NR 440.642(2)(f)(f) “Furnace” means a solid fuel burning appliance that is designed to be located outside of ordinary living areas and that warms spaces other than the space where the appliance is located by the distribution of air heated in the appliance through ducts. The appliance shall be tested and listed as a furnace under accepted American or Canadian safety testing codes unless exempted from this provision by the administrator. A manufacturer may request an exemption in writing from the administrator by stating why the testing and listing requirement is not practicable and by demonstrating that the appliance is otherwise a furnace.

NR 440.642(2)(g)(g) “Manufactured” means completed and ready for shipment (whether or not packaged).

NR 440.642(2)(h)(h) “Manufacturer” means any person who constructs or imports a wood heater.

NR 440.642(2)(i)(i) “Model line” means all wood heaters offered for sale by a single manufacturer that are similar in all material respects.

NR 440.642(2)(j)(j) “Representative affected facility” means an individual wood heater that is similar in all material respects to other wood heaters within the model line it represents.

NR 440.642(2)(k)(k) “Sale” means the transfer of ownership or control, except that transfer of control may not constitute a sale for purposes of sub. (1) (f).

NR 440.642(2)(L)(L) “Similar in all material respects” means that the construction materials, exhaust and inlet air system and other design features are within the allowed tolerances for components identified in sub. (4) (k).

NR 440.642(2)(m)(m) “Wood heater” means an enclosed woodburning appliance capable of and intended for space heating or domestic water heating that meets all of the following criteria:

NR 440.642(2)(m)1.1. An air-to-fuel ratio in the combustion chamber averaging less than 35-to-1 as determined by the test procedure prescribed in sub. (5), performed at an accredited laboratory,

NR 440.642(2)(m)3.3. A minimum burn rate less than 5 kg/hr (11 lb/hr) as determined by the test procedure prescribed in sub. (5) performed at an accredited laboratory.

NR 440.642(2)(m)4.4. A maximum weight of 800 kg (1,760 lb). In determining the weight of an appliance for these purposes, fixtures and devices that are normally sold separately, such as flue pipe, chimney, and masonry components that are not an integral part of the appliance or heat distribution ducting, may not be included.

NR 440.642(3)(b)(b) Manufactured on or after July 1, 1990, or sold at retail on or after July 1, 1992, shall comply with the following particulate matter emission limits as determined by the test methods and procedures in sub. (5):

NR 440.642(3)(b)1.1. An affected facility equipped with a catalytic combustor may not discharge into the atmosphere any gases which contain particulate matter in excess of a weighted average of 4.1 g/hr (0.009 lb/hr). Particulate emissions during any test run at any burn rate that is required to be used in the weighted average may not exceed the value calculated for “C” (rounded to 2 significant figures) calculated using the following equation:

NR 440.642(3)(b)2.2. An affected facility not equipped with a catalytic combustor may not discharge into the atmosphere any gases which contain particulate matter in excess of a weighted average of 7.5 g/hr (0.017 lb/hr). Particulate emissions may not exceed 15 g/hr (0.033 lb/hr) during any test run at a burn rate less than or equal to 1.5 kg/hr (3.3 lb/hr) that is required to be used in the weighted average, and particulate emissions may not exceed 18 g/hr (0.040 lb/hr) during any test burn at a burn rate greater than 1.5 kg/hr (3.3 lb/hr) that is required to be used in the weighted average.

NR 440.642(4)(a)(a) For each model line, compliance with applicable emission limits may be determined based on testing of representative affected facilities within the model line.

NR 440.642(4)(b)(b) Any manufacturer of an affected facility may apply to the administrator for a certificate of compliance for a model line. The application shall be in writing to: Stationary Source Compliance Division (EN-341), U.S. Environmental Protection Agency, 401 M Street SW, Washington DC 20460, Attention: Wood Heater Program. The manufacturer shall submit 2 complete copies of the application and attachments. The application shall be signed by the manufacturer, or an authorized representative, and shall contain the following: