Jet shop filter ok to run without filters?

[mac davis]

Good point... I'm looking at using a table saw DC fitting, which just covers the grill on the exhaust side, and running about 30" of 4" DC hose to the dryer vent, which would be near the ceiling..

We were originally going to use a bathroom type vent unit, but the hassle of running power to it just isn't worth it..

I'm thinking that the advantage of the Jet unit over the wall unit is that it's in the middle of the room, mounted on the ceiling and that it's already there.. (yeah, my middle name is either Lazy)

mac

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[mac davis]

Well, I've had a 10" box fan from Wally World running in a shop window for most of 2 years and it's getting a tad noisy.. lol

mac

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[mac davis]

AHHHH.... That's sort of the question that was hiding in the back of my mind when I asked if it could harm the unit! Brings to mind the folks that put low resistance mufflers on their cars and lose the back pressure that the engine might need..

mac

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[MikeWhy]

It's difficult to say without the fan curve to look at. For a finely tuned, engineered system, that may be so. I think that's hardly the case for "generic" air cleaners. Removing the static loss from the filter flattens the system curve, shifting the operating point lower and to the right: lower static pressure and higher cfm. Assuming constant speed and efficiency, power draw will be higher; the fan laws relate power to the cube of cfm. However, the squirrel cage likely is running higher on its efficiency curve at the lower static point. I doubt the small increase in power places the motor in any danger of burning out. But, again, it's difficult to say without looking at the fan and system curves. If that's a concern at all, my Jet filter has 3 speed settings. Just avoid using the highest setting.

[mac davis]

Yep... I'm guessing that you could just take the "squirrel cage" fan out of the filter and run it without problems..

Part of the reason for removing the filter is to not need to run it on anything but low (1 of 3) speed..

mac

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