Air ducts—Duct and plenum insulation.
Every heating and cooling duct and plenum must be installed according to the International Mechanical Code and the Washington State Energy Code.
[Statutory Authority: Chapter
43.22 RCW and 2003 c 291. WSR 05-01-102, § 296-150C-1520, filed 12/14/04, effective 2/1/05. Statutory Authority: RCW
43.22.340, [43.22.]355, [43.22.]360, [43.22.]432, [43.22.]440 and [43.22.]480. WSR 96-21-146, § 296-150C-1520, filed 10/23/96, effective 11/25/96.]
