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Offlinexburn
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Flowhoods plenum
    #4165789 - 05/12/05 11:16 AM (11 years, 6 months ago)

Ok i got my filter, it is 24x24x11.5 with 1 w.g. of resistance. I have a blower with rheostat control so it is variable speed. I need to know how large i must make the plenum on my box. thanks


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Invisibleagar
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Re: Flowhoods plenum [Re: xburn]
    #4165830 - 05/12/05 11:32 AM (11 years, 6 months ago)

The plenum is the enclosed area between the fans exhaust & the hepa filter that is pressurized by the cfm force of the fans exaust.

I don't quite grasp what you are asking.


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OfflineRogerRabbitM
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Re: Flowhoods plenum [Re: agar]
    #4165898 - 05/12/05 11:56 AM (11 years, 6 months ago)

A good rule of thumb is at least the same size as your filter. If your filter is 11.5 inches thick, then I'd make the plenum 11.5" as well. If it's too small, the pressure won't be able to eqalize behind the filter, which is necessary for laminar flow.

Hopefully, that is a variable speed motor control and not a rheostat. A rheostat will limit current and thus can only control speed on a DC motor. An AC motor's speed is determined by the frequency(hertz) of the applied voltage. You can get motor speed controllers here: http://www.littlegreenhouse.com/accessory/controls2.shtml
RR


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Offlinexburn
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Re: Flowhoods plenum [Re: RogerRabbit]
    #4166592 - 05/12/05 03:53 PM (11 years, 6 months ago)

RR got it, i was asking how big. I am however not good at phrasing things


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Offlinexburn
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Re: Flowhoods plenum [Re: xburn]
    #4166597 - 05/12/05 03:55 PM (11 years, 6 months ago)

i got one thats a variable speed motor that has three settings. Then i got one my friend said i could hook up to the rheostat he gave me to make it work


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Re: Flowhoods plenum [Re: xburn]
    #4168161 - 05/12/05 09:57 PM (11 years, 6 months ago)

Hopefully, what you're referring to as a rheostat is actually a three position switch. A three speed motor will have a common(usually white) and three colored wires, one for each speed. The switch will connect the 'hot' wire from your power cord to one at a time of those three wires, depending on the speed you select. I hope this helps.
RR


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Offlinexburn
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Re: Flowhoods plenum [Re: RogerRabbit]
    #4168629 - 05/12/05 11:53 PM (11 years, 6 months ago)

i have one that is like you describe, but then i have another blower that is designed to be hooked up to a rheostat to control the speed. My air conditiong guy hooked me up :P


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Offlinexburn
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Re: Flowhoods plenum [Re: xburn]
    #4168785 - 05/13/05 12:48 AM (11 years, 6 months ago)

ok This is what happened. I got a rheostat ( and i mean rheostat) Hooked it up to my what i assume to be an AC motor because it plugs into the wall. The fan is not a variable speed fan as i have one of those and this is most definatley not that. The rheostat after wired in runs then fan at different speeds. Am i correct in assuming DC motors are run off batteries or is it not like that?


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Re: Flowhoods plenum [Re: xburn]
    #4169164 - 05/13/05 02:34 AM (11 years, 6 months ago)

a rheostat is a device that restrains current flow.
if you have one that works on an AC motor, patent that SOB, and you will be a rich man :bow:


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Offlinexburn
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Re: Flowhoods plenum [Re: deanofmean]
    #4170133 - 05/13/05 11:18 AM (11 years, 6 months ago)

ok i must have a misconception on the difference between a DC and AC motor. How can i tell? WHat are the charecteristics?

The blower i did this on just has a lamp cord coming out of it for power. Put the rheostat in and it regulates the fan now. My question is how can i tell the difference between AC and DC in the future


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OfflineRogerRabbitM
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Re: Flowhoods plenum [Re: xburn]
    #4170495 - 05/13/05 01:08 PM (11 years, 6 months ago)

If it has a lamp cord and plugs into the wall, it's an AC motor. A rheostat will not control speed on an AC motor for long. It will burn out the motor. A rheostat is a variable resistor. It sounds like you have an actual motor speed controller if your air conditioning guy hooked you up. He would know the difference.
RR


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Edited by RogerRabbit (05/13/05 10:07 PM)


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Offlinexburn
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Re: Flowhoods plenum [Re: RogerRabbit]
    #4171978 - 05/13/05 07:36 PM (11 years, 6 months ago)

yeah it does have a lamp cord, so it is AC. My guy said it would work so he must have given me amotor controler but i swear it looks just like a rehostat


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Re: Flowhoods plenum [Re: xburn]
    #4172587 - 05/13/05 10:10 PM (11 years, 6 months ago)

Great! When you get it all together, adjust the motor so that when you place a cigarette lighter in front of the flowhood, it bends the flame over 90 degrees, but doesn't blow it out. That is the perfect setting.
RR


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Offlinexburn
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Re: Flowhoods plenum [Re: RogerRabbit]
    #4179076 - 05/15/05 06:29 PM (11 years, 6 months ago)

ok, i have it set it bends it but the flame moves around a little. like it is not 100% stationary is this ok?


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Re: Flowhoods plenum [Re: RogerRabbit]
    #4179077 - 05/15/05 06:29 PM (11 years, 6 months ago)

also what happenes if the flow is to great?


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Re: Flowhoods plenum [Re: xburn]
    #4179342 - 05/15/05 07:51 PM (11 years, 6 months ago)

The flame won't be totally stationary, but it shouldn't be waving back and forth either. Laminar flow means the entire surface of the filter has the same pressure behind it, thus the same flow through it. If the flow is too high, it can knock contaminants off your hands and other surfaces. Also, if the flow is too high, it causes turbulence in your room which also stirs up dust, etc. Another problem with too high of flow, is you move more air than necessary through the filter, thus clogging it up sooner. If you need to throttle the flow down even more than using your blower on low speed, simply restrict the intake a bit with a baffle such as foil. I also recommend getting a really good furnace filter as a pre-filter to extend the life of your expensive HEPA filter. Just duct tape a furnace filter over the intake to your squirrel cage fan.
RR


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Re: Flowhoods plenum [Re: RogerRabbit]
    #4180846 - 05/16/05 02:22 AM (11 years, 6 months ago)

thanks


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Amazon Shop for: HEPA Filter

Mushrooms, Mycology and Psychedelics >> Advanced Mycology

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