EUROVENT 2/3 - Second edition 1996 - Sheet metal air ducts standard for dimensions

Oct 13, 2026

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EUROVENT 2/3-1996 provides recommendations for the dimensions of sheet metal air ducts with circular and rectangular cross sections. It aligns the standardized duct dimensions with relevant European Standards expected for publication in 1997. Besides dimensioning step factors, it includes diagrams to support practical design use. Key duct parameters are defined, including nominal size, effective length, cross-sectional area, surface area, aspect ratio, hydraulic and equivalent diameters, tolerance, and connection clearance.

LanguageEnglish

CategoryGeneral

FormatPDF

Pages24

Reading Time8 min

AccessFree to download

Contents

1. Definitions

2. Standardisation of duct dimensions

3. Basis of the standard

4. Standardised dimensions and data

5. Selection of ducts

6. Tolerances and clearance

7. Tables and figure

EUROVENT 2/3-1996 | SHEET METAL AIR DUCTS
STANDARD FOR DIMENSIONS | | --- | EUROVENT 2/3-1996 | SHEET METAL AIR DUCTS
STANDARD FOR DIMENSIONS | | --- | EUROVENT 2/3 Second edition 1996 | Published by EUROVENT/CECOMAF
15 rue Montorgueil
F-75001 PARIS
Tel 33140260085
Fax 33140260126 | | --- | FOREWORD The present document gives recommendations on dimensions of ducts with circular andrectangular cross sections.The previous edition published in 1993 based on vaniousnational,manufacturers or contractor standards was used as a basic document for thepreparation of the European Standards in the CEN/TC 156.The relevant EuropeanStandards: -pr EN 1505:Sheet metal air ducts and fittings with rectangular cross section -pr EN 1506:Sheet metal air ducts and fittings with circular cross section are expected to be published in 1997. This second edition of the EUROVENT 2/3 is in full accordance with these EuropeanStandards. In addition to the standardised dimensions the fundamental factors affecting the choice ofdimension steps and a number of diagrams intended to facilitate the use of standardisedduct dimensions in practical design work are presented. Dimensions of fittings are given in the EUROVENT 2/4. CONTENTS 1.DEFINITION………………………………………………………………………………………………………………………………………………………3 1.1-NOMINAL SIZE………………………………………………………………………………………………………………………………………………………3 1.2-EFFECTIVE LENGTHL……………………………………………………………………………………………………………………………3 1.3-CROSS-SECTIONAL AREA Ac……………………………………………………………………………………………………………………3 1.4-DUCT SURFACE AREA A………………………………………………………………………………………………………………………………3 1.5-ASPECT RATIO FOR DUCTS WITH RECTANGULAR CROSS-SECTIONK…………………………………5 1.6-HYDRAULIC DIAMETER D………………………………………………………………………………………………………………………5 1.7-EQUIVALENT DIAMETER D……………………………………………………………………………………………………………………5 1.8- TOLERANCE………………………………………………………………………………………………………………………………………………6 1.9-CLEARANCE(FOR DUCT CONNECTIONs)…………………………………………………………………………………………………6 2.STANDARDISATION OF DUCT DIMENSION……………………………………………………………………………………………6 3.BASIS OF THE STANDARD…………………………………………………………………………………………………………………………7 3.1-STANDARD FOR DIMENSIONING OF DUCTS WITH CIRCULAR CROSS-SECTION………………7 3.2-STANDARD FOR DIMENSIONING OF DUCTS WITH RECTANGULAR CROSS-SECTION…8 4.STANDARDISED DIMENSIONS AND DATA………………………………………………………………………………………………9 4.1-STANDARDISED DIMENSIONS AND DATA FOR DUCTS WITH CIRCULAR CROSS- SECTION……………………………………………………………………………………………………………………………………………………………9 5.SELECTION OF DUCTS………………………………………………………………………………………………………………………………10 6.TOLERANCES AND CLEARANCE………………………………………………………………………………………………………………10 6.1-TOLERANCES FOR DUCTS WITH CIRCULAR CROSS-SECTION………………………………………………10 6.2-CLEARANCE FOR DUCTS WITH CIRCULAR CROSS-SECTION………………………………………………10 6.3- TOLERANCES FOR DUCTS WITH RECTANGULAR CROSS-SECTION……………………………………10 7.TABLES AND FIGURE. ………………………………………………………………………………………1 # 1.DEFINITIONS ## 1.1-NOMINAL SIZE The nominal size is the reference dimension used for the purpose of designation,calculation and application of ducts. For practical purposes the nominal size is given in mm. For ducts with circular cross-section the nominal size d is the internal diameter of the duct. For ducts with rectangular cross-section the nominal size is the internal dimension of theduct. There are two dimensions a and b: a=the long side of the duct b=the short side of the duct ## 1.2-EFFECTIVE LENGTH L Length by which the duct contributes to the length of the air distribution system. ## 1.3-CROSS-SECTIONAL AREA Ac For ducts with circular cross-section the cross-sectional area Ae is equal to:.10⁶(m²) For ducts with rectangular cross-section the cross-sectional area A。is equal to:Ac=ab.10⁶(m²) ## 1.4-DUCT SURFACE AREA A; Duct surface area Ai is the product of the intenal perimeter and the duct length.For ducts with circular cross-section the duct surface area per meter length is:A₁=πd.10³

FAQs

What does the document cover regarding duct dimensions?

It provides recommendations for dimensions of sheet metal ducts with circular and rectangular cross sections, including the parameters needed for designation, calculation, and practical design.

How are nominal size values defined for circular and rectangular ducts?

For circular ducts, nominal size d is the internal diameter. For rectangular ducts, the nominal size is the internal dimensions with long side a and short side b.

What is meant by clearance for duct connections?

Clearance is the actual dimensional difference between the sizes of a female connector (or duct) and a male connector, as described with reference to the document figure.

Oct 13, 2026

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