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2018 Washington State Energy Code—Residential <br /> Prescriptive Energy Code Compliance for All Climate Zones in Washington <br /> Single Family—New&Additions(effective February 1,2021) <br /> Table 406.3—Energy Credits(Single Family) <br /> Option Description Credits:SF <br /> 2.AIR LEAKAGE CONTROL AND EFFICIENT VENTILATION OPTIONS <br /> Only one option from Items 2.1 through 2.4 may be selected in this category. <br /> Compliance based on R402.4.1.2: Reduce the tested air leakage to 3.0 air changes per hour <br /> maximum at 50 Pascals or <br /> For R-2 Occupancies,optional compliance based on Section R402.4.1.2: Reduce the tested air <br /> leakage to 0.3 cfm/sf maximum at 50 Pascals and <br /> All whole house ventilation requirements as determined by Section M1507.3 of the <br /> 2.1 International Residential Code or Section 403.8 of the International Mechanical Code shall be 0.5 <br /> met with a high efficiency fan(s)(maximum 0.35 watts/cfm),not interlocked with the furnace <br /> fan(if present).Ventilation systems using a furnace including an ECM motor are allowed, <br /> provided that they are controlled to operate at low speed in ventilation only mode. <br /> To qualify to claim this credit,the building permit drawings shall specify the option being <br /> selected and the maximum tested building air leakage,and shall show the qualifying ventilation <br /> system and its control sequence of operation. <br /> Compliance based on Section R402.4.1.2:Reduce the tested air leakage to 2.0 air changes per <br /> hour maximum at 50 Pascals or <br /> For R-2 Occupancies,optional compliance based on Section R402.4.1.2: Reduce the tested air <br /> 2.2 leakage to 0.25 cfm/sf maximum at 50 Pascals and 1.0 <br /> All whole house ventilation requirements as determined by Section M1507.3 of the <br /> International Residential Code or Section 403.8 of the International Mechanical Code shall be <br /> met with a heat recovery ventilation system with minimum sensible heat recovery efficiency of <br /> 0.65.1 <br /> Compliance based on Section R402.4.1.2: <br /> Reduce the tested air leakage to 1.5 air changes per hour maximum at 50 Pascals or <br /> For R-2 Occupancies,optional compliance based on Section R402.4.1.2: Reduce the tested air <br /> 2.3 leakage to 0.25 cfm/sf maximum at 50 Pascals and 1.5 <br /> All whole house ventilation requirements as determined by Section M1507.3 of the <br /> International Residential Code or Section 403.8 of the International Mechanical Code shall be <br /> met with a heat recovery ventilation system with minimum sensible heat recovery efficiency of <br /> 0.75.1 <br /> Compliance based on Section R402.4.1.2 <br /> Reduce the tested air leakage to 0.6 air changes per hour maximum at 50 Pascals or <br /> For R-2 Occupancies,optional compliance based on Section R402.4.1.2:Reduce the tested air <br /> 2.4 leakage to 0.15 cfm/sf maximum at 50 Pascals and 2_0 <br /> All whole house ventilation requirements as determined by Section M1507.3 of the <br /> International Residential Code or Section 403.8 of the International Mechanical Code shall be <br /> met with a heat recovery ventilation system with minimum sensible heat recovery efficiency of <br /> 0.80.Duct installation shall comply with Section R403.3.7.1 <br /> 1 To qualify to claim this credit,the building permit drawings shall specify the option being selected and shall specify <br /> the maximum tested building air leakage and shall show the heat recovery ventilation system. <br /> Rev.10-27-22 Prescriptive Path—Single Family 2018 Washington State Energy Code-R 5 1 <br />