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  1. #1
    Join Date
    Jul 2009
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    new york
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    612

    Cant find info on cfm that most room ac are designed for

    Have a customer that wants a room ac what cfm are they usually designed for 300 or 400 cfm or more . And what is the two spped fan motor going to do. Will it increase the EER rating or just reduce running time

  2. #2
    Join Date
    Dec 2010
    Location
    The Quad-Cities area (midwest).
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    2,606
    You'll want the Btiu, not CFM, of a window unit needed for a particular space. The slower speed will de-humidify better. The higher speed (fan) is for better throw.

  3. #3
    Join Date
    Jul 2009
    Location
    new york
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    Quote Originally Posted by George2 View Post
    You'll want the Btiu, not CFM, of a window unit needed for a particular space. The slower speed will de-humidify better. The higher speed (fan) is for better throw.
    true but was in a class and they mentioned a standard Cfm that window unit must meet

  4. #4
    Join Date
    Dec 2010
    Location
    The Quad-Cities area (midwest).
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    Quote Originally Posted by bwd111 View Post
    true but was in a class and they mentioned a standard Cfm that window unit must meet
    I can't help you with that. I'm not sure why the amount of CFM would require a set "standard". It either cools or not depending on the size to the area/load.

  5. #5
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
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    4,158
    CFM is normally low per ton compared to central systems in order to reduce noise. Flows under 300 cfm per ton aren't uncommon.

  6. #6
    Join Date
    Jul 2011
    Location
    East coast USA
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    960
    Quote Originally Posted by bwd111 View Post
    Have a customer that wants a room ac what cfm are they usually designed for 300 or 400 cfm or more . And what is the two spped fan motor going to do. Will it increase the EER rating or just reduce running time

    never heard that before, most window boxes are based on room size or area. I would differently size by room size and load.

  7. #7
    Join Date
    Jul 2009
    Location
    new york
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    612
    It's 300 Cfm. Most widow units have 35 evap and run cooler and 300cfm gives you about 30 degree difference between in and out going air

  8. #8
    Join Date
    Jun 2001
    Location
    Moore, Oklahoma, United States
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    4,158
    Quote Originally Posted by bwd111 View Post
    It's 300 Cfm. Most widow units have 35 evap and run cooler and 300cfm gives you about 30 degree difference between in and out going air
    Is the 300CFM for high or low speed?

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