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Old 09-05-2014, 06:54 AM
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Quiet Fans?

I need fans to move air in my shop and I have one of these:

and two of these:

plus one of these:


They are noisy.

I know that there have been big technology advances in radiator fans to improve air flow and reduce noise. Has anyone applied that technology to ventilation fans?

Are there any quiet fans for shop ventilation?

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Old 09-05-2014, 07:27 AM
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Fans

The fans in your photos appear to be direct drive (off motor). I have found that belt driven fans are much quieter due to having a different size pulley on the fan and the motor. I'm not sure that vent type fans are available as belt driven. Hope this helps.
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Old 09-05-2014, 08:28 AM
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Quote:
Originally Posted by Forty2door View Post
The fans in your photos appear to be direct drive (off motor).
The wall-mounted exhaust fan is belt-driven and is the quietest of the fans.

From what I recall, the fan noise (that helicopter-like noise) is from the air passing over the blade tips.
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Old 09-05-2014, 10:17 AM
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Quote:
Originally Posted by hduff View Post
The wall-mounted exhaust fan is belt-driven and is the quietest of the fans.

From what I recall, the fan noise (that helicopter-like noise) is from the air passing over the blade tips.
That's correct, and the round tip shaped blades were developed to quiet down the fan noise. They still move air well, but cut down the noise factor. Try to find fans with the rounded tips on the blades, and they'll be quieter. Grainger has a pretty good variety of fan styles. You'll notice anything labeled "quiet" has rounded tip blades.
Air Circulators - Circulating Fans - Grainger Industrial Supply
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Old 09-05-2014, 10:22 AM
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Originally Posted by 1971BB427 View Post
That's correct, and the round tip shaped blades were developed to quiet down the fan noise. They still move air well, but cut down the noise factor. Try to find fans with the rounded tips on the blades, and they'll be quieter. Grainger has a pretty good variety of fan styles. You'll notice anything labeled "quiet" has rounded tip blades.
Air Circulators - Circulating Fans - Grainger Industrial Supply

Wow! Not inexpensive.

I wonder if there is a source for the blades to retrofit existing fans.
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Old 09-05-2014, 10:26 AM
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Not sure, and you might take a look at a Johnstone Supply (if you have one). They sell components like blades. Might even check with Grainger for just the blades too, as they might sell that part separately. Just need to be sure you get the correct blade size and cfm rating, or you'll risk overloading the motor and tripping the circuit.
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Old 09-05-2014, 10:30 AM
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Quote:
Originally Posted by hduff View Post
The wall-mounted exhaust fan is belt-driven and is the quietest of the fans.

From what I recall, the fan noise (that helicopter-like noise) is from the air passing over the blade tips.
You are correct..it is the high tip speed that makes the noise so you need bigger fans that turn slower to move the same amount of air in a quieter fashion. You may wish to consider ceiling fans of the type we put in houses as a circulation fan.

Sam
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Old 09-05-2014, 11:04 AM
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Originally Posted by evolvo View Post
If your brave you could make a template of a round fan tip and then go ahead and cut yours. Just might work, give it a whirl!! (bad pun intended)
Yes, as long as the cuts were identical on each blade, it would most likely make it a bit quieter. Part of the quiet comes from round tips, but another is the sloping surface of the blade vs. flat surface slapping the air. So the modified tips will help, but not as quiet as a sloped blade with a rounded tip.
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Old 09-07-2014, 03:58 PM
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Quote:
Originally Posted by OneMoreTime View Post
You are correct..it is the high tip speed that makes the noise so you need bigger fans that turn slower to move the same amount of air in a quieter fashion. You may wish to consider ceiling fans of the type we put in houses as a circulation fan.

Sam
I do have four ceiling fans I removed as part of a remodel at my daughter's house. I don't know why that never occurred to me; I'll install them next week.

These temps in the 90s with high humidity are killing me.
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