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Microwave blower motor filtration

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Forum topic by onecarwallace posted 267 days ago 590 views 0 times favorited 7 replies Add to Favorites Watch
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onecarwallace

10 posts in 314 days


267 days ago

Topic tags/keywords: air filtration dust collection safety blower motor

Has anyone here ever tried making an air filtration system using the blower motor out of an over-the-range microwave, like this?

I found a post from someone that stated that he did it but there was no other info regarding the performance. All I can find on the subject is people using furnace blowers, which are probably a lot more powerful. Mind you, I’m in a one car garage so I don’t need that many CFMs to filter all the air.

Thanks!


7 replies so far

View crank49's profile

crank49

3336 posts in 1568 days


#1 posted 267 days ago

You could do better with a 20” box fan with a 20” x 20” furnace filter duct taped to one side of it.
Heck of a lot cheaper as well.

-- Michael :-{| “If you tell a big enough lie and tell it frequently enough, it will be believed.” ― A H

View rockindavan's profile

rockindavan

283 posts in 1233 days


#2 posted 267 days ago

I used a squirrel cage fan to clear the air from a small 6×6 make shift spray booth and it worked quite well. Getting an effective air cleaner however from one of those fans might not work as well as you hope. To be effective you need enough airflow to circulate the air around the shop in addition to pulling air through the filter. Anyways give it a shot if you have it sitting around. You should be able to swap it out with a bigger fan if it doesn’t work well.

View TopamaxSurvivor's profile

TopamaxSurvivor

14587 posts in 2273 days


#3 posted 267 days ago

I doubt it will move enough air.

-- "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

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onecarwallace

10 posts in 314 days


#4 posted 267 days ago

I was asking because I already have a microwave blower motor. My microwave died a while ago and I pulled it out before throwing the rest of it away, so no cost. I know this is unscientific, but it feels like it could be pulling more CFMs than a box fan. It’s small, but really powerful.

I actually built this setup but I feel like it isn’t doing anything. I have maybe about 8 inches of gap between the top of the filter and the ceiling so that the outlet air flow isn’t obstructed, but it probably doesn’t do too much in terms of actually circulating the air.

The plan was to see if I could build a better filter with the small blower motor before just buying an overhead air filtration system.

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TopamaxSurvivor

14587 posts in 2273 days


#5 posted 266 days ago

Let us know if it works.

-- "some old things are lovely, warm still with life ... of the forgotten men who made them." - D.H. Lawrence

View Tedstor's profile

Tedstor

1369 posts in 1230 days


#6 posted 266 days ago

I too think a range fan is too small to move significant amounts of air.

View b2rtch's profile

b2rtch

4286 posts in 1645 days


#7 posted 266 days ago

You need a lot of CFM, I know that such a small fan cannot deliver.

” Mind you, I’m in a one car garage so I don’t need that many CFMs to filter all the air.”
Wrong, you do need the big CFM to move all the air in your garage and not only a few inches around the fan

-- Bert

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