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Old 04-05-2014, 09:57 PM   #1
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Ok to drill a hole through a roof support?

I am trying to wire a new vent fan from a near by light. However there is a roof support in between them and I'm unsure of how to get the wire past w/o drilling a small hole. Is that ok? Any other suggestions?
Thanks!
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Old 04-05-2014, 09:59 PM   #2
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I had to drill a hole in a cross member to run a new furnace wire from the A/C unit. It was the recommendation of the mothership to do it that way. I've seen no ill effects.

Edit: be sure to use a grommet in the drilled hole to protect the wire from chafing.
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Old 04-05-2014, 10:06 PM   #3
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Here's the thread about it:

http://www.airforums.com/forums/f44/...lp-111853.html
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Old 04-05-2014, 10:13 PM   #4
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I wonder if the light circuit and wire size to the lights can support the addition of the fan motor. The instructions for the fan may recommend the minimum wire and fuse size for the fan alone. Depending how many lights or other equipment on that circuit, you may be adding more current draw than the circuit can handle.
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Old 04-05-2014, 10:22 PM   #5
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Good point, Doug. I would try and identify everything on that circuit and ensure the circuit is robust enough. Furthermore, it wouldn't surprise me if there aren't wires already bundled and taped off for an optional OE fan. I have found that there are wires in my unit for everything I have added that were options not on mine at build.

Worth a call to AS.

I'm just guessing from the pic, but it looks like a 14ga white wire and a 16ga purple. Odd that they are different sizes...unless there is another power wire for the optional fan and a common ground.
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Old 04-06-2014, 12:01 AM   #6
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Thanks so much for the input!
Also there are roof supports on the sides of the vent hole. I pulled out some insulation and could find no wiring. I'm not sure how the harness goes back to the posterior lights.
Is there a phone number to the "home office" that could answer that question?
I have replaced the light fixture with LEDs shouldn't that help the circuit requirement?
Thanks again,
Newbie
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Old 04-06-2014, 07:40 AM   #7
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937-596-6111 ask for Dan or Randy.

The wire may be behind the cross member. Sometimes they're good at hiding them.
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Old 04-06-2014, 08:52 AM   #8
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Ok to drill a hole through a roof support?

The short answer is this, a small hole in the center of the beam should not make any meaningful difference in the strength of the beam.

By small I men a hole like 3/16".

A hole close to the edge of the metal will compromise the strength more than one more toward the center.
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Old 04-06-2014, 11:05 AM   #9
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JC said a 1/2" hole was fine...in center. They do it all the time...and some larger, the main ceiling harness on some models, for example.
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Old 04-06-2014, 11:09 AM   #10
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I didn't want to get too generous with the hole since I can't see how big the beam is to start with, I could see a 1/2 " hole not being a problem.
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Old 04-06-2014, 11:12 AM   #11
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I believe they are 1.5"...can't remember for sure.
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Old 04-06-2014, 11:22 AM   #12
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Ok to drill a hole through a roof support?

That would leave 2/3 of the beam intact, I doubt much support would go away with a 1/2 hole. The strength of these beams is in the edges and bends.

I would guesstimate that the beams in my 72 are about 2", perhaps tapering to 1 1/2" at the apex of the arch.
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Old 04-06-2014, 11:24 AM   #13
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Quote:
Originally Posted by J. Morgan View Post
That would leave 2/3 of the beam intact, I doubt much support would go away with a 1/2 hole. The strength of these beams is in the edges and bends.
And in a monocoque shell design the much of the strength lies in the inner and outer skin, with the outer being in compression and the inner in tension (in the case of the center of the roof).
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Old 04-06-2014, 11:26 AM   #14
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Agreed, the skins carry A LOT of the load, the majority by far.
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