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    RustBucket's Avatar
    RustBucket Posts: 6, Reputation: 1
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    #1

    Feb 2, 2009, 02:23 PM
    HVAC indoor vent CFM
    In general, can you tell me what the CFM of air should be for a furnace coming out of a vent?

    Thank you!
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Feb 2, 2009, 06:10 PM
    Not really. There is basically no set standard since it depends upon the blower hp, size of duct, length of duct, grill type for a deduction of air flow etc. Sorry but that is just the way it works in this business.
    RustBucket's Avatar
    RustBucket Posts: 6, Reputation: 1
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    #3

    Feb 2, 2009, 06:55 PM
    Quote Originally Posted by RustBucket View Post
    In general, can you tell me what the CFM of air should be for a furnace comming out of a vent?

    Thank you!
    Thanks for the response... can you give me a range? Surely there must be a standard for a given size room? I would think the larger the room the more CFM needed?

    I have a 3 ton 1200CFM blower furnace that I am working on.
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #4

    Feb 2, 2009, 07:30 PM
    Here is a 40 year old chart. Every thing else here is electronic programing that needs a complete set of parameters which you do not have.
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