bs 1505 ventilation

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BRITISH STANDARD BS EN1505:1998

The European Standard EN 1505:1997 has the status of aBritish Standard

ICS 91.140.30

NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW

Ventilation for buildings ÐSheet metal air ducts andfittings with rectangularcross-section Ð Dimensions

This British Standard, havingbeen prepared under thedirection of the EngineeringSector Board, was publishedunder the authority of theStandards Board and comes intoeffect on 15 April 1998

BSI 1998

ISBN 0 580 29025 5

BS EN 1505:1998

Amendments issued since publication

Amd. No. Date Text affected

National foreword

This British Standard is the English language version of EN 1505:1997 published bythe European Committee for Standardization (CEN).

The UK participation in its preparation was entrusted to Technical CommitteeRHE/2, Air distribution and air diffusion, which has the responsibility to:

± aid enquirers to understand the text;

± present to the responsible European committee any enquiries on theinterpretation, or proposals for change, and keep the UK interests informed;

± monitor related international and European developments and promulgatethem in the UK.

A list of organizations represented on this committee can be obtained on request toits secretary.

Cross-references

The British Standards which implement international or European publicationsreferred to in this document may be found in the BSI Standards Catalogue under thesection entitled ªInternational Standards Correspondence Indexº, or by using theªFindº facility of the BSI Standards Electronic Catalogue.

A British Standard does not purport to include all the necessary provisions of acontract. Users of British Standards are responsible for their correct application.

Compliance with a British Standard does not of itself confer immunityfrom legal obligations.

Summary of pages

This document comprises a front cover, an inside front cover, the EN title page,pages 2 to 10, an inside back cover and a back cover.

CENEuropean Committee for Standardization

ComiteÂ EuropeÂen de Normalisation

EuropaÈisches Komitee fuÈ r Normung

Central Secretariat: rue de Stassart 36, B-1050 Brussels

1997 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN nationalMembers.

Ref. No. EN 1505:1997 E

EUROPEAN STANDARD EN 1505

NORME EUROPEÂ ENNE

EUROPAÈ ISCHE NORM December 1997

ICS 91.140.30

Descriptors: Buildings, ventilation, air conditioning, aeraulic pipes, accessories, rectangular form, metal plates, definitions, dimensions,dimensional tolerances

English version

Ventilation for buildings Ð Sheet metal air ducts and fittings withrectangular cross-section Ð Dimensions

Ventilation des baÃtiments Ð Conduits en toÃ le etaccessoires aÁ section rectangulaire Ð Dimensions

LuÈftung von GebaÈuden Ð Luftleitungen undFormstuÈcke aus Blech mit Rechteckquerschnitt ÐMaûe

This European Standard was approved by CEN on 25 October 1997.

CEN members are bound to comply with the CEN/CENELEC Internal Regulationswhich stipulate the conditions for giving this European Standard the status of anational standard without any alteration. Up-to-date lists and bibliographicalreferences concerning such national standards may be obtained on application tothe Central Secretariat or to any CEN member.

This European Standard exists in three official versions (English, French, German).A version in any other language made by translation under the responsibility of aCEN member into its own language and notified to the Central Secretariat has thesame status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy,Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland andUnited Kingdom.

EN 1505:1997

BSI 1998

Figure 1 Ð Position of EN 1505 in the field of mechanical building services

Foreword

This European Standard has been prepared byTechnical Committee CEN/TC 156, Ventilation forbuildings, the secretariat of which is held by BSI.

This standard is one of a series of standards forductwork used for ventilation and air conditioning ofbuildings for human occupancy, and it has a parallelstandard referring to dimensions of ducts with circularcross-section.

The position of this standard in the field of mechanicalbuilding services is shown in Figure 1.

This European Standard shall be given the status of anational standard, either by publication of an identicaltext or by endorsement, at the latest by June 1998, andconflicting national standards shall be withdrawn atthe latest by June 1998.

According to the CEN/CENELEC Internal Regulations,the national standards organizations of the followingcountries are bound to implement this EuropeanStandard: Austria, Belgium, Czech Republic, Denmark,Finland, France, Germany, Greece, Iceland, Ireland,Italy, Luxembourg, Netherlands, Norway, Portugal,Spain, Sweden, Switzerland and the United Kingdom.

EN 1505:1997

BSI 1998

Contents

Page

Foreword 2

Introduction 4

1 Scope 4

2 Normative references 4

3 Definitions and symbols 4

4 Dimensions and values for ducts 5

5 Dimensions for fittings 6

6 Tolerances and deviations 8

Annex A (informative) Examples ofalternative designs of connections 9

Annex B (informative) Comments and notesto clause 5 9

Annex C (informative) Bibliography 10

EN 1505:1997

BSI 1998

Figure 2 Ð Application of denominations for the nominal size

1) See annex C.

IntroductionThis standard has been prepared by CEN/TC 156 tospecify dimensions and tolerances for rectangularducts and duct fittings used in ventilation systems.

Dimension and tolerances for straight ducts given inthis standard are in accordance with ISO 7807:19831)

concerning recommended sizes.

The dimensions given for duct fittings are based ondocument EUROVENT 2/41).

1 ScopeThis European Standard specifies dimensions of sheetmetal air ducts and duct fittings with rectangularcross-section. It applies to ductwork used in ventilationand air conditioning systems in buildings subject tohuman occupancy. The wall thickness of ducts andfittings is not specified in this standard; strength andleakage are dealt with in prEN 1507.

The corresponding standard for circular ducts isEN 1506.

2 Normative referencesThis European Standard incorporates by dated orundated reference, provisions from other publications.These normative references are cited at theappropriate places in the text and the publications arelisted hereafter. For dated references the subsequentamendments to or revisions of any of thesepublications apply to this European Standard onlywhen incorporated in it by amendment or revision. Forundated references the latest edition of the publicationreferred to applies.

CR 12792, Ventilation for buildings Ð Symbols andterminologyEN 1506, Ventilation for buildings Ð Ductwork.Circular sheet metal air ducts and duct fittings ÐDimensionsprEN 1507, Ventilation for buildings Ð Ductwork ÐRectangular sheet metal air ducts Ð Strength andleakage Ð Requirements and testing

3 Definitions and symbolsFor the purposes of this standard, the definitions givenin CR 12792, together with the following, apply.

3.1

nominal size

reference dimension used for designation, calculationand application of ducts and fittings. For ducts, thenominal size is the internal dimension of side a andside b, where a is the visible side (see Figure 2). Thelengths of the sides of the smaller end of atransformation piece are denoted by c and d, where c isthe visible side (see Figure 2)

3.2

effective length of fitting (l)length by which a fitting contributes to the overalllength of the air distribution system

3.3

effective length of a straight duct (L)

length by which a straight duct contributes to theoverall length of the air distribution system

3.4

cross-sectional area (Ac)

product of the side lengths a and b

3.5

duct surface area (Ai)

product of the internal perimeter and the duct length

3.6hydraulic diameter (dh)

for a rectangular duct, the diameter of a circular ductwhich will cause the same pressure drop at equal airvelocity and equal friction coefficients

dh = =4 (cross-sectional area)

internal perimeter

2 aba + b

3.7equivalent diameter (de)

for a rectangular duct, the diameter of a circular ductwhich will cause the same pressure drop at equal airflow and equal friction coefficients

3.8angle of a transformation piece (a)

the larger angle between two opposite sides of atransformation piece

EN 1505:1997

BSI 1998

Table 1 Ð Dimensions and values for ducts

Sidelengths

mm

100 150 200 250 300 400 500 600 800 1000 1200

200 0,020 0,030 0,040 Ac

133 171 200 dh

149 186 218 dc

0,60 0,70 0,80 Ai

250 0,025 0,038 0,050 0,063 Ac

143 188 222 250 dh

165 206 241 273 dc

0,70 0,80 0,90 1,00 Ai

300 0,030 0,045 0,060 0,075 0,090 Ac

150 200 240 273 300 dh

180 224 262 296 327 dc

0,30 0,90 1,00 1,10 1,20 Ai

400 0,040 0,060 0,080 0,10 0,12 0,16 Ac

160 218 267 308 343 400 dh

205 255 299 337 373 436 de

1,00 1,10 1,20 1,30 1,40 1,60 Ai

500 0,075 0,10 0,13 0,15 0,20 0,25 Ac

231 286 333 375 444 500 dh

283 331 374 413 483 545 de

1,30 1,40 1,50 0,60 1,80 2,00 Ai

600 0,090 0,12 0,15 0,18 0,24 0,30 0,36 Ac

240 300 353 400 480 545 600 dh

307 359 406 448 524 592 654 de

1,50 1,60 1,70 1,80 2,00 2,20 2,40 Ai

800 0,16 0,20 0,24 0,32 0,40 0,48 0,64 Ac

320 381 436 533 615 686 800 dh

410 463 511 598 675 745 872 de

2,00 2,10 2,20 2,40 2,60 2,80 3,20 Ai

3.9 Deviation, tolerance

3.9.1

upper deviation

algebraic difference between the maximum limit of sizeand the corresponding nominal size

3.9.2

lower deviation

algebraic difference between the minimum limit of sizeand the corresponding nominal size

3.9.3

tolerance

difference between the upper deviation and the lowerdeviation. The tolerance is an absolute value withoutsign

4 Dimensions and values for ductsThe dimensions for ducts, including the correspondingvalues of cross-sectional area (Ac in m2), hydraulicdiameter (dh in mm), equivalent diameter (de in mm)and duct surface area per metre length (Ai in m2/m),are given in Table 1.

The equivalent diameter de is calculated using thefollowing formula:

de = 2b(π22n (1 + a/b)1+n/(a/b)3)1/(n25)

where

n = 1/(1,05 logRe2 0,45)

Tolerances and deviations are given in clause 6.

EN 1505:1997

BSI 1998

Table 1 Ð Dimensions and values for ducts (continued)

Sidelengths

mm

100 150 200 250 300 400 500 600 800 1000 1200

1000 0,25 0,30 0,40 0,50 0,60 0,80 1,00 Ac

400 462 571 667 750 889 1000 dh

512 566 662 747 825 965 1090 de

2,50 2,60 2,80 3,00 3,20 3,60 4,00 Ai

1200 0,36 0,48 0,60 0,72 0,96 1,20 1,44 Ac

480 600 706 800 960 1091 1200 dh

614 719 812 896 1049 1184 1308 de

3,00 3,20 3,40 3,60 4,00 4,40 4,80 Ai

1400 0,56 0,70 0,84 1,12 1,40 1,68 Ac

622 737 840 1018 1167 1292 dh

771 871 962 1125 1270 1403 de

3,60 3,80 4,00 4,40 4,80 5,20 Ai

1600 0,64 0,80 0,96 1,28 1,60 1,92 Ac

640 762 873 1067 1231 1371 dh

819 925 1022 1195 1350 1491 de

4,00 4,20 4,40 4,80 5,20 5,60 Ai

1800 0,90 1,08 1,44 1,80 2,16 Ac

783 900 1108 1286 1440 dh

976 1078 1261 1424 1573 de

4,60 4,80 5,20 5,60 6,00 Ai

2000 1,00 1,20 1,60 2,00 2,40 Ac

800 923 1143 1333 1500 dh

1024 1131 1323 1494 1650 de

5,00 5,20 5,60 6,00 6,40 Ai

5 Dimensions for fittings

5.1 Bends

Examples of bends are shown in Figure 3.

In order to reduce the pressure loss, bends of largerdimensions may be provided with splitters. Examplesof designing and positioning of splitters are given inannex B.

5.2 Branches

Examples of branches are shown in Figure 4. Thedimensions r and f are given in Table 2.

Table 2 Ð Minimum dimensions of r and f

Dimensions in millimetres

Branch duct of widtha

r f

a < 200 $ 100 $ 100

200 < a# 300 $ 100 $ 100

300 < a# 400 $ 150 $ 125

400 < a# 600 $ 150 $ 150

a > 600 $ 150 $ 200

5.3 Transformation pieces

Examples of transformation pieces are shown inFigures 5 to 7. For connections between rectangularand circular ducts see also EN 1506.

EN 1505:1997

BSI 1998

a) b) c)

908 bend 908 transformation bend

e $ 25 mmr $ 100 mmr $ 100 mml = 0,5 a + r + e

e1 and e2 $ 25 mmr $ 100 mmry + c + ril1 = 0,5 c + ri + e1l2 = 0,5 c + ri + e2

d) e) f)

bends, a # 908

e $ 25 mmri $ 100 mml = (0,5 a + r) tana/2 + e

Figure 3 Ð Examples of bends

a) b)

Figure 4 Ð Branch mounted on the side wall of a duct

EN 1505:1997

BSI 1998

a) concentric b) eccentric

Figure 5 Ð Transformation between ducts with rectangular cross-section

a) concentric b) eccentric

Figure 6 Ð Transformation between one duct with rectangular, and one withcircular cross-section

Figure 7 Ð Branch with circularcross-section as a transformation piece to

a duct with rectangular cross-section

6 Tolerances and deviationsThe tolerance of the length L of a straight ductis 0,005 L.

The tolerance of angles is 28.

The deviation of a, b, c, d, e, f is mm240

The deviation l, lp and r is given in Table 3.

Table 3 Ð Deviation of l, lp and r

Dimensions in millimetres

l, lpr Deviation

# 15 0

22

> 15 0

# 100 25

> 100 2 0

210

EN 1505:1997

BSI 1998

Annex A (informative)

Examples of alternative designs of connections

a) Rolled steel angle flanged jointswith welded corners

b) Rolled steel flat flanged joint withwelded corners

c) Reinforced flange cleat with C-cleat d) Slide on flange

e) Slide on flange f) Integral standing flanged with C-cleat

g) Standing flange with double rubbergasket and C-cleat

h) Standing flange with single rubbergasket and C-cleat

Figure A.1 Ð Examples of alternative designs of connections

Annex B (informative)

Comments and notes to clause 5

B.1 General

It is recommended that splitters are positioned inaccordance with the examples given in Table B.1.Designers should take account of individual systemrequirements regarding acoustics, velocity and pressurewhen selecting duct fittings.

NOTE 1 The bend shown in Figure 3a) is only recommended foruse on low pressure/velocity systems and smaller dimensions ofducts.

NOTE 2 For bends shown in Figures 3b) and 3c), with radius rless than 100 mm, splitters are recommended in accordance withTable B.1 and Figure B.1. If alternatively r is increased to 0,5asplitters may be omitted.

NOTE 3 For bends shown in Figures 3d), 3e) and 3f), with angles# 458, splitters are not required but for angles > 458, splitters arerecommended.

NOTE 4 For transformation pieces, as shown on Figures 5 and 6,which are large or are used on high velocity systems the slopeangle a should be reduced.

Table B.1 Ð Positioning of splitters

Duct width a Number ofsplitters

Distance betweensplitters

mm (approximate)

mm a1 a2 a3

> 400# 800 1 a/3

> 800# 1600 2 a/4 a/2

> 1600# 2000 3 a/8 a/3 a/2

EN 1505:1997

BSI 1998

Figure B.1 Ð Positioning of splitters

Annex C (informative)

BibliographyThe following documents are referred to in theintroduction.

ISO 7807, Air distribution Ð Straight circular sheetmetal ducts with a lock type spiral seam and straightrectangular sheet metal ducts Ð Dimensions

EUROVENT 2/4, Sheet metal air ducts Ð Standard forfittings

BSI389 Chiswick High RoadLondonW4 4AL

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