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OT--HVAC Blower for Shop--CFMs???

J

Jiles

Well-known Member
I have a special application for this blower. It has a 115V 1/4hp direct drive with 10.5" x 4.5" squirrel cage with a max. speed of 1,075 rpm. It is a four speed motor.
Does anyone know the app. CFMs for this blower with it hooked up for the lowest rpm?
What would it be at Max. rpm?
Some stickers---tags-- are missing.
 
Go to grainger.com. They sell a lot of blowers and you might find one close to your size and see the spec. A blower will over amp with no ductwork or restriction on the air flow. Cfm will vary with appication. DH
 
Can't give an exact CFM rating but I will say those blowers move alot of air for their size. That said DH's comment about them not liking to work with no backpressure is correct in most instances. I say 'most' because I've got an old one in my shop that will run all day with no problems and the discharge on it is wide open. On the other hand Dad had a larger one some years back that would trip the safety on it after about 5-10 minutes of use. We wound up putting about a 4 inch strip across the top of the discharge to add some backpressure and it ran from them on with no problems.
 
(quoted from post at 08:13:28 08/31/11) Can't give an exact CFM rating but I will say those blowers move alot of air for their size. That said DH's comment about them not liking to work with no backpressure is correct in most instances. I say 'most' because I've got an old one in my shop that will run all day with no problems and the discharge on it is wide open. On the other hand Dad had a larger one some years back that would trip the safety on it after about 5-10 minutes of use. We wound up putting about a 4 inch strip across the top of the discharge to add some backpressure and it ran from them on with no problems.
Click to expand...

Yes, I've got one that I had to partially restrict the discahrge just to keep the motor from getting hot and sutting down. I've got another one that will run all day long just fine but does seem to move more air if the intake side is partially restricted.
 
Under 500 & depends on back pressure. You can avoid the unrestricted over temp motor problem by either restricting output (normal duct back pressure) or by restricting the inlet.
 
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