Well I just replaced my combustion blower after 5 years of heavy use. stove is nice a quite again. Lately it seems like I have to laeve it on quad setting to get enough heat from it. Last year on the coldest days I would only have to set it at high most of the time I could leave it on med. My convection blower does not seem like it is getting loud. but even on quad you can put your hand in front of the stove and you get warm air not the real heat it should be putting out what temp should I get coming out the end of the heat exchanger. I just think my convection blower is not putting out the cfm any more. It seemed like on quad it was like a jet engine in the room. It does not sound like that now. how can you tell if the convection blower is going bad?