best filter and size for shop made air filter

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Forum topic by randyb posted 02-23-2014 04:02 PM 1089 views 0 times favorited 2 replies Add to Favorites Watch
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119 posts in 3503 days

02-23-2014 04:02 PM

Topic tags/keywords: air filter

Hi guys, I have a furnace motor and fan unit which I plan on building an air filter. My question is, What is the most inexpensive, available, most effective filter for this project? I have no plans to build from and I need to be careful with the weight as to not bring down my roof. Any help would be appreciated. thanks

-- I was going for that distressed look

2 replies so far

View Fred Hargis's profile

Fred Hargis

5143 posts in 2669 days

#1 posted 02-23-2014 04:21 PM

I wound up using a 20×25, not for any reason other than that’s the size box I needed to build to accommodate the blower I had. It was heavy, but not “bring down the roof” heavy…something on the order of 120# (+/-). I used 3 filters, the first being a cheapie for pre filtering, the second being a Filtrete red, and the last one a Filtrete Ultra-Allergen. The shop I had at the time had 9’ ceilings, so the 20” box wasn’t a problem, it would be in my current shop with 8’ ceilings.

-- Our village hasn't lost it's idiot, he was elected to congress.

View Bluepine38's profile


3379 posts in 3261 days

#2 posted 02-23-2014 08:11 PM

You forgot to mention how big the fan is and how much air it can move. If you use a small filter with a big
fan, it will just get sucked towards the fan as it gets loaded with dust. Some people has used several filters
located on several sides of their box to keep the size down and still move enough air.

-- As ever, Gus-the 79 yr young apprentice carpenter

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