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Community and Q&A

Are 48″ Baseboard Diffusers necessary?

MollyV| Posted inEnergy Efficiency and Durabilityon

Doing flooring and have pulled out the baseboard diffusers from 1959 house. They are 48″ long but the hole in the floor is only 2″ x 12″. Can I replace with a smaller size or is the 48″ length helping to spread the warm air around the room? Note that there are 2 of the 48″ diffusers along the same wall in the 14′ x 17.5′ living room.

Thanks in advance!

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Replies

  1. Expert Member
    Dana Dorsett||#1

    Are you talking about baseboards, or trench heaters with fin-tube? What are you calling "diffusers"? Is that the fin-tube?

    Trench heaters look like this, and are usually at least 3" wide, often 6-12" wide:

    https://cms.esi.info/Media/productImages/Turnbull_Scott_Engineers_Trench_heating_1.jpg

    Can you post a picture of what you're talking about (or find a web-picture and link to it)?

  2. GBA Editor
    Martin Holladay||#2

    Molly,
    If it is a register for a forced hot air system like the one in the photo below, you can probably get away with a smaller unit.

    .

  3. Jon R||#3

    Such a diffuser will reduce air velocity, causing the hot air to rise upward (useful under windows). Other designs move the air horizontally, increasing mixing and reducing stratification.

  4. MollyV||#4

    The diffusers are what Martin posted a picture of. Everything i can find says to buy them based on the cut out in the floor. The floor opening is 2" x 12" so I bought ones that fit that. No idea why a 48" long one would be necessary.

    Thanks all for your responses!

  5. Jon R||#5

    A 48" long one would be a good choice under a 48" window. Or get one with louvers that spread the discharge air.

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