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  1. #1
    Join Date
    Jan 2005
    Posts
    24

    Lightbulb

    I have a duct calculator and have researched the internet but can't find any reference to register size. The house I'm working on had 2"x12" registers in all rooms even the ones supplied with 8" duct. I've replaced them with 4"x12" in all rooms except the bath rooms. How do you size registers to be matched to sq. ft. and duct size?

  2. #2
    Join Date
    Feb 2005
    Location
    Alabama
    Posts
    534
    Are these floor or ceiling outlets? Most bathrooms don't require anything larger than 4x8, some need 10x6. Depends on the sq ft of the bathroom and the and the required CFM to cool the room.
    "If you can't fix it, don't break it."

  3. #3
    Join Date
    Apr 2003
    Location
    the Great Pacific Northwest
    Posts
    607
    Grill manufacturer litrature will give you all info, flow face velocity, noise, throw, and recommended range.
    2x12 how odd must have been on sale at wal-mart.

  4. #4
    Join Date
    Dec 2003
    Posts
    163
    4 x 12 = 48 / 144 = 3 x velocity = CFM's

  5. #5
    Join Date
    Jun 2000
    Location
    WYO
    Posts
    2,019
    2 X 12 floor very common. Lima register cal. Free sq. in. 16. face velocity 900. c.f.m.100, heating b.t.u. 9515, cooling b.t.u 2670 thro ft. 8 spread ft 14

    4 x 12 Fre sq in.30.0 face vel. 840 c.f.m. 175 heat btu. 13320 cool btu 4805 thro ft. 13 spread ft. 24

    never say never

  6. #6
    Join Date
    Feb 2003
    Location
    Huntsville,AL
    Posts
    4,125
    metal registers have much more free space than plastic ones -- I removed my new plastic ones, will use them as aux return grills from ea bdrm -- hallway side (sans sliding cover)

  7. #7
    Join Date
    Jan 2005
    Posts
    24
    Thanks for the info. The old registers were 2x12 baseboard registers.

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