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Washington State amendm?nts <br /> 403.�.6.4 Wf�ole house exhaust and transfer fans. thermal shock to the heat eYchanger.At a minimum, <br /> E�aust fan construction and sizin�shall meet the follo�vin; filtration of the outdoar air shall be provided at the forced- <br /> criteria. . air unit.The filter shall be accessible for regular <br /> 1. E�laust and transfer fans shall be tested and rated in maintenance and replacement.The filter shall have a <br /> accordance with the airflow and sound rating Minimum Efficiency Ratin;Value(MERV)of at least 6. <br /> procedures of the Hotne Ventilating Institute(HVI 403.�.�Whole ho�ise ventilatian e�ith supply f�n�ystems. <br /> 915,HVI Loudness Testing and Ratin�Procediu�e, This section establishes minimum requirements for <br /> HVI 916,HVI Airflow Test Procedure,and HVI 920, mechanical�vhole house ventilation systems usin�supply <br /> HVI Product Performance Certification Procedure). fan systems. <br /> 2. Installation of system or equipment shall be carried 403.�.�.1 Outc➢oor air. Supply fan ventilation systems shall <br /> out in accordance with manufacturers'desi�n provide outdoor air throu�h one of the following m�thods: <br /> requirements and installation instructions. 1.A dedicated outdoor air loiiver and outdoor air duct for <br /> 3. Fan airflow rating and duct system shall be designed each d�velling unit or sleeping unit shall supply <br /> ancl installed to deliver at least the outdoor au-florv outdoor air to a supply fan; or <br /> requu�ed by Table 403.3 or Table 403.8.1.The 2.A central otitdoor�ir supply fan system shall distribute <br /> airflows required refer to the cielivered airflow of the unconditioned or conditioned air to multiple dwellin; <br /> system as installed ancl tested usin�a flow hood, flow uni'ts or sleepin�tmits. <br /> grid, or other airflow measurement device. <br /> �03.�.�.� �'Vhale hoa��e s��pply�y�t�rn. �Ihere outdoor air <br /> �XCEP`TION: An airflo�v i•ating at a pressure of is provided to each habitable drvelling unit or sleepin��init <br /> 0.25 in.w.g.may be tised,provided the duct sizin� by supply fan systems the otrtdoor air shall be filtered. <br /> meets the prescriptive requirements of Table <br /> 403.8.5.2. The system filter may be located at the intake device or <br /> �d03.8.6.5 Fan noise. Whole house e�aust and transfer fans inline with the fan.The filter shall be accessible for regular <br /> maintenance and replacement. The filter shall have a <br /> located 4 feet or less from the interior grille shall have a Minimum Efficiency Ratin�Value(MERV)of at least 6. <br /> sone ratin�of 1.0 or less measured at 0.10 inches water <br /> gause.Manufacturer's noise ratings shall be determined as 403.�.9 dVhole house ventil�kion svith heat recovery or <br /> per HVI 915. Remotely mo�mted fans sh�.11 be acoustically energy recovery ventilatio�system�. This section <br /> q isolated from the struct�iral elements of the building and establishes minimum requirements for mechanical�vhole <br /> � fi-om attached d�ictworlc using insulated fleYible d��ct or house ventilation systems usin�heat recovery or enes-gy <br /> other approved material. recovery ventilation systems. <br /> 403.�.7 V6'hole house ventilation integrated�vith forced- 403.�.9.1 Od�tdoor air. Heat recovery or energy recovery <br /> aia-systems. This section establishes minimum ventilation systems shall provide outdoor air through one of <br /> requirements for mechanical�vhole house ventilation the following methods: <br /> systems using forced-air system fans. 1.A dedic�ted outdoar air louver 1nd outdoor air duct for <br /> 403.&.7.1 Outdoor air. Forced-air system fan ventilation each d�velling imit or sleepin�unit shall supply <br /> systems shall provide outdoor air throu�h one of the outdoor air to the heat recovery or energy recovery <br /> following methods: ventilator; or , <br /> 1. A dedicated outdoor air louver and outdoor air duct ��A central outdoor air heat recovery or ener�y recovery <br /> for each dwelling unit ar sleeping tmit shall slipply unit shall distribute conditioned air to multiple <br /> o�itdoor a'ir to the ret�►rn side of the forced-air system dwellin�units or sleepin�units. <br /> fan; or 403.�.9.2 Whole hou�e heat recovery ventilator system. <br /> �. A central outdoor air delivery system that supplies Where outdoor air is provided to each habitable dwellin� <br /> multiple d4velling imits or sleeping tmits shall slipply unit or sleeping iinit by heat recovery or energy recovery <br /> outdoor air to the return side of the forced air system ventilator the outdoor air shal(be filtered.The filter shall be <br /> fan. located on the upstream side of the heat exchanger in both <br /> the intake and e�aust airstreams with a Minimum <br /> 403.�.7.2 Whole hou�e forced-air system. Where outdoor Efficiency Rating Value(MERV)of at least 6.The system <br /> air is provided to each habitable cl�velling�mit or sleeping filter may be located at the intake device or inline with the <br /> unit by a forced-air system,the outdoor air duct shall be fan. The filter shall be accessible for re�ular maintenance <br /> connected to the rettun air stream at a point within 4 feet and replacement. <br /> upstream of the forced-air imit. It shall not be connected <br /> directly to the forced-air unit cabinet in order to prevent <br /> 4 <br /> (Insert as Page 37e) <br /> Effective July 1, 2013 <br />