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  1. #1
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    DQ

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    Air Cleaner Fan Speed

    Weird question perhaps.

    I got a furnace blower motor to build an air cleaner (which will also be the cart for my planer). Basically going to build a box with removable air filters on three sides and an exhaust on the fourth side. The motor's wiring diagram shows that it actually has 4 speeds and can be wired to a 4-way switch for accessing all four speeds, or alternatively I can just use a regular light switch and decide which speed I want. The motor says RPM 1075/4SPD so I assume 1075rpm would be the "high" and each of the other speeds progressively slower.

    At first I assumed I'd just wire it up to top speed but the more I thought about it I wondered if a lower speed would actually be more effective/efficient for this application. Anyone made one of these for the shop? Any insight on fan speed or am I splitting hairs and it probably doesn't matter? Or should I go get a 4-way switch and just play around...?

  2. #2
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    Bill Clemmons's Avatar
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    Re: Air Cleaner Fan Speed

    I have two of those in my shop, but neither one is variable speed. Frankly, I don't know what speed either one of them runs at. As long as the suction is strong enough to pull air through the filters, I'd say you're okay. The exhaust may be more of an issue than the intake. Depending where the clean air exits the box, and what is in front of it, you may not want too strong a breeze blowing things around in your shop. I have both of my exhaust deflected down toward the floor.
    I'll gladly tell you how I do something. Just please don't confuse that with the right way to do it, and almost certainly not the only way.


  3. #3
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    Re: Air Cleaner Fan Speed

    Go with the 4-way switch. The flexibility will be nice in the future and it allows you to do some experimenting. Sometimes it's nice to turn those air cleaners down just so they don't make so much noise.

  4. #4
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    Rick M's Avatar
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    Re: Air Cleaner Fan Speed

    If it's like most blower motors you need to cut power before changing speeds, unless it was designed to change speeds on the fly.

  5. #5
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    Re: Air Cleaner Fan Speed

    For the reasons mentioned by Bill, I prefer a ceiling mounted air cleaner. I use mine to both clean air, and circulate heat and AC around the shop. Built it my self. It has a pleated outer filter, and a HEPA inner bag filter. HEPA bag filter was bought from Grainger.

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