Forum Discussion
Old-Biscuit
Oct 23, 2013Explorer III
Depending on size of furnace MAX CFM from blower can be as low as 140 up to 440.
Suspect you probably have a 30-35000 btu furnace so air flow should be around 350-370 CFM
Any bends can lower air flow. Loose ducts at furnace can lower air flow, crushed duct can lower air flow. Duct work should run as straight as possible.
The air flow should be reasonably the same at all ducts if properly sized and installed.
Back to dealer and have them check that register and duct work with a mirror, camera or by removing the underbelly cover.
It is probably crushed, torn or is not properly attached at furnace.
You should have fired up the furnace at the dealers and had them show you how fine it was. Then you could have had a discuss with them right then and there.
Suspect you probably have a 30-35000 btu furnace so air flow should be around 350-370 CFM
Any bends can lower air flow. Loose ducts at furnace can lower air flow, crushed duct can lower air flow. Duct work should run as straight as possible.
The air flow should be reasonably the same at all ducts if properly sized and installed.
Back to dealer and have them check that register and duct work with a mirror, camera or by removing the underbelly cover.
It is probably crushed, torn or is not properly attached at furnace.
You should have fired up the furnace at the dealers and had them show you how fine it was. Then you could have had a discuss with them right then and there.
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