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Old 04-29-2016, 12:18 PM   #1
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Installing a Maxxair Fan 7500K

Hello fellow campers.

I plan to install a Maxxair 7500K fan to replace one of my vent covers in the kitchen. I have a 2016 Sierra 371 REBH. The fan looks easy to install on the videos found on the internet. However, my question is... How do I determine if I have nearby 12 volt wiring?

I don't want to remove the current vent cover only to determine I don't have 12 volt wiring to complete the installation of the fan.

Any help is greatly appreciated.
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Old 04-29-2016, 12:26 PM   #2
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Any lights within 2-3 feet?


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Old 04-29-2016, 01:20 PM   #3
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Any splicing involved?
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Old 04-29-2016, 01:25 PM   #4
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Any splicing involved?
Sometimes... and that is a big SOMETIMES... there just happens to be wiring at the vent location. Maybe not specifically for a fan but the wiring just happens to run through that area. But sometimes not.

In any case if there is a light within a couple of feet you can fish a wire to the light and run the fan from the light wiring.

Yes... it will involve splicing, fishing wires and quite possibly, curse words!
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Old 04-29-2016, 01:28 PM   #5
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I installed one in my TT in the front kitchen. There was a wiring run already there for me to splice into. I pulled the inside trim piece to check that before I ordered the fan.
The biggest hurdle was getting the existing vent out without destroying the roof.
It turned out to be a pretty tough job and I still worry that I will have a leak later on.
I admit sometimes I wish I hadn't done it.

Happy Camping
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Old 04-29-2016, 01:35 PM   #6
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Thanks. Helps alot.
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Old 04-30-2016, 11:04 PM   #7
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Removing the old

Be certain to use a heat gun to soften and help scrape off the sealant to avoid cutting into the roof whane taking off the old vent.
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Old 05-01-2016, 12:03 AM   #8
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I'm hoping the old vent is not stuck on too well, being a new 2016 model. Thank you though.
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Old 05-01-2016, 05:05 AM   #9
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I'm hoping the old vent is not stuck on too well, being a new 2016 model. Thank you though.
Oh you will see... It is really stuck on. I was very impressed with how well installed the vent was. You will also see how flimsy the roofing material is. The sealant is much tougher.

I would say the advice to use a heat gun is probably good.

I used a combination of eternabond tape and dicor sealant over the installed edges. So far so good.
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Old 05-01-2016, 06:45 AM   #10
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Yes, you will see. You will not be able to get all of the sticky stuff off, but don't need to. Be careful and don't punch a hole in the EPDM (or rubber). When going back on you will need butyl tape and it is very very sticky. When it sticks to itself, you can't get it apart. The trick is to keep it cool when working with it. The first time you accidentally let it touch itself, you will see. The other thing is to have a tube of the right color dicor so you can cover the joint where vent meets roof and the screw heads. Make it look like (or better than) the factory.

One of my vents locations had a cheap-0 fan, so the wire was there; the other wasn't wired. IMO, the factory should wire every vent location. I had to pick up B+ and ground from a nearby switch and light. The source you find... make sure it is "hot" all the time, not just when a light is on. You can work 12v "hot", it won't hurt you, but you might want to find a remove the fuse, so as not to blow it. If you see Romex nearby, that is 120vac... leave it alone!

While up there (be careful up there), give the whole roof a good looking over for bubbles and places for potential leaks. I found a few.

Oh, I love my two Maxxair vents. One of the best mods I can think of.


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