WAC 51-11C-40248. Section C402.5.10 — Recessed lighting

C402.5.10 Recessed lighting. Recessed luminaires installed in the building thermal envelope shall be all of the following: 1. IC rated. 2. Labeled as having an air leakage rate of not more than 2.0 cfm (0.944 L/s) when tested in accordance with ASTM E 283 at a 1.57 psf (75 Pa) pressure differential. 3. Sealed with a gasket or caulk between the housing and interior wall or ceiling covering. C402.5.11 Operable openings interlocking. Where any operable openings to the outdoors are larger than 48 square feet (4.47 m 2 ) in area, such openings shall be interlocked with the heating and cooling system as required by Section C403.4.1.6. EXCEPTIONS: 1. Separately zoned areas associated with the preparation of food that contain appliances that contribute to the HVAC loads of a restaurant or similar type of occupancy. 2. Warehouses that utilize overhead doors for the function of the occupancy, where approved by the code official . 3. The outer entrance doors where located in the exterior wall and are part of a vestibule system. 4. Alterations to existing buildings.