I have a problem with the furnace in my shop. It's a Modine, gas-fired, ceiling hung furnace. It heats the shop just fine. My problem is with condensation. The flue runs up into the garage, takes a 90 degree turn for about 10 feet, and then another 90 degree turn through the roof. Condensation is collecting beneath the second 90 degree turn, where it goes through the roof. The space beneath the attic that the flue runs through is conditioned--I have R-38 insulation between the conditioned space and the attic.

Do we have any HVAC experts on SMC? I'd call my HVAC guys, but they're the ones who caused the problem to begin with. I'm afraid I won't have much choice but to catch the condensation and let it drain outside. Any other ideas?

Jeff