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Code dictates that when a combustion appliance draws air through a duct directly from the outside, an opening of 2 sq in per 4 kbtu/h is required. A dryer produces less than 40 kbtu/hr, so only 20...

Update on my modified dryer venting: Finished the system, installing a gravity-operated damper on the intake, insulated all the ducts, and still working just great. Lots of velocity at the exit,...

If I'd stuck with the coaxial pipe idea, I'd have switched to an 8" outside pipe to be sure to have very little resistance on the intake side. But because I would have to insulate the whole thing...

If the fan motor is turning, the blades are turning. It may be that the booster is working against pressure, and is not able to reach a rate of airflow that you can feel. Additionally, the lint...

Again, though, the "minimum ventillation required for a gas appliance when in an enclosed place like a closet" is with the assumption that outside the closet, the air is drawn through accidental...

I didn't make it clear enough that I'm going to skip the makeup air blower, and just provide the air via the 6" round duct and the larger rectangular duct. As that provides more than twice the cross...

Regarding what the dryer manual says about 72 sq in unobstructed air intake when installed in a closet: what are the assumptions there? If I install to that requirement in a house with 1 air change...

I have the 4" exhaust run finished, with a Broan Ecovent damper. The run has two 90's and a 45, and about 17' straight. The manual allows 45' of straight pipe with three 90's, so I'm well inside...

Well, a 6" inline duct booster will provide a maximum of 250 cfm when it is boosting existing airflow. I figure the dryer will draw 150-200 cfm for both combustion and drying. The fan, working from...

For heat recovery, I'm using a coaxial counterflow setup, with make-up air for the gas dryer coming from outside of the house. 4" duct for centered in 6" supply duct. Will have a 4" dryer booster...

I don't think I was clear enough in my post. If the dryer intake is sealed, so that the make-up air is pressurized in the dryer, how would that affect performance?

Hello, this is my first post here. Regarding boosting the dryer exhaust: what about boosting the dryer intake? The fan could be a a cheapy (not a $200 exhaust booster, made to work with lint), and...