Airflow/fan and filter

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Forum topic by b2rtch posted 07-20-2010 07:13 PM 943 views 0 times favorited 4 replies Add to Favorites Watch
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4822 posts in 2470 days

07-20-2010 07:13 PM

Topic tags/keywords: question

As I continue to build my new shop I have many questions.
Today the question is: is it easier for a fan to push or to suck air trough a filter?
Or does it make no difference?
The reason for my question is that ,as some of you already know, I want to install my dust collector and my air compressor in a small building adjacent but outside the shop but to have the air returning to the shop as to not waste conditioned air (warm or cool). As to not carry dust back in the shop with the air I want to returned air to be filtered (possibility through an HEPA filter) and to do so I want to assist the air flow with a fan.
My question is: should the fan be installed upstream or downstream of the filter or does it make no difference? (Downstream would keep the fan clean).
Thank you for your time.

-- Bert

4 replies so far

View lew's profile


11265 posts in 3177 days

#1 posted 07-20-2010 07:48 PM

Fans work best when the pull (suck) air thru a filter

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

View PurpLev's profile


8523 posts in 3070 days

#2 posted 07-20-2010 07:54 PM

a fan will have an easier time pulling the air from a filter than to push it through one.

so the fan should be downstream from the filter (workshop->DC->filter->fan->workshop)

-- ㊍ When in doubt - There is no doubt - Go the safer route.

View b2rtch's profile


4822 posts in 2470 days

#3 posted 07-20-2010 08:33 PM

Ok and thanks

-- Bert

View HokieMojo's profile


2103 posts in 3150 days

#4 posted 07-20-2010 09:19 PM

you’ve already got two answers from people that probably know more about this than me, but one point to keep in mind is that if it pulls air through the filter, it is filtered air traveling over the fins and motor. It might keep the unit cleaner and allow it to run longer.

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