Ventilation

[TaylorS]

So on the new shop I installed 2 1000cfm louvered vent fans. They clear the air out fairly well but I was worried about weather proofing since they sit flush on the outside wall. I came up with using RV vent covers to install on the outside and keep the wind and the rain out. Put one on and it seems to have severely restricted flow of the fan can I cut the louvers out to increase flow or do I need to come up with another plan?


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[Winger Ed.]

A bigger fan is a simple solution, but also on some vents you can prop the vent slats open with a paint stick or something.
The fan won't use so much of its energy just to push them open. When done, pull out the prop & let them close their self.

[Barry54]

It is probably still a restriction if you cut the louvers out of the rv cover. Plus there’s flow losses for the 90° change in direction.

Is the inlet opening and discharge outlet of the cover equal size?

[country gent]

What about a set of shutters that can be opened and closed as needed? If you dont need the ventilation to control building temp and or humidity they might be an answer.Hinged they would swing open againnst the building closed they would cover the vent fan and latch.

[TaylorS]

The fans have shutters on them and I think a little flow loss would be ok but it’s definately not moving air with the covers as factory. It’s a 12” fan with a 12x12 square on the discharge side. The covers were made to sit flat on a RV roof so the space for air to move is fairly small. I’ll take some pictures in a few of the one I’ve installed and the other one that has not been installed might get a shower tonight I’ll check the north one before work see if it gets wet inside


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[TaylorS]

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[Barry54]

So if this is smaller than 12x12 it’s a restriction.

[ulav8r]

The metal roof above is probably in 3 foot widths. Get a 3 foot long piece and put one end under the overhang and extend it out over the fan. Put a support at the lower end on each side. 1/2" conduit or a lawn chair frame would make good supports. Then you could remove the louvers to reduce restriction, or remove the cover entirely and cover it with screen wire.

[MrWolf]

The metal roof above is probably in 3 foot widths. Get a 3 foot long piece and put one end under the overhang and extend it out over the fan. Put a support at the lower end on each side. 1/2" conduit or a lawn chair frame would make good supports. Then you could remove the louvers to reduce restriction, or remove the cover entirely and cover it with screen wire.

This. Looks like you are restricting the airflow.

[TaylorS]

So if this is smaller than 12x12 it’s a restriction.

Agreed the opening is probably 9x18 but those louvers change airflow a second time and it is almost completely blocking the forced air coming through the fan thinking I can cut the louvers and it will work fairly well. Just don’t wanna tear them up they are 40$ a pop.


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[45workhorse]

Cutting louvers, no screen, bugs would get in!
Unless I am missing something, which happens quite often!

[TaylorS]

The metal louvers are supposed to be there and push open when the fan forces air out so it would be mostly ok far as bugs go. Mostly worried about water damage cause I’ve seen it rain every which way and while this isn’t a super sealed up building, it sheds water.the covers should mostly protect the inside from weather even if the bottom side is cut out.


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[YoungGun88]

Make some small awnings to cover them. Awnings can have sides as well. Easy DIY project if you have the tools and know-how, plus if there are any leftover roofing materials you could use those.

Off-the-shelf options are out there as well, but they will hurt your wallet.

https://www.shanty-2-chic.com/diy-co...-metal-awning/

[HATCH]

I haven’t had any issues with my fan and I didn’t out the extra weather cover.
Calk really well when you install the fan and yiu will be fine

[TaylorS]

So I took a chance and just cut the vent out of the RV cover dam thing blows better than one that doesn’t have one on it now. Dawned on me that the louvers on the fan itself was shooting the air downward,so by cutting the vent holes out it provides full flow with less interference from the wind blowing directly on the louvers. I’ll take a picture tomorrow!


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[jsizemore]

A little hardware cloth will keep the bigger critters out. I built one that removed combustible vapors. I made a plywood door that covered the fan when not in use. The door was keyed to the switch so it couldn't close to the fully latched position when the switch was on.

[Bill M]

When I came home from the service, we bought a mobile home, the kitchen had a fan in the wall with a chain hanging inside. Pull the chain, and release it, the outer cover would open, and the fan would come on.
Also I saw one at Home Depot that had louvers that opened from the force of airflow.

[Rickf1985]

That is a gable vent fan the those louvres are designed to keep water out without the RV cover. Just let it go on its own and you will be fine. Are you casting out there in a hurricane? I don't see any caulk on the outside around the edges of the fan, that is all you need to weatherproof it.

[TaylorS]

That is a gable vent fan the those louvres are designed to keep water out without the RV cover. Just let it go on its own and you will be fine. Are you casting out there in a hurricane? I don't see any caulk on the outside around the edges of the fan, that is all you need to weatherproof it.

Hurricane force winds is a light breeze in the panhandle!


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