I have a Bradford White TTW1 ("through the wall") water heater. It has a
forced exhaust fan and is vented via 2" PVC to the adjacent wall - a
total of about 5 feet of PVC. There are 3 90's and 2 45's on the way
out. (Within spec according to the manual.)
The problem is that it is vented to my deck about 6 feet off the ground
and is really loud when running. It's not just the air moving, but also
has a definite resonant frequency.
How can I make this a *lot*
1. Replace with 3" or 4" PVC?
2. Some sort of muffler in-line or at the exit point?
Holding on to the pipe doesn't seem to affect the sound so I don't think
wrapping or bracing it will help. The fan is single speed, or I would
turn it down.
Anyone ever solved this problem before?