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  1. #1
    Join Date
    Jul 2014
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    Default Sealing Ceiling Fan Electrical Box

    We recently installed new electrical boxes and hung fans from them. We caulked around the boxes to seal off airflow into the attic. There are several small holes (and one has a medium sized hole) on the boxes. What's the proper way to seal this off to prevent the blown-in insulation from falling through the hole into the box (a fire hazard I presume)? Is caulking them appropriate or just putting a piece of electrical tape over the holes?

    Thanks

  2. #2
    Join Date
    Sep 2012
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    Boston
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    Default Re: Sealing Ceiling Fan Electrical Box

    the proper way is to install a cap in the attic over the electric box. the easy way is to make one out of metal duct tape and rigid foam insulation.

    i hope you installed the electric boxes that are rated to hold ceiling fans. if you installed old work boxes it would be very wise to change them.

  3. #3
    Join Date
    Dec 2010
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    Houston Texas
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    Default Re: Sealing Ceiling Fan Electrical Box

    If the holes are large enough to allow insulation through, something is wrong. Were extra punch out holes opened that don't have wire through them ?

  4. #4
    Join Date
    Jul 2014
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    Default Re: Sealing Ceiling Fan Electrical Box

    MLB Construction, what sort of cap? The boxes are mostly enclosed on all sides except the side that hangs down to go to the ceiling fan.

    HoustonRemodeler, The boxes and accompanying braces are rated for ceiling fans. The holes are not huge, about the size of a screw head and there is a bit of space around the grommet that allows the wire to go in. Just was curious if those posed a hazard for very small pieces of insulation or dust or anything. And if so I should do anything about them. Ill check again, but I also remember a hole that was a bit larger...

    Thanks for your responses.

  5. #5
    Join Date
    Jul 2010
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    6,381

    Default Re: Sealing Ceiling Fan Electrical Box

    I think MLB misunderstood your posting and thought the boxes are not in use.

    Anyway, a black electrical tape should be able to take care of those tiny holes.

  6. #6
    Join Date
    Jul 2014
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    Default Re: Sealing Ceiling Fan Electrical Box

    ok thanks dj1. I assume there should be no heat concerns with that or anything?

  7. #7
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    Default Re: Sealing Ceiling Fan Electrical Box

    no heat concerns as there is no heat source other than from the attic.

  8. #8
    Join Date
    May 2008
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    Pacific Northwet
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    Default Re: Sealing Ceiling Fan Electrical Box

    If the blown-in insulation is fiberglass, there is no short-circuit or fire hazard concern.

    Sealing the boxes should be done to block airflow for the purpose of energy efficiency**. Cheap adhesive caulking ($2/tube) works just fine for this.

    Insulation can safely come in contact with standard electrical boxes. Only recessed lights that are not rated for direct contact with insulation require an additional box around the fixture for energy efficiency and to prevent insulation contact.

    **Regarding energy efficiency: in the summer, it keeps cold air in and warm air out. In the winter it keeps warm air in and cold air out.
    The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.

  9. #9
    Join Date
    Jul 2014
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    5

    Default Re: Sealing Ceiling Fan Electrical Box

    Thank you for the advice.

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