oSIST prEN 1506:2004

SLOVENSKI OSIST prEN 1506:2004

PREDSTANDARD
oct 2004
Ventilation for buildings - Sheet metal air ducts and fittings with circular cross-
section - Dimensions
ICS 91.140.30 Referenčna številka
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

EUROPEAN STANDARD
DRAFT
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2004
ICS  Will supersede EN 1506:1997
English version
Ventilation for buildings - Sheet metal air ducts and fittings with
circular cross-section - Dimensions
Ventilation des bâtiments - Conduits en tôle et accessoires
à section circulaire - Dimensions
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 156.

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 Management Centre has the same
status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.

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

Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2004 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1506:2004: E
worldwide for CEN national Members.

Contents Page
Foreword. 3
Introduction . 5
1 Scope. 6
2 Normative references . 6
3 Definitions and symbols. 6
4 Dimensions and values for ducts. 8
5 Dimensions for fittings. 9
6 Tolerances and clearances . 16
Annex A (informative) Examples of alternative designs of ends and connectors. 19
Bibliography . 21

Foreword
This document has been prepared by Technical Committee CEN/TC 156 "Ventilation for buildings",
the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 1442:1998.
This document has been prepared under a mandate given to CEN by the European Commission and
the European Free Trade Association, and supports essential requirements of EU Directive(s).
This standard is one of a series of standards for ductwork used for ventilation and air conditioning of
buildings for human occupancy, and it has a parallel standard referring to dimensions of rectangular
ducts.
The position of this standard in the field of mechanical building services is shown in Figure 1.
Mechanical Building Services
Control systems  Ventilation and air conditioning  Heating systems
systems
Air handling  Ductwork Installation
units
Circular Circular sheet  Rectangular sheet Hangers and
sheet metal metal ducts metal ducts Strength supports
ducts Strength and and leakage
Dimensions leakage
Rectangular Measurement of  Requirements for Flanges
sheet metal duct surface ductwork components
ducts. area to facilitate
Dimensions maintenance
Identification Flexible ducts  Determination of Ductwork
mechanical energy made of
loss insulation
ductboards
Figure 1 — Position of EN 1506 in the field of mechanical building services

Introduction
This revised standard has been prepared by CEN/TC 156 to specify standardized dimensions and
tolerances for ducts and duct fittings with circular cross-section, used in ventilation systems.
Dimensions and tolerances for straight ducts given in this standard are in accordance with
)
ISO 7807: 1983 concerning recommended sizes.
It is intended that the additional sizes (A) which are in use in some countries will be phased out and
may be removed from a future edition of the standard.
1)
The dimensions given for duct fittings are based on document EUROVENT 2/4

)
See annex B.
1 Scope
This European Standard specifies dimensions of ducts and duct fittings with circular cross- section. It
applies to ductwork used in ventilating and air conditioning systems in buildings, subject to human
occupancy. The wall thickness of ducts and fittings is not specified in this standard; strength and
leakage are dealt with in EN 12237.
The corresponding Standard for rectangular ducts is EN 1505.
2 Normative references
The following referenced documents are indispensable for the application 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 12792, Ventilation for buildings — Symbols and terminology
EN 1505, Ventilation for buildings — Sheet metal air ducts and fittings with rectangular cross-section
— Dimensions
EN 12237, Ventilation for buildings — Strength and leakage of sheet metal air ducts with circular
cross-section — Requirements and testing
3 Definitions and symbols
For the purposes of this standard, the definitions given in European Technical Report EN 12792,
together with the following, apply.
3.1
nominal size (d, d , d , d and d )
1 2 3 4
reference dimension used for designation, calculation and application of ducts and fittings
d denotes the inner diameter of ducts and female ends.
d , d , d and d denote the inner diameters of male ends of fittings.
1 2 3 4
3.2
effective length of a fitting (1, 1 , and 1 )
1 3
length by which a fitting contributes to the overall length of the air distribution system
3.3
effective length of a straight duct (L)
length which a straight duct contributes to the overall length of the air distribution system
3.4
overlap (insertion) length (l )
p
length which a fitting overlaps the duct
3.5
cross-sectional area (A )
c
for ducts with circular cross-section the cross-sectional area A is equal to
c
πd
A =
c
3.6
straight duct surface area (A )
i
product of the internal perimeter and the duct length
For ducts with circular cross-section the duct surface area per metre length is
A = πd
i
3.7 Deviation, tolerance, clearance (see Figure 10)
3.7.1
upper deviation
algebraic difference between the maximum limit of size and the corresponding nominal size
3.7.2
lower deviation
algebraic difference between the minimum limit of size and the corresponding nominal size
3.7.3
tolerance
difference between the upper deviation and the lower deviation. The tolerance is an absolute value
without sign
3.7.4
clearance
positive difference between the sizes of a female connector or duct and of a male connector
4 Dimensions and values for ducts
The nominal diameter d, cross-sectional area A and duct surface area A are given in Table 1. The
c i
nominal diameters also apply to fittings. Tolerances, deviations and clearances are given in clause 6.

Table 1 — Ducts with circular cross-section: dimensions
Nominal diameter, Cross-sectional Duct surface area, A
i
d mm area, A m /m
1 c
m
Recommended sizes
-3
63 0,197
3,12 × 10
-3
80 0,251
5,03 × 10
-3
100 0,314
7,85 × 10
-3
125 0,393
12,3 × 10
-3
160 20,1 × 10 0,502
-3
200 0,628
31,4 × 10
-3
250 0,785
49,1 × 10
-3
315 0,990
77,9 × 10
400 0,126 1,26
500 0,196 1,57
630 0,312 1,98
800 0,503 2,51
1000 0,785 3,14
1250 1,23
...