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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 <br />air 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 />International Residential Code or Section 403.8 of the International Mechanical Code shall <br />2.1 be met with a high efficiency fan(s) (maximum 0.35 watts/cfm), not interlocked with the 0.5 <br />furnace fan (if present). Ventilation systems using a furnace including an ECM motor are <br />allowed, provided that they are controlled to operate at low speed in ventilation only <br />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 <br />ventilation 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 <br />per hour maximum at 50 Pascals or <br />For R-2 Occupancies, optional compliance based on Section R402.4.1.2: Reduce the tested <br />2.2 air 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 <br />be met with a heat recovery ventilation system with minimum sensible heat recovery <br />efficiency of 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 <br />2.3 air 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 <br />be met with a heat recovery ventilation system with minimum sensible heat recovery <br />efficiency of 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 <br />2.4 air 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 <br />be met with a heat recovery ventilation system with minimum sensible heat recovery <br />efficiency of 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 <br />specify the maximum tested building air leakage and shall show the heat recovery ventilation system. <br />Prescriptive Path — Single Family 2018 Washington State Energy Code-R <br />