I'm trying to provide a solution for a restaurant I frequent. They always seem to get flies inside their light fixtures. We discovered after examining the fixture that there are 3 or 4 small holes on top which gives the flies direct access to the inside of the fixture. What can be used to prevent this by filling in the holes on top next to where the hang cord is?

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    Some kind of sticky tape? Silicone sealant? It's hard to say though without seeing a photo of the fittings. Don't block the holes if they are there for ventilation. – John Jun 17 '14 at 7:47
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    Some photos, or a link to a similar fixture would be helpful. Also, knowing the material which the holes are in might prove useful. Finally, it might be helpful to know if the holes are there to allow air circulation for cooling, and what types of heat the plugs material will have to cope with. – Tester101 Jun 17 '14 at 12:16
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    Ventilated cans must remain ventilated. Closing the holes doesn't convert them to closed can IC rating. – Fiasco Labs Jun 17 '14 at 15:34

You have to be careful here, because it's possible that those holes are there for ventilation, as John said.

So instead of trying to seal them completely, the absolute most you should do is cover them with some kind of mesh which will have holes small enough to keep out the flies but large enough to allow air flow.

A metal screen mesh - the kind used in making window screens - would be my choice for this.

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http://www.homedepot.com/p/Phifer-36-in-x-100-ft-Brite-Aluminum-Screen-3000031/100614699 ^^ one possible source

I recommend against vinyl or fabric which might add an insulating value that you should avoid.

To install, cut the mesh down so that it will cover each hole with a bit of an overlap and use a very thin bead of glue all the way around each hole to ensure that the screen is sealed over the hole.

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    This probably goes without saying, but make sure if you use a metal mesh that you don't damage the wires' insulation, possibly creating a short-circuit between them. – Martin Carney Jun 17 '14 at 17:48

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