My Field Control "RC" draft control is the 6" model yet the cutout in the furnace pipe is about 3"--is this a problem? Also the counterweight is on the wrong side for a horizontal installation.
Thanks
Lakeguy

It should be cut the size of the draft control UNLESS you have a draft problem. The counter weight might also be there for the same reason. You need a draft gauge to be able to tell what is really going on instead of what you think is wrong. A improperly adjusted draft contorl can cost big $$$ in the utility bill.

I know what's wrong I'm just trying to confirm it. The guy that installed my furnace had a stroke. The two different service companies that have been at my house since can't do much beyond changine filters and nozzles. I know how to do that but I was trusting the experts. The air shutter appears to be open too far as is the air band which may explain the 720 degree stack temp measured upstream of the damper. The draft is -.02 which is what the mfg recommends. Can't you reduce air to a no smoke condition and the fine tune the draft number?
Lakeguy

Yes you can by cutting down the intake damper on the burner. CAUTION***

You will be better served to find a company that has the proper digital tools and have them set your burner up. (eye balling) is no longer acceptable as the cost of oil is at or near $3.00 and going up in the future. I use a Kane May tester on fuel fired equipment but other brands are available.

You can send a lot of unused fuel up the stack without the proper adjustments and in today's world that is just foolish. Years ago I used to tell the commercial customers running 25 to 50 gallon per hour cluster heads the same thing and now I am telling the residential people I talk to the same thing I am telling you. Get it done and make it right. Not only your wallet be happy but also the environment.

The last guy had a digital instrument and that's what gave the 720 stack temp--seemed OK to him. I have a call into the owner. I'll keep you posted.