Quote:
Originally Posted by cabmando
The odd thing is, that return grille is a filter grille. It's designed to have a filter in it. From the looks of the pic, about a 2" thick 16x24 filter. If that 24" is oval shaped to fit that grille, it's part of the restriction as well. Then add all the kinks from going through floor joist spaces and you've reduced the effective size of the duct to a point that the static pressure can't be calculated.
|
Yup, I did notice that a while ago (last year) when I noticed there was no filter in it. When the testing on that fibrous material comes back, and if it's fine, I think I'm just going to tear into the thing, remove 10' or so of return vent, see what I can do to modify the intake vent to reduce the restrictions and see if that works. Disconnecting that big return line from the bottom of the convoluted vent and then testing the blower again will give many more clues. But - I want to make sure that stuff doesn't have asbestos in it. If it does, then the heater is indeed the least of my worries (just went through that with our other house in LA!).
-Wayne