Reply by CaptainKlutz

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Posted on Floor dryer as air cleaner

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1893 posts in 2006 days

#1 posted 01-12-2019 10:28 PM


Yes, it can work. Requires some thought on design.

1) That style of squirrel cage blower loses a lot of cfm as static pressure increases. It has massive airflow/cfm with zero intake restriction. As soon you add filters, the cfm drops quickly. In order to keep the cfm/efficiency high, and have best filtration, need to maximize the filter surface area/minimize the filter pressure loss as they get dirty. This is why this fan design in never used for wood working dust collection via duct work, but can be made to work as fine dust filtration box similar to project that OP posted above.

2) While above discussion on filter flow rates is interesting, it misses one point. Filter flow rate is irreverent except to know when to replace/clean the filter, or to insure low static pressure thru blower. Thorough air filtration requires understanding of air/dust circulation in room. Goal is to circulate the entire shop air around/through the filter assembly, not have highest intake pressure (so it vacuums the room – because it can’t).

3) Mounting location is huge quandary, and source of much debate. Best location for any air filtration is where the air is guaranteed to be flowing. In commercial filtration booths, they use down-draft or up-draft designs and pull all air thru grates, into ducts and filters which bring air back to opposite side of room. Side draft designs exist where either room or duct work is oval race track where a filter wall is created and 100% of air flows horizontally thru the filter wall and around other side of room.
Doing same thing in garage or basement wood shop is near impossible without huge budget.

So best you can hope for is to buy/build a air circulation box that fits into your space, and helps to cycle shop air around the room, filtering out small dust particles in process. Air filtration is a trial and error process even for the experts doing 3D simulations to create clean rooms.
Best Luck.

-- I'm an engineer not a woodworker, but I can randomly find useful tools and furniture inside a pile of lumber!

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