air-to-fuel ratio of a non-airtight fireplace. These are EPA exempt and therefore cannot be installed in YSAQMD's jurisdiction under Rule 2.40.

a popular accessory to help boost combustion in wood fires, feeding air to the flames as it is forced out of an expandable bladder. Though unnecessary for a gas hearth where the combustion level is easily controlled with the turn of a knob, bellows' lovely finish in attractive blends of fine woods with vinyl or leather makes them a decorative [..]

a device used on some wood burning stoves to reduce the temperature at which smoke is ignited. Clearance

a very flammable byproduct of combustion that can build up within the smoke pipe and chimney and then ignite, causing "chimney-fire." Direct Vent Appliance

byproducts of combustion vented out of the home. EPA Exempt

government regulations of wood burning heaters mandating that products sold after July 1, 1992, emit no more than 4.1 grams of particulate matter per hour for catalytic-equipped units and no more than 7.5 grams for non-catalytic-equipped units. Firebacks

any permanently installed masonry or factory built device designed to operate with an air-to-fuel ratio greater than or equal to 35-1.

heating units that retrofit into an existing fireplace (masonry or factory-built). They burn wood, gas or wood pellets and offer superior efficiency. Flue

a heating appliance normally on legs or a pedestal that occupies an area roughly equal to that of an easy chair. Gas Logs

close off the opening of the hearth so heat from the central heating system does not escape up the chimney when the fireplace is not being used. Grate