I agree with DaveL.. I purchased and installed a 75,000 BTU Hamilton garage furnace from Carter Lumber (same design as Modine) a few months ago. I love it. Heats my new 32' x 28' unattached gargare very easlily. I have 30,000 BTU unvented wall mounted heater in my 22' x 26' attached garage and...
I've had my I-drive opener for about 3 months now. No problems so far. I installed it myself on a Wayne-Dalton door.
It opens quickly, is quiet, and I like the way it locks when closed.
Hairy Dog