Section SPS 322.46 - Replacement furnace and boiler efficiencies(1) A replacement furnace in existing construction may meet only the prevailing federal efficiency standard provided the duct distribution system is sealed and tested at 0.02 inches water gage across the entire system, including the manufacturer's air handler enclosure, to have air leakage less than 10 percent of the furnace manufacturer's rated air flow across the blower at high speed.Note: 0.02 inches water gage is equal to approximately 25 pascals.
(2) A replacement boiler in existing construction may meet only the prevailing federal standard provided there is no installed circulation pump larger than 1/20 horsepower and no circulation pump runs continuously.Wis. Admin. Code Department of Safety and Professional Services SPS 322.46
CR 08-043: cr. Register March 2009 No. 639, eff. 4-1-09.