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Exhaust fan for a large shop?

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StaggeringGoat

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I lease an industrial shop, about 40x60x16. I need some sort of exhaust fan to pull out the hot air in the summer and the fumes from various things. I may be able to cut a hole in the roof (steel) but I think I'd rather mount something on the wall up by the ceiling. In the end it's going to be up to what the owner of the building wants.

The question is, what kind of fan can I install, on the cheap? I want something BIG. I'm looking at gable mount and whole house attic fans at Home Depot. The gable mount type I could obviously mount at the top of the wall, with some sort of vent cover on the outside. This would be easy to cover in the winter.

On the other hand, I think a ceiling mounted fan would be better at removing heat and fumes. How do I mount a fan in the roof without it raining in the winter? I don't have an attic...

Anybody have some fans they want to recommend?
 
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StaggeringGoat

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pseudorealityx said:
Where is the make up air coming from?

What are the fumes coming from? Would a localized exhaust work better for that?
Click to expand...

The roll up door would be open when I have the exhaust on. Fumes could be from a lot of things...metal work...cars...sanding dust...the bathroom...though the biggest issue is the heat. I work mostly at night and it can be 60 degrees outside and 80 degrees inside with all the doors open.

How do I know how many CFM I need to get a good air turnover?
 
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pseudorealityx

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Like anything else, "it depends".

5-6 air changes is probably plenty for your situation. With 6 air changes, every 10 mins, you're bringing in all new air. For your shop, that would be 3200 cfm.

Put something on the outside of fan so that water can't get in when it rains when you're not running the fan. The last thing the owner is going to want is water damage. Either a weather hood, or louver. Weather hood is likely cheaper. Also, I don't recall the height requirement, but you might want to think about one of the motor guard options. Not because I think you'll stick your hand in the motor, but because it'll take some liability away from the landlord/owner. Make him feel a bit better. You can see the options on page 12 of that catalog.

If you've got the roll up door open when the fan is on, and a weather hood or louver to prevent water from coming in, you should be looking, AT MOST, at 0.20" of static. So look under that column when selecting a fan.

I have no affiliation to Greenheck, just a company I happen to like due to good products and workmanship. Comparable stuff could be from Penn-Barry or Cook. Dayton is what you'll likely find in Grainger, and they're fine too.

FWIW, these fans aren't exactly 'cheap'. The Dayton in the Grainger catalog retails at a bit over $800.

http://www.grainger.com/Grainger/DAYTON-Exhaust-Fan-7CC79?Pid=search

Also realize they won't be silent if you're moving that much air. The 'sone' rating is the sound level, so you can compare between fans.
 
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