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