Sanding table

[Pop Pop]

I have acquired a squirrel cage blower from a hot air heating unit.  The HVAC guy I got it from says it produces aprox 1,100cfm. I am planing a sanding table around this blower.  I thought I would put the blower in a box like section of the cabinet that supports the table.

The table top would have openings leading to a plenum. The plenum would be ducted to a top hat separator of approximately 18" diameter, 6" high with a rectangular inlet (4.25"x6") and a 6" outlet.  The outlet would lead to another plenum containing a 10"x20"x2" pleated filter in front of two Clean Stream Hepa cartridge filters connected to the blower box.  The inlet to the separator would also contain a 1.5" tube that is connected to a RAS. 

The plan would be to house the tophat, filter plenum, and blower box in the cabinet that supports the sanding table. As I envision it, the separator would catch a large portion of the dust, the pleated filter would stop most of what gets past the separator, and the Hepa filter would get the rest.

Do you think the blower would move a sufficient volume of air to make this work?  Would a different diameter/height top hat work better?  Any thoughts?

Thanks

[retired2]

Squirrel cage fans might move cfm's comparable to DC systems, but unfortunately only at extremely low SP loads.  What that means is your furnace fan won't suck the fleas off your dog, and it won't work very well in the application you have planned for it.

[phil (admin)]

I agree w/ retired2.  I'd skip the separator and change plans to use one or two filters.

[Pop Pop]

Thanks for the feedback. I had some concerns about the ability of the blower to handle it.  I guess I will rethink it and make a downdraft table using two stage Winn filters.  I will connect my shop vac with your separator (my Frankinvac  ;D) to the RAS.

Thanks again, you saved me a lot of trouble.