Shop-made Air Filtration System (1500 cfm; ACH 20)

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Project by ChuckM posted 01-18-2021 10:59 PM 835 views 2 times favorited 4 comments Add to Favorites Watch

Supplies: Furnace blower (second hand); scrap ply
Consumables: Pre-Filters – Merv 5 (MPR 300) & MERV 7 (MPR 600); Filters – Merv 11 & 12 (MPR 1000 & 1500)

Key parameters:

Furnace blower: Rated for about 1500 cfm
Air changes per hour (2 car-garage; 8’ ceiling): 20 (6 is the recommended minimum number)
Noise Level: About 80 dB at exit; 60 dB at workbench (NIOSH recommended exposure limit is below 85)


An example for comparison with a commercial system:

-- The time I enjoy wasting is not time wasted

4 comments so far

View woodbutcherbynight's profile


7776 posts in 3420 days

#1 posted 01-19-2021 01:28 PM

Creative build. Makes a big difference in shop. Nice work!!

-- Live to tell the stories, they sound better that way.

View BigMig's profile


580 posts in 3625 days

#2 posted 01-19-2021 03:48 PM

Happy lungs, for sure!

-- Mike from Lansdowne, PA

View LesB's profile


2872 posts in 4455 days

#3 posted 01-19-2021 05:38 PM

Looks good.

Quite similar to one I built many years ago. I put mine on casters so I could move it around and closer to the source of air born dust. The top serves as my sharpening station, grinder and slow speed sharpener, etc. It also serves to blow the heated air from my wood stove around the shop.

-- Les B, Oregon

View TheOCDmaker's profile


24 posts in 23 days

#4 posted 02-08-2021 01:44 PM

nice. been trying to figure out how to deal with dust collection in my tiny new shop. i like that you built this cheaply and used it for storage also. thanks for sharing

-- AL, The OCD Maker, http://www.

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