I have trouble getting a nice blue flame from my monitor since new. It is vented about 10 feet from outside wall. It only burns dull yellow, and soots up really bad. I know I have a combustion air problem, but I don't know if it's the 10 foot length to get there. I suspect it is. I take it to the qualified tech, and it runs fine for him in the shop. Probably because he's only at most 2 feet from outside air. He did not know that would be a problem, but he's never had a complaint for another one.

I experimented with compressed air, I blew into the intake pipe and the flame cleared up nice and blue like it supposed to. My question is if I can take a small fan, like a computer fan, install it in the duct, and see if that will give me enough extra CFM to clear the flame. If it does work, how does a fellow wire the fan in to make it automatic when it's needed. I'm sure it'll work if I can get enough air in the combustion space.

Has anyone ever had these issues with a monitor heater. Service person is no help. Thanks for anyone who can help.

question is if I can take a small fan, like a computer fan, install it in the duct, and see if that will give me enough extra CFM to clear the flame.

Not recommended. The install of your unit needs to be checked by a professional. This is nothing to play with.

Thanks for the response, but it has been to the professional 3 times and the professional has been to it too many times to count. I think the manufacturer should not advert that they work with this length of piping, although they sell it. Some more R&D on their part is in order.

I agree.

Thanks for the vote of support. I will let you know how my experimentation works out.