Air Distribution Group Home | Air Distribution Group Members

Membership of the Air Distribution Group

Membership is open to any company or organization involved in the manufacture and supply of air distribution equipment

A list of member companies can be found by clicking the Members List

Members are also listed in the broader Directory of HEVAC companies.

The aim of the group

To represent and promote the UK air distribution industry. The membership can be relied upon to provide impartial guidance.

Current Documents

NEW – HEVAC request for clarification from MHCLG  on fire damper insulation - May 2021

There is some confusion in the marketplace as to the interpretation of the requirements in Approved Document B (ADB) (volumes 1 and 2) for Fire Dampers (EN15650, EN1366-2, EN13501-3 and EN15882-2) and Smoke Control Dampers (EN12101-8, EN1366-10, EN13501-4).  HEVAC requested clarification from the UK Government Department responsible for Building Regulations, MHCLG, and their response is in this download.


NEW – HEVAC Guidance on Fire Dampers and Smoke Control Dampers – Feb 2021


Air distribution products installation guidance - Aug 2019

Manufacturers of air distribution products including grilles, diffusers, other outlets, fire dampers and smoke control dampers provide essential guidance for their products to ensure that they will work, remain compliant, be safe and be secure during their expected operational lifetimes.
The guidance provides the purchaser/installer with clear details of product installation and on-going maintenance. This must be checked before mounting, then carefully followed and not ignored. Download.

Guide to Air Distribution Technology 2015Guide to Air Distribution Technology for the Internal Environment - March 2015

This booklet, first published in 2000 and revised in 2015, is intended as a guide to designers or contractors who install air diffusion equipment and is complementary to EN12238 - Air terminal devices - Aerodynamic testing and rating for mixed flow applications and EN12239 - Air terminal devices - Aerodynamic testing and rating for displacement flow applications.

The use of the guide early in the design stage will assist both designers and contractors in obtaining a satisfactory air distribution system. Download.

HEVAC General Specification and Product Directory for Air Distribution and Related Equipment (revised December 2010)

The Air Distribution Group of the HEVAC Association was formed by Members involved in the manufacture and supply of Air Distribution Equipment. The equipment offered by these member firms covers the whole range of grilles, diffusers, air terminal devices, louvres, terminal units, fan coil units, chilled beams and ceilings, duct dampers, smoke/fire dampers and ventilators. The equipment is manufactured to a high standard of quality and design to meet the stringent requirements of the H.V.A.C. Industry.

This publication can be downloaded here and consists of a General Specification and Members Product Directory covering the full range of products in some detail. The contents will be of considerable value to those involved with the selection of Air Distribution Equipment. Download.

HEVAC Installation Frame for Fire Dampers

Installation frame for fire dampers complying with the requirements of the Greater London Council. First published in 1983, revised in 2002 and again in 2012
HEVAC 6/5/83 rev 2 March 2012

Real Room Acoustic Test procedure

This code was written around 1986 by HEVAC members.  Alan Fry, chairman of the HEVAC Acoustics Group, was the principle author.  Download

Summary of standards for Air Distribution

BS 5925: 1991 Code of practice for ventilation principles and designing for natural ventilation

BS EN 1751: 2014 Ventilation for buildings -air terminal devices- aerodynamic testing of dampers and valves part1 aerodynamic testing

BS EN 12238: 2001 Ventilation for buildings -air terminal devices- aerodynamic testing and rating for mixed flow application

BS EN 12239: 2001 Ventilation for buildings -air terminal devices- aerodynamic testing and rating for displacement flow application

BS EN 12589: 2001 Ventilation for buildings -air terminal devices- aerodynamic testing and rating of constant and variable rate terminal units

BS EN 12599: 2012 Ventilation for buildings test procedures and measuring methods for handing over installed ventilation and air conditioning systems

BS EN 12792: 2003 Ventilation for buildings symbols terminology and graphical symbols

BS EN 130302001 Ventilation for buildings -terminals - performance testing of louvres subjected to simulated rain

BS EN 131812001 Ventilation for buildings -terminals - performance testing of louvres subjected to simulated sand

BS EN 131822002 Ventilation for buildings- instrumentation requirements for air velocity measurements in ventilated spaces

BS EN 132642001 Ventilation for buildings -floor mounted air terminal devices- tests structural classification

BS EN 142772006 Ventilation for buildings -air terminal devices- methods of airflow measurement by calibrated sensors in or close to ATD/plenum

BS EN 157262011 Ventilation for buildings-air diffusion-measurement in the occupied zone of air-conditioned /ventilated rooms to evaluate thermal and acoustic conditions

BS EN 162112015 Ventilation for buildings measurement of air flows on site

BS EN 164452013 Ventilation for buildings -air diffusion- aerodynamic testing and rating for mixed flow application; non-isothermal procedure for cold jet

BS EN ISO 72352009 Acoustics, laboratory measurement procedures for ducted silencers and air terminal units, insertion loss, flow noise and total pressure loss

BS EN ISO 77302005 Ergonomics of the thermal environment - analytical determination and interpretation of thermal comfort using calculation of PMV and PPD indices and local thermal comfort criteria

BS EN ISO 51351999 Determination of sound power levels of noise from air-terminal units, dampers and valves by measurement in a reverberant room

PD CR 17521999 Ventilation for buildings design criteria for the indoor environment

PD CEN/TS 171532018 Ventilation for buildings correction of air flow rate according to ambient conditions

Links to:

BSI on-line

BSI Shop

CEN standards search


For Information on Fire & Smoke Dampers

click here


If you have a question please email airdistribution @ and we will look to provide an answer to your query.


Last updated 08.03.2022