Last Activity:11-24-2010 7:00 AM
Posted in thread: Duct Size on 11-03-2010 at 05:57 AM
A 6' oval pipe is only good for about 90 to 70 CFM of air. 6 rd is 110 CFM 8" rd is 225 CFM
paulSo would it be better to go with a rectangle duct then? Like a 10x3.5 or 12x3.5 to get it
Posted in thread: Duct Size on 10-31-2010 at 07:43 PM
It would help if you run 8" to the up stairs run. I would run the new hot air run in 8" and
split it into too 6" up stairs, one to bath and one to main part. Run a 8" return air and try
to get the ret...
Posted in thread: Duct Size on 10-31-2010 at 12:01 PM
If you only have 6 hot air opening then you should leave them all open so you don't over heat
the furnace. A blower can only built up so much static pressure, after that it will just start
Posted in thread: Duct Size on 10-31-2010 at 10:00 AM
Do the runs down stairs blow hard? How many turns does that up stairs run have in it? Are you
sure that the blower is on hi speed? later paulAll the runs downstairs do blow hard. I actually
have 2 of ...
Posted in thread: Duct Size on 10-30-2010 at 04:43 PM
Ok the model # of the furnace is GNE075B12G1. The 1st floor square footage is 650, the 2nd
floor is 300 (its a 1 1/2 story). There is a 8"x24"x8' supply trunk on the top of the furnace
with 4 - 6" rou...
Posted in thread: Duct Size on 10-28-2010 at 03:26 PM
This is a engineering question . I lay out a hot air ducts 1.0 static pressure and return air
to a .o8 static pressure. Using these numbers you can get 150 CFM of air through the 3.5x12.
110 CFM throu...
Posted in thread: Duct Size on 10-26-2010 at 06:28 PM
I have a 3.5" x 12" supply duct running from my basement up to my 2nd floor. The supply pipe
from the furnace to the rectangle duct is a 6" round and also from the end of the rectangle
duct to the reg...
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