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Air Purifier Filters

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Forum topic by Brian024 posted 02-09-2009 03:52 AM 1085 views 0 times favorited 14 replies Add to Favorites Watch
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Brian024

358 posts in 2065 days


02-09-2009 03:52 AM

I’m thinking about building my own air purifier, since I don’t have the money right now to buy something like the Jet. Something like a 2 or 3 filter box unit, but I’m not sure what is the difference when it comes to filters. Would it be like a filter a respirator, being charcol is good and effective? I was looking through Sear’s site, gonna check a few more places, but found an electrostatic filter. Probably the goal would be to use 2 filters, the first to catch bigger particles and the second to catch the finer particles.


14 replies so far

View sry's profile

sry

146 posts in 2273 days


#1 posted 02-09-2009 05:08 AM

I’ve built one that I use when sanding, which is basically a box fan crammed into a plywood box with a few furnace filters on the end. I used two 20”x20” filters: one that’s the cheapest I could find at HD to trap the bigger stuff, and one that had the best allergen rating I could find (3M Filtrete Ultimate Allergen Reduction Filter). Total cost of materials is about $20, and it works pretty well. The first time I used it I was sanding some walnut and I was amazed at how dark even the outer filter got very quickly.

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Brian024

358 posts in 2065 days


#2 posted 02-09-2009 11:02 PM

Thanks Steve. I really wasn’t sure what the best way to go as far as filters would be. Like you, I would most likely use it for sanding and things like that. Plus I didn’t want to get to far and end up spending $50 on a filter at Sear’s that I couldn’t use.

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treeman

208 posts in 2115 days


#3 posted 02-09-2009 11:28 PM

Brian,

You might try to do a search on “Air Filtration” here on Lumberjocks. There have been lots of posts on air filtration units both home made and commercial. I posted a picture of one I built with a salvaged furnace blower and a plywood box. It worked pretty well.

I just completed a new one along the same vane but with a salvaged 4 speed furnace blower, a new plywood box and standard sized filters. If you will search my posts you will see more details.

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Brian024

358 posts in 2065 days


#4 posted 02-11-2009 11:30 PM

Thanks treeman. Right now I’m just getting ideas on how to do it. The first idea was to build it like the Jet, but after talking to one of the guys in my class today he said something about using an old exhaust hood or something like that.

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Craftsman on the lake

2390 posts in 2103 days


#5 posted 02-12-2009 03:14 AM

Like Sry, I too built one using a box fan with a furnace filter and a micron filter behind it. The furnace filter is bright blue. In a few days it is completely covered and brown, no blue at all. They come in packs of 10 for a few bucks so changing them is not a problem. The inner one stays fairly clean. I’ve also done a before and after check on my white drafting table on one side of my shop. Previously it had a fairly thick brown film on it in one day. Now it develops a barely thin film over days that doesn’t seem to get worse. So, I figure something is working.
I also have a standard 1.5 HP dust collection system so the big stuff is mostly getting sucked up too.

-- The smell of wood, coffee in the cup, the wife let's me do my thing, the lake is peaceful.

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jm82435

1280 posts in 2407 days


#6 posted 02-12-2009 09:50 PM

swing by a hvac shop they usually have lots of old fans from forced air furnaces heading for the dump. they make great blowers for air cleaners.

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

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Brian024

358 posts in 2065 days


#7 posted 02-13-2009 04:24 AM

Dan, I wasn’t sure if a furnace filter would work well enough but if I changed it as often as you did, I think it would.

I’ll definitely check that out Jm.

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Craftsman on the lake

2390 posts in 2103 days


#8 posted 02-14-2009 02:56 AM

Brian, I changed them today. The blue furnace filter on the outside was packed with dust. I had to be careful removing it to no dump it back into the air. Surprisingly the inside micron type filter was pretty dirty too. I brushed it off outside but I think I’ll be changing it more often. I did cut a piece of mdf recently too which I don’t do that often so that could be the culprit.

-- The smell of wood, coffee in the cup, the wife let's me do my thing, the lake is peaceful.

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Brian024

358 posts in 2065 days


#9 posted 02-14-2009 04:15 AM

Are you using a different kind of filter besides the furnace? Maybe I misread yor first post. That’s good to know because I’ve been having to cut a lot of MDF lately, eventhough I didn’t cut one bit of it in the shop. Usually braving the cold and cutting it outside.

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Craftsman on the lake

2390 posts in 2103 days


#10 posted 02-14-2009 04:59 PM

Brian, I’ve got two filters the inner one is a higher priced paper filter that looks like it’s folded like accordian ridges. It’s still for furnaces. The outer one is a typical furnace filter, a blue mesh stuff that catches a lot of the dust before it gets to the inner one.

-- The smell of wood, coffee in the cup, the wife let's me do my thing, the lake is peaceful.

View sry's profile

sry

146 posts in 2273 days


#11 posted 02-14-2009 05:01 PM

That’s exactly what I do as well. The outer filter cost something like $1 and gets the big dust so the inner more expensive filter lasts longer

View Brian024's profile

Brian024

358 posts in 2065 days


#12 posted 02-14-2009 05:56 PM

Ok, thanks guys. I’ve been trying to keep this as low cost as possible.

View MedicKen's profile

MedicKen

1599 posts in 2128 days


#13 posted 02-14-2009 06:10 PM

I have designed one, yet to be built, that will incorporate a K&N automotive air filter as the first filter to remove the bigger particles. It should work fairly well with the other 12×12 filters. The filter is for a toyota tundra, the nice thing about it is it will be washable and I only have to buy 1. The filter can be recharged with oil from K&N. I am not sure what the micron rating on the filter is, but hey why not give it a try and save a few from the landfill.

-- My job is to give my kids things to discuss with their therapist....medic20447@gmail.com

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Woodchuck1957

944 posts in 2429 days


#14 posted 04-02-2009 02:49 PM

I’m currently working on building one of these with a 4 speed furnace blower. I’m building the frame out of angle iron and it will be on casters. It will use two 16” X 20” pleated furnace filters, one on each side of the unit. So far I think it’s turning out pretty well.

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