Blower cfm

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Forum topic by bj383ss posted 02-17-2012 12:03 AM 1038 views 0 times favorited 2 replies Add to Favorites Watch
View bj383ss's profile


193 posts in 2360 days

02-17-2012 12:03 AM

Hello all. I recently acquired a free blower motor from a house HVAC. The blower has no markings. The motor is a 1/3 hp general electric. It has 3 speeds. Based on the size of the squirrel cage fan I found some where on the net that showed a cfm number. Can’t remember where I found it. Anyways it said mine was 1200 cfm. Do you think this is on high speed or low speed?

Thanks for your help. I used it to make a shopmade air cleaner.



2 replies so far

View crank49's profile


4030 posts in 2970 days

#1 posted 02-17-2012 01:07 AM

That would most likely be high speed.
If you make a shop air filter using that fan you might not see that much flow.
Those squirrel cage fans don’t have much capacity for pressure.
For a good air filter you need the very dense .5 micron type filters and they will stall the flow down to a much lower level. Should still work well though.

What it won’t do very well is serve as a blower for a dust collector or a cyclone. Those applications require too much pressure.

View hhhopks's profile


651 posts in 2376 days

#2 posted 02-17-2012 01:21 AM

Crank49’s answer got my vote.

-- I'll be a woodworker when I grow up. HHHOPKS

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