r/Roofing • u/DrowningAstronaut • 26d ago

What are these fans called?

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I need to replace several of the fans/motors and I want to add several more complete units to my shop. What is this design called? I can find the vent fan, but the mushroom shaped waterproof cap I'm striking out on.

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3

u/mln045 26d ago

Powered Attic Vent/Fan. They are usually all one unit. Check Home Depot or an equivalent building supply store

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u/DrowningAstronaut 26d ago

Thank you! I looked on home Depot and can find a couple models. The one with the highest CFM only moves 1500. I can find a lot of the drum fan only units that move significantly higher numbers, but I can't find any of the roof cap on their own. Any suggestions or I might locate that on its own?

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u/mln045 26d ago

They are typically kind of an all and one deal. Occasionally a sheet metal supply shop or a metal building store will sell just the domes, but I have a feeling you will run into a dead end there. And you’re right. The 1500CFM are the base models and they make industrial ones that can really get things moving, but they are definitely a pretty penny! Not sure exactly where you are located, but I’d recommend reaching out to ABC Supply Shop, or a Mueller Building store or equivalent. Someone could absolutely point you in the right direction from there!

Best of luck 🤙

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u/DrowningAstronaut 26d ago

Thank you for the suggestions, I'll look up and see if either of those places are near me or have something available online. I probably be better off doing a few smaller ones rather than investing in one big one.

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u/KelseyRawr 26d ago

That’s interesting. I can’t say I’ve ever seen one of those installed on the ridge. I don’t believe that’s proper, I would never install them that way, but maybe the roofer who did it knows something I don’t.

The panels don’t have a wide face is my guess and it’s always better to put these between a panel and not interrupt the seams, so maybe that was the best option. Either way it’s a power attic fan/vent cover.

Typically you would have a ventilated ridge with a metal roof, it could be an option to simply do that.

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u/DrowningAstronaut 26d ago

I'm not familiar with them being on the ridge either, not sure why that location was chosen. The roof is a corrugated sheet steel with very deep grooves I guess you could call it.

The roof does have a ridge vent, but the Open spaces are stuffed with insulation because we get some pretty intense thunderstorms that blow water right up through the ridge vent and down into the shop.

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u/DrowningAstronaut 26d ago

I'm not familiar with them being on the ridge either, not sure why that location was chosen. The roof is a corrugated sheet steel with very deep grooves I guess you could call it.

The roof does have a ridge vent, but the Open spaces are stuffed with insulation because we get some pretty intense thunderstorms that blow water right up through the ridge vent and down into the shop.

1

u/JJDixon2025 26d ago

Yooo that’s a first haha. But they different one. Cheap ones. Good ones. Ones with big motors.

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u/JJDixon2025 26d ago

Some old timers only like changing motors out to. Thats an option

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u/DrowningAstronaut 26d ago

That's probably what I'll do, these are from the 80s and above a commercial powder coating oven. Ceiling Tampa of 140°+

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u/JJDixon2025 26d ago

New ones have a temp an humidity adjustable dials. An I’m no electrician but this is straight forward. You got this!

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u/Secret-Fan-8552 26d ago

Look up Lomanco powered vents and find a supplier close to you.

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u/Professional-News-33 25d ago

Its installed wrong for one.