R307-207-3. Opacity for Residential Heating

Visible emissions from residential solid fuel burning devices and fireplaces shall be limited to a shade or density no darker than 20% opacity as measured by EPA Method 9, except for the following: (1) An initial fifteen minute start-up period, and (2) A period of fifteen minutes in any three-hour period in which emissions may exceed the 20% opacity limitation for refueling.