kinda OT squirrel cage blower ?

The motor cannot stand unrestricted air flow. The best thing to do is clamp an amp meter on the wire to get the amp draw down to the nameplate number. At the very least, block off one side of the squirrel cage. This should make it push air even better and the motor should run at a comfortable temperature. Blocking one side completely will probably get you to just slightly below the nameplate amp draw. I have had good luck by blocking one side with a piece of peg board.

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This is a single inflow and single outflow blower. But there was a restrictor plate of sorts on it, If I put this restrictor plate back on will it still be able to filter the air. It is a FASCO industries type U21B 3200 RPM 115ac motor

Searcher1

Ok, I put the restrictor plate back on and the motor is running cooler and it seems to be pushing just as much air, So I guess I could still use this as an air filter. I have it running right now just to make sure the heat does not build up I will go from there.

Searcher1

I did that a few years ago; we moved since, and I don't remember all the details. I used 3 filters in sequence. 1. A regular furnace filter, this collects the most dust but passes the fines. Two more stages, each progressively finer - these will almost never need to be cleaned, but check them now and then. I was quite happy with mine and my shop was in the basement with the laundry right there.

Steve