Electronics > Mechanical & Automation Engineering

What sort of brushless motor to make an extractor fan?

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Simon:
You can get IP65 or more fans, used them no end, the 120W ones were not that high but their 65W versions were, just ordered one at work, 92mm fan that takes 40W and really does blow. The market is full of rugged small fans. What do you think cools all those servers, 12V, 24V, 48V take your pick.

thm_w:
I would not want to use a 11krpm Delta screamer anywhere near where I live or work.

It looks like there are some IP68 120mm fans on Digikey for not too unreasonable prices, as Simon indicated:
https://www.digikey.ca/en/products/detail/mechatronics-fan-group/MS1238E12B-FHR-2EM/9962917
1.2" H2O static pressure, 270 CFM.

I got this 140mm one to try for a HEPA filter (no water involved), 2" H2O, 330 CFM: https://www.aliexpress.com/item/1005003213526421.html

james_s:

--- Quote from: thm_w on May 13, 2022, 09:27:36 pm ---I would not want to use a 11krpm Delta screamer anywhere near where I live or work.

It looks like there are some IP68 120mm fans on Digikey for not too unreasonable prices, as Simon indicated:
https://www.digikey.ca/en/products/detail/mechatronics-fan-group/MS1238E12B-FHR-2EM/9962917
1.2" H2O static pressure, 270 CFM.

I got this 140mm one to try for a HEPA filter (no water involved), 2" H2O, 330 CFM: https://www.aliexpress.com/item/1005003213526421.html

--- End quote ---

"violent large air volume cooling fan"

I don't think I have ever seen a cooling fan described as "violent".

Simon:
I'm not really sure why the IP rating. I doubt the existing fan is IP68 rated. Plenty of air conditioning fans are not that highly IP rated. The air around us is always full of moisture. Just turned my dehumidifier on and it wanted to run even set at 90% but it's not like the room windows were all steamed up.

thm_w:

--- Quote from: james_s on May 13, 2022, 10:51:05 pm ---"violent large air volume cooling fan"

I don't think I have ever seen a cooling fan described as "violent".

--- End quote ---

Once you have these type of fans bare in front of you for testing, its not a bad descriptor. They can easily chop your fingertips off.

I like how they word the listings too, you can tell they don't want to deal with naive buyers:
"This is a super high speed fan with a monster performance. Because the speed is too fast, there will be some noise, please choose carefully!"

Hooked up to a low cost USA HEPA filter and still sucks like a hoover  through some 4" duct, total overkill. But thats where PWM input will come in handy.

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