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�lJi11 Washington Sto:;to Energy Code—Reside;;u; , Prescriptive Energy Code Compliance for All Climate Zorres in Washington Single Family—New&Additions(effective February 1,2021) Table 406.3—Energy Credits(Single Family) Option Demcription Credits:SF 2.AIR LEAKAGE CONTROL AND EFFICIENT VENTILATIOPil OPTIONS Only cane option from Items 2.:I through 2.4 may be selected in this category. Compliance based on R402.4.1.2:Reduce the tested air leakage to 21.0 air changes per hour maximum at 50 Pa:icals or For R-2 Occupancies, optional compliance based on Section R402.4.11..2: Reduce the tested air leakage to 0.3 rim/sf maximum at 50 Poiscals and All whole house ventilation requirements as determined by Section M1507.3 of the International Residential Code or Section 443.8 of the International i,4echanical 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 system: using a furnace including an ECM motor are allowed, provided-:hat they are controlled lo operate at low speed in ventilation only mode. To qualify to claim this credit,the building l::ermit 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 P ascals and 1.0 All whole house ventilation requirements as determined by Section M1507.3 of the International Residential Code or Section 4:3.8 of the International ,4echonical Code shall be met with a heal:recovery ventilation sysl:em with minimum sensible heat recovery efficiency of 0.65. ' 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 4C3.8 of the International i,4echanical Code shall be met with a heal:recovery ventilation sysl:em with minimum sensible heat recovery efficiency of 0.75. ' Compliance based on Section R402.4.1.2: Reduce the tested air leakage to 0.6 air cha riges per hour maximum at 50 Pascals or For R-2 Occupancies,optional compliance based on Section R402.4.:1..2: Reduce the tested 2 ,;I 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 4C3.8 of the International Mechanical Code shall be met with a heat:recovery ventilation sysl:em 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. Prescri:tive Path—Single Family 2018 Washington State Energy Code-R 5