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Old 04-20-2008, 05:44 PM   #1
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A/C Fan Speed


I have a Carrier FK4BNF003 air conditioner which has a GE BF0S 1ROH 1/2 HP fan motor. With the CFM speed set on high, I am still not getting enough air flow. Assuming the vent system is okay (which I know is a big and often incorrect assumption), can I up-size the blower motor to get more CFM? (The unit claims 375 cfm/ton). (The unit is paired with a 38TRA A/C compressor unit.

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Old 04-20-2008, 07:41 PM   #2
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A/C Fan Speed


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Originally Posted by knucklehead411 View Post
I have a Carrier FK4BNF003 air conditioner which has a GE BF0S 1ROH 1/2 HP fan motor. With the CFM speed set on high, I am still not getting enough air flow. Assuming the vent system is okay (which I know is a big and often incorrect assumption), can I up-size the blower motor to get more CFM? (The unit claims 375 cfm/ton). (The unit is paired with a 38TRA A/C compressor unit.
I'm not a AC guy, but how do you know your not getting enough CFM?

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Old 04-21-2008, 10:02 AM   #3
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A/C Fan Speed


Nothing scientific .. just low airflow from all vents. Three additional vents were added to the original installation, so the unit may now be undersized. I'm hoping I could increase the blower size/RPM without losing too much cooling. Thanks!
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