Coal Stove Heat Duct Temps

I'm getting my HyFire II very shortly. I have a 10" pipe that will feed into some existing duct work to feed the house. But I'm worried about the temps of the hot air and the fact that after about 5 feet of pipe duct work, the "duct" is nothing more than a sealed wall cavity. I guess with the normal heat pump this was ok becuase the temps for the air are never greater than 100. But with the coal stove I suspect the air temps to be far greater.

Does this pose a fire risk?

An engineer friend told me wood can ignite as low as 300 degrees. But I'm just not sure how hot the exhaust air will be.

If you can get you air temperature up to 300*, you won't have to worry about the house catching on fire.
Wood that is exposed to very high temps for long periods can ignite at much lower temps, perhaps 220*. I would place a thermometer at the opening and see what the actual air temp is flowing into the duct. If it is less than 200* there should be no problem. If it exceeds that, insulate the duct.

Depending on the blower setup, I am using the stock blowers on the stove.
I have Temp probe in the 8" duct going upstairs which about 4 feet from the stove, it doesn't get much over 120 degrees so far.

coaledsweat wrote:If you can get you air temperature up to 300*, you won't have to worry about the house catching on fire.

Why? because the house is already on fire if the duct is 300 degrees?

Actually not a bad Idea, we had the rehostat fail that controlled the fans and the duct temps going upstairs got up around 200 degrees.....luckily we were home when I smelled something getting HOT and I unplugged the rehostat/fans and plugged into an outlet.

Installing a bimetallic type "snap switch" rated to open at whatever temp you think is reasonable is a cheap way to ensure that an overtemp will not occur.

If you wire the stove power through the switch it will shut things down till the lower limit is reached.