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 RogerRabbit
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Registered: 03/26/03
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Neither. Some chop the wave, and others vary the frequency. I'm not sure which method those use, but they're UL approved, and meet the requirements of the National Electrical Code article 430 for motor speed controllers.
RR
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Ignorance is contagious. Boycott Walmart and watch your IQ go up.
RR
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 orchidfanatic
retiree
Registered: 08/12/07
Posts: 832
Loc: where the wild things are
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 Re: Laminar Flow Hood (w/ pic) [Re: RogerRabbit]
#7900863 - 01/19/08 09:19 AM (11 months, 14 days ago) |
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Thanks RR I was concerned about overheating if run for long periods on
low speed.
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RogerRabbit
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Don't run any motor at less than 50% speed as it can ruin the windings and/or bearings.
RR
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www.mushroomvideos.com
Ignorance is contagious. Boycott Walmart and watch your IQ go up.
RR
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dumbfounded1600
Registered: 07/29/07
Posts: 2,163
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Re: Laminar Flow Hood (w/ pic) [Re: RogerRabbit]
#7909199 - 01/21/08 11:17 AM (11 months, 12 days ago) |
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need some help which type of HEPA should I look into
http://www.austair.com.au/Filters/hepas.html
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smokedout420
The EnlightenedOne
Registered: 12/16/07
Posts: 480
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orchidfanatic
retiree
Registered: 08/12/07
Posts: 832
Loc: where the wild things are
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Re: Laminar Flow Hood (w/ pic) [Re: RogerRabbit]
#7910788 - 01/21/08 05:41 PM (11 months, 12 days ago) |
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Quote:
RogerRabbit said:
Don't run any motor at less than 50% speed as it can ruin the windings and/or bearings.
RR
if thats the case why do they sell controllers that slow greenhouse fans down to 20% the literature with the speed controller said nothing about that .. strange...
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Anno
Experimenter
Registered: 06/17/99
Posts: 24,013
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Quote:
dumbfounded1600 said:
need some help which type of HEPA should I look into
http://www.austair.com.au/Filters/hepas.html
For instance http://www.austair.com.au/Images/PDF/Absolute.pdf
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The Rich Jerk
Grow Mushrooms from Spores - PF-Tek for Simple Minds
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RogerRabbit
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Quote:
orchidfanatic said:
Quote:
RogerRabbit said:
Don't run any motor at less than 50% speed as it can ruin the windings and/or bearings.
RR
if thats the case why do they sell controllers that slow greenhouse fans down to 20% the literature with the speed controller said nothing about that .. strange...
I was speaking from nearly 40 years of experience in the electrical trade, and I don't sell controllers. 
RR
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www.mushroomvideos.com
Ignorance is contagious. Boycott Walmart and watch your IQ go up.
RR
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D4NK
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Re: Laminar Flow Hood (w/ pic) [Re: RogerRabbit]
#7914394 - 01/22/08 11:57 AM (11 months, 11 days ago) |
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I was going to get one of these when I was thinking about making a flowhood. Pretty good price.
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Moderation is key
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orchidfanatic
retiree
Registered: 08/12/07
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Re: Laminar Flow Hood (w/ pic) [Re: D4NK]
#7916032 - 01/22/08 05:57 PM (11 months, 11 days ago) |
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that is the exact same filter I have .. I had to get a 500cfm @1" static pressure to make it work ...
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D4NK
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So if you were to do it again, you would go another route? Or am I misunderstanding you? I figured any 24x24x11.5 99.99% HEPA filter would have a really similar air resistance.
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Moderation is key
"There is no god higher than truth."
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RogerRabbit
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Re: Laminar Flow Hood (w/ pic) [Re: D4NK]
#7917943 - 01/22/08 11:07 PM (11 months, 11 days ago) |
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That seems like a great filter. As said above, you'll want a 500cfm @ 1" blower to handle it.
RR
--------------------
www.mushroomvideos.com
Ignorance is contagious. Boycott Walmart and watch your IQ go up.
RR
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orchidfanatic
retiree
Registered: 08/12/07
Posts: 832
Loc: where the wild things are
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Re: Laminar Flow Hood (w/ pic) [Re: RogerRabbit]
#7918896 - 01/23/08 06:50 AM (11 months, 10 days ago) |
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I have a ton of room in front of it and it works great on the orchid flasks .. its just I had to make sure I got the larger blower for it
and the box I made isnt easily portable .. it weights a ton .. I cant pick it up by myself .. well I did but I paid for it the next day or two.. a 12x24 would be alot more portable and easier to lift or move around is all .. but the work space is half the size..
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orchidfanatic
retiree
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Re: Laminar Flow Hood (w/ pic) [Re: D4NK]
#7918903 - 01/23/08 06:53 AM (11 months, 10 days ago) |
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Quote:
D4NK said:
I figured any 24x24x11.5 99.99% HEPA filter would have a really similar air resistance.
I would say yes .. similar Static pressure .. that one is .92 SP IIRC
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D4NK
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I just got a 1TDU2 for $120 recently. That'll work fine with that filter (24x24x11.5) I posted earlier correct? I'm hoping the blower isn't TOO strong. Then again, I can just block the intake a bit if the blower is too powerful right?
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orchidfanatic
retiree
Registered: 08/12/07
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Re: Laminar Flow Hood (w/ pic) [Re: D4NK]
#7936997 - 01/26/08 07:45 PM (11 months, 7 days ago) |
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yeah RR stated intake restrictions will slow it down
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dumbfounded1600
Registered: 07/29/07
Posts: 2,163
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For a 20 feet long...7 feet wide...11 feet high room...what type of hepa should I go with? I need helpa
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makaveli8x8
Stranger
Registered: 02/28/06
Posts: 7,033
Last seen: 22 hours, 49 minutes
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you should ask yourself what you want to do with it
I can't remember my exactly dimentions but i think mine is 24x32x4
its nice because you can do bags infront of it open them all the way up and have plent of room to hold a jar above it, and the length is really nice for setting jars and other equipment on the desk
one thing you should not underestimate if you make your own hood, is the design, the problem is it doesn't hit you untill you've already built it.
here's some tips if you do build your own
1. make sure you know where its going (permently) sounds like you have
2. make sure you design your desk/workspace
3. measure your doorways!!!
4. add the height of your stand, flowhood, blower, and anything above the blower (put it on paper make sure it all makes sense)
5. measure how tall your stand is going to be, then sit down on your chair and see if its at good working height.
6. lastly the thing that gave me the most trouble was the parts that the filter press against on the front, its hard finding a piece of wood thats like half a inch tall, so i cut it myself and it wasn't striaght, used it anyways and siliconed the hell out of it(it works but i wouldn't recommend it) i was trying to save money too
oh and make sure you find good wood to use, theirs alot out their and i found myself wondering the store like an idiot, i ended up getting glued aspine because it was cheap, then i found out why, you drop a piece on the ground and it falls apart
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We play on earth to pass the time 
Over-population the root of all Evil-brings the Elites Closer to the gates.
Edited by makaveli8x8 (01/28/08 06:04 PM)
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ohmatic
searcher
Registered: 02/28/04
Posts: 5,108
Loc: europe
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Re: Laminar Flow Hood (w/ pic) [Re: makaveli8x8]
#7958846 - 01/31/08 12:48 AM (11 months, 2 days ago) |
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 MONOTUB tek  HEATBOMB tek
#cultivation on irc.shroomery.org for real time cultivation chat
stay a minimium of 10 minutes after asking a question if you
actually expect someone to read and answer it !!!
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ZeropointMind
Stranger
Registered: 08/28/05
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Re: Laminar Flow Hood (w/ pic) [Re: ohmatic]
#7959030 - 01/31/08 02:40 AM (11 months, 2 days ago) |
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Right on! I need one for my smaller room, thanks a lot for that post!
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