Air Filtration System

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Blog entry by MikeGCNY posted 12-08-2010 11:32 PM 1932 reads 2 times favorited 7 comments Add to Favorites Watch

I planned on buying one of these, but I would rather spend the money on tools that directly impact the quality of my projects. I built this using an attic fan that I was given, some left over wood and a scrap piece of extension cord. I purchased the furnace filters (there are 3 of them in different MERV ratings), the hinges, the clasp, the electrical switch and box.

The only thing i need to do is build the blade guard on the exhaust side, add some eyes for hanging and then figure out where to hang it.

I have run it for several hours and WOW—these things make a huge difference in air quality.

7 comments so far

View HokieMojo's profile


2104 posts in 3694 days

#1 posted 12-08-2010 11:54 PM

It looks good. Just a note for consideration, make sure the fan moves enough air to actually cycle all the air in your shop frequently enough. You don’t want to get a false sense of security that it is keeping up with cleaning the air. I think that is why most people use a blower unit from an HVAC system. I don’t have any idea what an attic fan can move though, so it might be more than sufficient.

Regardless, it looks like some solid contruction. I mounted mine to a wall, but the eye hooks would have been nicer since I’d have spared some precious wall space.

View dbhost's profile


5705 posts in 3198 days

#2 posted 12-09-2010 12:21 AM

I tried the idea of making my own, but after stumbling across 10 too large blowers, and 4 or 5 dead blowers, I decided to give up and get a pre built one. Either way you go, an ambient air filter sure does make the shop nicer to be in!

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View jm82435's profile


1285 posts in 3708 days

#3 posted 12-09-2010 01:16 AM

Great project. I have a couple of these also. I am not sure there is such a thing as too large; did they inhale the filters? I have one about the size of a swamp cooler as well as one about this size.

-- A thing of beauty is a joy forever...

View longgone's profile


5688 posts in 3274 days

#4 posted 12-09-2010 01:54 AM

Nice job. You can never have too much clean air.

View Bureaucrat's profile


18339 posts in 3618 days

#5 posted 12-09-2010 02:41 AM

Hey Mike:
I made a similar box for a furnace fan and you’re right, it makes a ton of difference. I used eye hooks on the box and and hooks in the ceiling to hang mine. To dampen vibration I used 4 drive belts from a Eureka upright vacuum between the box and ceiling hooks. The belts are about 3/8” thick rubber belts that are about 6” long when stretched. The price was right as they were surplus from a former appliance that I had laying around. I don’t remember them costing much when I bought them originally. The box is dead quiet as far as any vibration.
Because I always think that something will go wrong with my projects, I also hooked a safety chain to each corner of the box…. just in case.
You have a nice project there, I hope it continues to work well for you.

-- Gary D. Stoughton, WI

View MikeGCNY's profile


44 posts in 3461 days

#6 posted 12-09-2010 03:52 AM

@Bureaucrat – thanks for the tip. I was wondering how i was going to keep the dining room from shaking.

@HokieMojo – The attic fan stated 1200 CFM. I am not sure how to measure it now that it is sucking air through 3 filters but i would say that there is a strong pull on the intake side when you put your hand over the filter.

@jm82435 – the filters are sandwiched between the exterior door frame and a 1×2 that is inset 1.5 inches from the opening.

View Eagle1's profile


2066 posts in 3030 days

#7 posted 12-09-2010 01:12 PM

Thanks for the post..

-- Tim, Missouri ....Inside every older person is a younger person wondering what the heck happened

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