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Building Engineering Services Association Guide to good practice:Low EnErgyVEntiLation forrEsidEntiaL BuiLdings TR/35 www.theBESA.com

Building Engineering Services AssociationGuide to good practice: AcknowledgmentsLow EnErgy Members of the drafting panel who compiled this guide.VEntiLation for BEsa wishes to record its sincere thanks to the following,rEsidEntiaL without whose direct input of knowledge, time andBuiLdings experience this publication would not have been produced. TR/35 alan todd Chris Marriott david fitzpatrick ian Mitchell Joe fletcher neil Chester terry Payne alan Keating – secretary Chris Parsloe – Consultant the above are either BEsa members or representatives from the industry. BEsa also wishes to acknowledge the input from BEaMa, Bsria, CiBsE, fEta, together with the members of the technical committee for their time, input and vetting. this publication is printed on revive 50:50 silk paper, which is certified by the forest stewardship council (fsc) as a mixed source grade containing 50% recovered waste and 50% virgin fibre isBn 978-0-903783-62-0 first issued 2011 ©2013 BEsa BESA Publications old Mansion House Eamont Bridge Penrith Ca10 2BX 01768 860405 [email protected]. www.theBESA.com

Building Engineering Services AssociationGuide to good practice: ForewordLow EnErgy the government’s commitment to reduce energy consumptionVEntiLation for and carbon emissions requires buildings to be more airtight andrEsidEntiaL more energy efficient. air tightness is now measurable and definedBuiLdings in Part l of the building regulations. the developments in Part f reflect these changes, accounting for the requirements to ventilate efficiently for TR/36 human comfort and health, whilst using proven technology such as low energy ventilation, which is now becoming an increasingly important design strategy for residential buildings. Building regulations are increasingly focussing on lowering energy use as well as maintaining indoor air quality. low energy ventilation is one of several design strategies used by professionals designing more sustainable and environmentally friendly buildings. the key to successful implementation of a low energy ventilation strategy is to consider its application during preliminary stages of project design. decisions about building plan, orientation, building mass and glazing types along with other factors will enable the most effective use to be made of low energy ventilation. the guide is intended to be part of a suite of publications covering installation requirements for a range of energy efficient systems. it draws on the wide range of existing BEsa publications covering good practice in building engineering systems and should be read in conjunction with the wider range of ductwork installation guides available for ventilation systems. this standard is not intended to override any other client’s specifications and where new products or technologies are used, full supporting manufacturer’s information shall be available if required. Paul Hancock Chairman BEsa technical committee www.theBESA.com

Building Engineering services association 5guidE to good PracticE Low EnErgy VEntiLation for rEsidEntiaL BuiLdingscontEnts1 introduction Page 72 Legislative requirements Page 83 terminology Page 9 3.1 ventilators Page 104 Ventilation system options Page 114.1 intermittent mechanical extractventilation (MEv) Page 114.1.1 installation considerations forintermittent MEv systems Page 124.2 continuous mechanical extractsystems (MEv) Page 134.2.1 installation considerations forcontinuous MEv systems Page 144.3 Passive stack ventilation (PSv) Page 154.3.1 installation considerations forPSv systems Page 154.4 continuous mechanical ventilationwith heat recovery(MvHR) Page 174.4.1 installation considerations forMvHR systems Page 194.5 Positive input ventilation (Piv) Page 194.5.1 installation considerations forPiv systems Page 205 ductwork Page 216 commissioning Page 237 Bibliography and sources Page 257.1 References Page 257.2 BESA Publications Page 257.3 Applicable standards and regulations Page 25