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  1. #1

    ventilation system help

    my boss asked me to build a ventilation hood for him. i have built the hood but i am having trouble figuring out what size fan i need.
    the hood has a plenum that is 12"X8"X60" the 60X8 side that faces down is perforated steel that is 23%open. on the top i have 2 opening 4' apart where 6"diameter ducts attach, these ducts go up 3" then turn 90 deg towards each other then go to a T where they connect and go 4' up to where the fan will attach. My boss wants the system to have a flow rate of 300 cf/m. can you help me figure what the cfm rating for the fan should be?

    thank you very much

  2. #2
    Join Date
    May 2008
    Location
    Cebu City, Philippines
    Posts
    41
    Hi,

    Correct me if my interpretation is wrong. You have two grills for vents? each vent is 300CFM? therefore you need 600CFM fan, just add 5% of the capacity for frinction loss.
    Or use frequency drive if you really want to hit exact 300CFM

    Regards,
    Morzy

  3. #3
    Join Date
    Sep 2008
    Location
    Western PA
    Posts
    25,433

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