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Shop Air Filtration

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Project by rodneyh posted 1235 days ago 3222 views 18 times favorited 10 comments Add to Favorites Watch

I made this air filter yesterday afternoon. Was getting tired of breathing all that sawdust. The blower is from the downdraft of a kitchen range that we replaced a few years ago. Just couldn’t throw it away. It’s 1/8 hp, so it’s at about the point of a commercial filtration system in the 600-800 cfm range. The box was made of scrap plywood I had around. The big expenses were $20 for the coarse filter and another $20 for the fine filter, so I’m in a total of 20 bucks instead of $300 or so. The coarse filter is electrotratic and washable. It’s rated at MERV 8. I used almost all of the 25×20 filter by covering the top and both ends. The fine filter is a Shopvac HEPA filter. I believe it’s rating is 95% at 1 micron and 85% at 0.3 micron. I got really lucky as it slig snugly on the inlet to my blower (6”). The whole box is about 23×14 x 13, and weighs maybe 15 – 20 lbs. I was planning on ceiling mounting it, but it’s very convenient for moving around the shop as it is.





10 comments so far

View Ryan Bruzan's profile

Ryan Bruzan

148 posts in 1499 days


#1 posted 1235 days ago

Where did you get the filter material?

-- No matter how many factors go into thinking about a project, there is always one important new discovery to be made.

View shimster's profile

shimster

96 posts in 1610 days


#2 posted 1235 days ago

Does it work?

-- Less is More.....expensive

View rodneyh's profile

rodneyh

127 posts in 1268 days


#3 posted 1235 days ago

HardWood – both filters from Lowes

algale – I went back and forth between something like yours (MERV 12) and mine (MERV 8 plus HEPA). When I discovered the Shopvac HEPA slipped right on my blower, I was sold.

shimster – I know it’s pulling a lot of dust from the air, as the outer filters are pretty coated after just 1 day. I think the vac companies have the HEPA thing dialed in pretty well, so it likely works as advertised. As far a CFM, I don’t know right now, but I’ll come up with a way to measure it and update my entry when I do.

View NBeener's profile

NBeener

4806 posts in 1778 days


#4 posted 1235 days ago

Very nice job !

For whatever reason, I just think these are great projects :-)

-- -- Neil

View Brent Livingwell's profile

Brent Livingwell

73 posts in 2361 days


#5 posted 1235 days ago

Yep, you just saved my lungs as I have there seems to be a 1000 tools that i NEED before I can justify the much needed shop filter. I do have a fan just waiting for this.

Thanks, nice one.

-- Things of the greatest worth are from the Earth. If you tell yourself that something is "close enough" it is not...do it again.

View steliart's profile

steliart

1807 posts in 1292 days


#6 posted 1235 days ago

very cool project

-- Stelios L.A. Stavrinides: - I am not so rich to buy cheap tools, but... necessity is the mother of inventions - http://www.steliart.com --

View reedwood's profile

reedwood

858 posts in 1280 days


#7 posted 1234 days ago

We were just talking about making one of these no too long ago.

I was a little pessimistic because of several issues you seem to have addressed, and I’m prejudice because I already own a Jet air filter.
Yours came out real nice. Multiple washable filters, the hepa filter fits the intake, light weight. and cheap.
BTW – 20+20=40.00 had to tease you for that one. Still cheap!

The fan looks like it was made for this application with the exhaust tube. Nice air cleaner.

Are you going to try and put in a variable spd. switch?
You could plug it in to a remote controlled outlet adaptor too.

Good project. I’m now a believer!

-- mark

View rodneyh's profile

rodneyh

127 posts in 1268 days


#8 posted 1234 days ago

reedwood – No plan for a variable speed switch. I figure when I want filtering, I want as much as I can get. The noise level is not bothersome at all, even working within about 5’ of it. As far as a remote switch goes, right now I don’t really need it as it just sits on a bench. If I permanently mount it, I’ll likely go “remote” just by wiring it up to an outlet box and a couple 3 way light switches. I won’t have a remote control (that I know I’ll lose anyway) with a timer, but I can just mount the switches in a couple convenient locations in the shop.

View Sandy's profile

Sandy

137 posts in 2528 days


#9 posted 847 days ago

I just came across this project, as I have a blower motor from a furnace I replaced, so a full shop air filter is on the “to do” project list. Have you thought about using a wall mounted timer switch, like the kind used on Jacuzzis?

View neufeld15's profile

neufeld15

5 posts in 572 days


#10 posted 458 days ago

I like the 2 stage filter. we have a bigger version of this at my dads shop, but it’s just a coarse filter, but it does make a huge difference. Great work!

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