrity and insulation performance of the partial penetration seal, of the partially penetrating service(s) or device(s) and of the separating element in the surrounding area of the partial penetration seal. Where partial penetration seals are installed in loadbearing elements, it is possible that the loadbearing capacity is also considered. It is not the intention of this test to provide quantitative information on the rate of leakage of smoke and/or hot gases or on the transmission or generation of fumes. Tests in accordance with this part of the EN 1366 series are not intended to supply any information on the ability of the partial penetration seal to withstand stress caused by movements or displacements of the penetrating devices. The risk of spread of fire downwards cannot be assessed with this test. Tests in accordance with this part of the EN 1366 series do not address any risks associated with leakage of dangerous liquids or gases caused by failure of the device in case of fire.
prEN 1366-14 is classified under the following ICS (International Classification for Standards) categories: 13.220.50 - Fire-resistance of building materials and elements; 81.060.10 - Raw materials. The ICS classification helps identify the subject area and facilitates finding related standards.
prEN 1366-14 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2026
Preskusi požarne odpornosti servisnih inštalacij - 14. del: Delne tesnitve prebojev
Fire resistance tests for service installations - Part 14: Partial penetration seals
Feuerwiderstandsprüfungen für Installationen - Teil 14: Partielle Abschottungen
Essais de résistance au feu des installations techniques - Partie 14: Calfeutrements de
trémies partielles
Ta slovenski standard je istoveten z: prEN 1366-14
ICS:
13.220.50 Požarna odpornost Fire-resistance of building
gradbenih materialov in materials and elements
elementov
83.140.50 Tesnila Seals
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2026
ICS 13.220.50
English Version
Fire resistance tests for service installations - Part 14:
Partial penetration seals
Essais de résistance au feu des installations techniques Feuerwiderstandsprüfungen für Installationen - Teil
- Partie 14: Calfeutrements de trémies partielles 14: Partielle Abschottungen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 127.
If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC
Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1366-14:2026 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 6
4 Test equipment . 8
5 Test conditions . 8
5.1 Heating conditions . 8
5.2 Pressure conditions . 8
5.3 Loading conditions . 8
6 Test specimen . 8
6.1 Size and distances . 8
6.2 Number of test specimens . 9
7 Installation of test specimen . 9
7.1 General. 9
7.2 Supporting construction . 10
8 Conditioning . 10
9 Application of instrumentation . 10
9.1 General. 10
9.2 Thermocouples . 10
9.2.1 Furnace thermocouples . 10
9.2.2 Unexposed face thermocouples . 10
9.2.3 Roving thermocouple . 12
9.2.4 Additional thermocouples . 12
9.3 Integrity measurement . 12
10 Test procedure . 12
10.1 General. 12
10.2 Installation of test construction . 13
10.3 Measurements and observations . 13
11 Performance criteria . 13
11.1 Insulation . 13
11.1.1 Maximum temperature rise . 13
11.1.2 Average temperature rise . 13
11.2 Integrity . 13
11.3 Loadbearing capacity . 13
11.4 Expression of results . 13
12 Test report . 13
13 Field of direct application of test results . 14
13.1 Orientation . 14
13.2 Supporting construction . 14
13.3 Seal size . 14
13.4 Device depth . 14
13.5 Distances . 14
Annex A (normative) Partial penetration seals for electrical sockets in walls . 15
A.1 Standard configuration . 15
A.2 Direct field of application . 16
Annex B (normative) Partial penetration seals for devices other than electrical sockets in
walls . 18
B.1 Standard configuration . 18
B.2 Direct field of application . 18
Annex C (normative) Partial penetration seals for services in walls . 19
C.1 Standard configuration . 19
C.2 Direct field of application . 20
Annex D (normative) Partial penetration seals in ceilings with loadbearing test. 21
D.1 Standard configuration . 21
Annex E (normative) Partial penetration seals in floors . 22
E.1 Standard configuration . 22
E.2 Direct field of application . 22
Bibliography . 23
European foreword
This document (prEN 1366-14:2026) has been prepared by Technical Committee CEN/TC 127 “Fire
safety in buildings”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
EN 1366 ‘Fire resistance tests for device installations’ consists of the following Parts:
Part 1: Ducts;
Part 2: Fire dampers;
Part 3: Penetration seals;
Part 4: Linear joint seals;
Part 5: Device ducts and shafts;
Part 6: Raised access and hollow core floors;
Part 7: Conveyor systems and their closures;
Part 8: Smoke extraction ducts;
Part 9: Single compartment smoke extraction ducts;
Part 10: Smoke control dampers;
Part 11: Fire protection system for essential devices.
Introduction
This part of the EN 1366 series specifies a method of test and criteria for the evaluation (including field
of direct application rules) of the ability of a partial penetration seal to maintain the fire resistance of a
separating element at the position at which it has been penetrated by a device or devices that passes
through one face of the element only. Partial penetration seals are used to seal apertures for electrical
sockets, downlighters, media devices, cables and any item which requires an opening to be made in one
face of the element of construction but does not include a device which passes through both faces.
1 Scope
This part of the EN 1366 series specifies a method of test and criteria for the evaluation (including field
of direct application rules) of the ability of a partial penetration seal to maintain the fire resistance of a
separating element at the position at which it has been penetrated by a device or devices that passes
through one face of the element only. Partial penetration seals are used to seal apertures for electrical
sockets, downlighters, media devices, cables and any item which requires an opening to be made in one
face of the element of construction but does not include a device which passes through both faces.
Supporting constructions are used in this part of the EN 1366 series to represent separating elements
such as walls or floors. The supporting construction shall be a system that has been subject to a fire test
in accordance with one of the following standards: EN 13381-1 for horizontal membranes, EN 13381-2
for vertical membranes, EN 1364-1 or EN 1365-1 for walls, EN 1366-3 for walls based on a standard
supporting construction, or EN 1364-2 or EN 1365-2 for floors. This is referred to throughout this
document as the applicable test standard for the supporting construction.
This part of the EN 1366 series is used in conjunction with EN 1363-1.
The purpose of a test described in this part of the EN 1366 series is to assess the integrity and
insulation performance of the partial penetration seal, of the partially penetrating service(s) or
device(s) and of the separating element in the surrounding area of the partial penetration seal. Where
partial penetration seals are installed in loadbearing elements, it is possible that the loadbearing
capacity is also considered.
It is not the intention of this test to provide quantitative information on the rate of leakage of smoke
and/or hot gases or on the transmission or generation of fumes.
Tests in accordance with this part of the EN 1366 series are not intended to supply any information on
the ability of the partial penetration seal to withstand stress caused by movements or displacements of
the penetrating devices.
The risk of spread of fire downwards cannot be assessed with this test.
Tests in accordance with this part of the EN 1366 series do not address any risks associated with
leakage of dangerous liquids or gases caused by failure of the device in case of fire.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 1363-1, Fire resistance tests — Part 1: General requirements
EN 1363-2, Fire resistance tests — Part 2: Alternative and additional procedures
EN ISO 13943, Fire safety — Vocabulary
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 1363-1 and EN ISO 13943 and
the following apply.
3.1
back to back
devices installed on both faces of a vertical construction with a separation distance of 200 mm or less in
any direction (in the plane of the wall)
3.2
device
electrical or mechanical equipment which penetrates one face of the separating element, often at the
termination of a service
EXAMPLE Electrical socket or recessed media equipment.
3.3
flexible construction
horizontal or vertical supporting construction consisting of studs or joists, including linings and
optional insulation
3.4
offset
distance between the centres of two partial penetration seals in opposite faces of the element of
construction
3.5
partial penetration
aperture in one face of the separating element, including any service(s) or device(s) and associated seal,
that does not pass completely through the element
3.5.1
small partial penetration
partial penetration with an area of up to 0,025 m
3.5.2
medium partial penetration
2 2
partial penetration with an area greater than 0,025 m up to 0,12 m
3.5.3
large partial penetration
partial penetration with an area greater than 0,12 m
3.6
partial penetration seal
system used to maintain the fire resistance of a separating element at the position where one or more
services or devices pass through one face of a separating element
Note 1 to entry: These are sometimes referred to as “membrane penetrations”, “one-sided opening closures” or
“seals for one-sided outlets and installed components”.
3.7
separation
distance between the closest extremities of two partial penetration seals in the same face of the element
of construction
3.8
supporting construction
wall or floor construction used to support the partial penetration seal being evaluated
3.9
test specimen
assembly for the fire test consisting of the partial penetrating service(s) or device(s) and the partial
penetration seal materials or partial penetration seal devices
3.10
wall segment
section of a stud wall between adjacent studs
3.11
blank seal
seal is tested without the inclusion of a device for the purpose of generating field of application
EXAMPLE A hollow wall box including cable and blind cover, but without a switch or socket.
4 Test equipment
See EN 1363-1, and if applicable EN 1363-2.
5 Test conditions
5.1 Heating conditions
The heating and furnace atmosphere shall conform to those given in EN 1363-1 or, if applicable,
EN 1363-2.
5.2 Pressure conditions
Pressure conditions including tolerances shall be as given in the applicable test standard for the
supporting construction, subject to the following additional requirements:
Services shall only be included in the zone where the positive pressure exceeds 10 Pa (a minimum
pressure of 10 Pa shall be maintained at the lowest point of the lowest service, see Figure 7).
NOTE A pressure of 10 Pa is expected to be maintained ca. 1 200 mm below the plane where a pressure of
20 Pa is maintained in accordance with the pressure gradient given in EN 1363-1.
For horizontal supporting constructions a nominal pressure of 20 Pa shall be maintained in the
horizontal plane (100 ± 10) mm below the underside of the supporting construction.
5.3 Loading conditions
If the supporting construction is loadbearing, the test specimen shall be subjected to loads determined
in accordance with the applicable test standard for the supporting construction, which will refer back to
EN 1363-1. The determination of the load shall be clearly indicated in the test report.
6 Test specimen
6.1 Size and distances
The dimensions of the test specimen shall be in accordance with the applicable test standard for the
supporting construction.
In order to avoid boundary effects, the distance between the perimeter of the partial penetration seal
and the internal surfaces of the furnace or edges of the supporting construction shall be not less than
200 mm at any point.
Separation of partial penetration seals installed within the same face of a wall construction shall comply
with the following:
a) Partial penetration seals that are intended to be evaluated separately shall be separated by a
minimum 200 mm in any direction in the plane of the wall, unless the separation distance used in
practice is less, in which case the actual separation distance shall be used.
b) Partial penetration seals that are intended to be evaluated with interaction (evaluated for the effect
that other partial penetration seals may have on the performance of any given seal), shall be tested
with a separation of less than 200 mm (in any direction in the plane of the wall), unless the
separation distance used in practice is less. In each case the actual separation distance used shall be
the desired minimum separation.
c) The distances between partial penetration seals shall be recorded in the test report wherever this
is less than 200 mm (horizontally or vertically in the plane of the wall).
Separation of partial penetration seals installed within the opposite faces of a wall construction shall
comply with the following:
a) Partial penetration
...