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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 /> -......_ ..----.. ....... . ... <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 j <br /> per hour maximum at 50 Pascals or <br /> i <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 /> ........----- .. <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 /> —......._ . _.--..__ .. ..__.._.— ._.............. <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 /> ... --- -- ---- - -- .:---- <br /> ' 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 /> ... ......... ... <br /> Prescriptive Path—Single Family 2018 Washington State Energy Code-R 5 <br />