ASTM_E_1998_-_11.pdf

Designation:E199811Standard Guide forAssessing Depressurization-Induced Backdrafting andSpillage from Vented Combustion Appliances1This standard is issued under the fixed designation E1998;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This guide describes and compares different methods forassessing the potential for,or existence of,depressurization-induced backdrafting and spillage from vented residentialcombustion appliances.1.2 Assessment of depressurization-induced backdraftingand spillage is conducted under either induced depressurizationor natural conditions.1.3 Residential vented combustion appliances addressed inthis guide include hot water heaters and furnace.The guide alsois applicable to boilers.1.4 The methods given in this guide are applicable toCategory I(draft-hood-and induced-fan-equipped)furnaces.The guide does not apply to Category III(power-vent-equipped)or Category IV(direct-vent)furnaces.1.5 The methods in this guide are not intended to identifybackdrafting or spillage due to vent blockage or heat-exchanger leakage.1.6 This guide is not intended to provide a basis fordetermining compliance with code requirements on applianceand venting installation,but does include a visual assessmentof the installation.This assessment may indicate the need for athorough inspection by a qualified technician.1.7 Users of the methods in this guide should be familiarwith combustion appliance operation and with making house-tightness measurements using a blower door.Some methodsdescribed in this guide require familiarity with differential-pressure measurements and use of computer-based data-logging equipment.1.8 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.9 This guide does not purport to address all safetyconcerns,if any,associated with its use.It is the responsibilityof the user to establish appropriate safety and health practicesand to determine the applicability of regulatory limitationsprior to use.Carbon monoxide(CO)exposure or flame roll-outmay occur when performing certain procedures given in thisguide.See Section 7,for precautions that must be taken inconducting such procedures.2.Referenced Documents2.1 ASTM Standards:2D1356 Terminology Relating to Sampling and Analysis ofAtmospheresE631 Terminology of Building ConstructionsE779 Test Method for DeterminingAir Leakage Rate by FanPressurization2.2 CAN/CGSB Standards:3CAN/CGSB 51.71 The Spillage TestMethod to Determinethe Potential for Pressure-Induced Spillage from Vented,Fuel-Fired;Space HeatingAppliances;Water Heaters,andFireplaces2.3 ANSI Standards:4ANSI Z21.47 Gas-fired Central Furnace2.4 NFPA Standards:5NFPA 54 National Fuel Gas Code3.Terminology3.1 Definitions:3.1.1 For definitions of general terms related to buildingconstruction used in this specification,refer to TerminologyE631,and for general terms related to sampling and analysis ofatmospheres,refer to Terminology D1356.1This guide is under the jurisdiction of ASTM Committee E06 on Performanceof Buildings and is the direct responsibility of Subcommittee E06.41 on AirLeakage and Ventilation Performance.Current edition approved Sept.1,2011.Published October 2011.Originallyapproved in 1999.Last previous edition approved in 2007 as E1998 02(2007).DOI:10.1520/E1998-11.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3Available from Canadian General Standards Board(CGSB),Sales Center,Place du Portage III,6B1,11 Laurier Street,Gatineau,Quebec K1A 1G6,Canada,http:/www.tpsgc-pwgsc.gc.ca/ongc-cgsb/cn-cu-eng.html.4Available from American National Standards Institute(ANSI),25 W.43rd St.,4th Floor,New York,NY 10036,http:/www.ansi.org.5Available from National Fire Protection Association(NFPA),1 BatterymarchPark,Quincy,MA 02169-7471,http:/www.nfpa.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2 Definitions of Terms Specific to This Standard:3.2.1 air leakage,nthe movement or flow of air throughthe building envelope which is driven by a pressure differentialacross the envelope.3.2.2 air leakage rate,nthe volume of air movement perunit time across the building envelope.3.2.3 airtightness,nthe degree to which the buildingenvelope resists flow of air.3.2.4 blower door,na fan pressurization device incorpo-rating a controllable fan and instruments for airflow measure-ment and building pressure difference measurement thatmounts securely in a door or other opening.3.2.5 Category 1 appliance,nan appliance that operateswith non-positive