Small Shop Built Air Exchanger

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Project by Bullet posted 04-23-2009 12:19 PM 3163 views 18 times favorited 4 comments Add to Favorites Watch

Well, here’s my version of the shop built air exchanger. I used scraps I wood found at the local cabinet shop: Oak veneered MDF and walnut. I found a blower from a clothes dryer at the local appliance shop for free, a scrapped emergency stop, and I used an old extension cord for the power cord. The only things I purchased were the filters, some caulk for sealing the joints, and the air diffuser for the outlet. If you look through the diffuser you can see that I lined the air outlet with pink foam insulation – it helps to lessen the noise of the air rushing out. It’s really quiet.

It’s also small – 16×20x24”. So it’s easy to move around. I haven’t mounted it to the ceiling yet, so I move it to where I’m sanding something – it really sucks!

The blower is about 350 CFM, so it takes about 6 minutes to change all the air in my small shop.

-- Anything is possible when you have no idea what you're talking about.

4 comments so far

View MyOldGarage's profile


93 posts in 3449 days

#1 posted 04-23-2009 02:45 PM

Very nice. I’m looking at doing one myself and hadn’t thought too much on a dryer motor. I think I might have to look into one of those. Thanks for sharing—great job!

-- Bradley Miller, Blue Springs, MO -

View Bullet's profile


150 posts in 3351 days

#2 posted 04-23-2009 03:15 PM

It really depends on the size of your shop. Mine is a basement shop that’s 22×12’. Pretty small. I was trying to keep recirc at less than ten minutes and keep the box as small as possible – this does the job well.

-- Anything is possible when you have no idea what you're talking about.

View Jerry's profile


221 posts in 3560 days

#3 posted 04-29-2009 12:21 AM

I had not thought of a dryer motor either. Very good use of commonly discarded parts. Thanks for the ideas.

-- Jerry - Rochester, MN *Whether you think you can or you can't, you are probably right* - Henry Ford

View Don K.'s profile

Don K.

1075 posts in 3348 days

#4 posted 04-29-2009 12:39 AM

Very nice. I plan on building one for my shop and I stopped by my local heat and air shop today. (I have done lots of busines with them in the past) and asked if they had any extra squirl cage blowers laying around. They gave me two that came out of 5ton heating units. Probably way more than I need. But hey, free is free. I may use the other one for a down draft table.

-- Don S.E. OK

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