2404 74TH ST SE 2022 Plans 2024-05-16

TABLE 406.3(continued) ENERGY CREDITS CREDIT(S) OPTION DESCRIPTION --------- —r All Other r Group R-2 4.HIGH EFFICIENCY HVAC DISTRIBUTION SYSTEM OPTIONS 4.1 j All supply and return ducts located in an unconditioned attic shall be 0.5 0.5 deeply buried in ceiling insulation in accordance with Section R403.3.7. For mechanical equipment located outside the conditioned space,a maximum of 10 linear feet of return duct and 5 linear feet of supply duct connections to the equipment may be outside the deeply buried insulation. All metallic ducts located outside the conditioned space must have both transverse and longitudinal joints sealed with mastic. If flex ducts are used, they cannot contain splices. Duct leakage shall be limited to 3 cfm per 100 square feet of conditioned floor area. Air handler(s)shall be located within the conditioned space. 4.2 i HVAC equipment and associated duct system(s)installation shall comply 1 0 N/A i with the requirements of Section R403.3.7. Locating system components in conditioned crawl spaces is not permitted under this option. Electric resistance heat and ductless heat pumps are not permitted under this option. Direct combustion heating equipment with AFUE less than 80%is not permitted under this option. To qualify to claim this credit,the building permit drawings shall specify the option being selected and shall specify the heating equipment type and shall show the location of the heating and cooling equipment and all the ductwork. 5.EFFICIENT WATER HEATING OPTIONS 1 Only one option from Items 5.2 through 5.6 may be selected in this category.Item 5.1 may be combined with any option. 5.1 A drain water heat recovery unit(s)shall be installed,which captures waste 0.5 0.5 water heat from all and only the showers,and has a minimum efficiency of 40%if installed for equal flow or a minimum efficiency of 54%if installed for unequal flow.Such units shall be rated in accordance with CSA B55.1 or IAPMO IGC 346-2017 and be so labeled. To qualify to claim this credit,the building permit drawings shall include a plumbing diagram that specifies the drain water heat recovery units and the plumbing layout needed to install it.Labels or other documentation shall be provided that demonstrates that the unit complies with the standard. i 5.2 ,`Water heating system shall include one of the following: /0 0.5 /, Energy Star rated gas or propane water heater with a minimum UEF of 0.80. To qualify to claim this credit,the building permit drawings shall specify the option being selected and shall specify the water heater equipment type and the minimum equipment efficiency. • RE-46 2018 Washington State Energy Code