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Firebox Door Frame
The seal itself consists of a fiberglass rope in the groove of the firebox door, covered with high temperature
silicone.
Failure to manage and maintain the firebox door gasket could result in air entering into the firebox when the
combustion air fans are off or smoke escaping around the seal when the combustion air blowers are running.
Air entering the firebox when the
fan is off
results in the wood continuing to smolder, resulting in the furnace
overheating and more than a “wiff” of exhaust emitting from the chimney. Often, this type of exhaust has an
unpleasant odor. Creosote will also be formed.
When the fan is running and the door seal is not sealing tightly, smoke will be forced through the leaking door
seal. This causes the front of the furnace to be smoke filled and soon the front of the firebox will be covered
with soot. Premature replacement of parts and a buildup of creosote will result.
Removal and Replacement
1) Using a sharp knife, carefully cut away the silicone seal around the firebox door seal channel.
2) Remove the old gasket from underneath the old silicone.
3) Remove all old silicone with a wire wheel or steel brush.
4) Replace with a single length of new gasket material. Do not pack or over stretch the new gasket.
Once in place allow, the material to “relax” before cutting to length.
5) Cover the door rope with silicone and tool to a smooth, flat, finish.
6) Leave the firebox door open for 24 hours to allow silicone to dry completely.
nOte:
You will need 78 inches of 1 inch door rope material plus two tubes of caulking. The door rope kit is
available from your HEATMOR™ dealer.
Firebox Door Frame
Principles of the Firebox Door Frame
To provide a small edge that will seal into the firedoor
gasket to provide an airtight seal.
Maintenance / result
Keep the door frame cleaned down to the steel at all times.
Failure to do so results in a build up of creosote, resulting
in a barrier to an airtight seal, air leaks and premature
gasket replacement.
aBsOLuteLY nO Fire in the FireBOX When PerFOrMinG
this rePair. DO nOt PerFOrM this rePair When unit
Water teMPerature is unsaFe. aLWaYs Wear PrOPer
PersOnaL PrOtective eQuiPMent.
