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Solidcell
tolerance++;


Registered: 01/20/06
Posts: 754
Loc: Memphis & 53rd
Last seen: 15 years, 4 months
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Glove Box Construction (Fan Issue) *PICS*
#5350268 - 02/28/06 04:59 PM (17 years, 10 months ago) |
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Here's the filter part of my Positive Pressure GB:

And here is the back with the fan blowing in:

The problem is, the filter seems to resist the air flow causing the air to blow out of the fan the wrong way (it's just bouncing off the filter), so you can barely feel any air coming into the GB, but a ton of air coming off the fan the wrong way. The 49er Tek didn't cover much on fans, so is this normal, what should I have done differently? It's all sealed with RTV so anything can be taken off if need be.
-------------------- Psychedelic Jar Project "It is dangerous to be right when the government is wrong." -Voltaire "Everything that I accepted as being true up to now I acquired from the senses or through the senses. However, I have occasionally found that they deceive me, and it is prudent never to trust those who have deceived us, even if only once." -Descartes
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mikeownow
Humungus fungus

Registered: 09/01/05
Posts: 2,856
Loc: WA,USA
Last seen: 17 years, 3 months
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Re: Glove Box Construction (Fan Issue) *PICS* [Re: Solidcell]
#5350279 - 02/28/06 05:02 PM (17 years, 10 months ago) |
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I read that still air is better.
-------------------- No statements made in any post or message by myself should be construed to mean that I am now, or have ever been, participating in or considering participation in any activities in violation of any local, state, or federal laws. All posts are works of fiction.
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Solidcell
tolerance++;


Registered: 01/20/06
Posts: 754
Loc: Memphis & 53rd
Last seen: 15 years, 4 months
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Re: Glove Box Construction (Fan Issue) *PICS* [Re: mikeownow]
#5350282 - 02/28/06 05:04 PM (17 years, 10 months ago) |
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With the amount of air coming thru, it's pretty much still air. I haven't heard any good reasons for still air over +Pressure other than people just saying they prefer it. +Pressure makes more sense IMO.
-------------------- Psychedelic Jar Project "It is dangerous to be right when the government is wrong." -Voltaire "Everything that I accepted as being true up to now I acquired from the senses or through the senses. However, I have occasionally found that they deceive me, and it is prudent never to trust those who have deceived us, even if only once." -Descartes
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HippieChick
Chicks can do it too!


Registered: 02/20/05
Posts: 5,958
Loc: Midwest
Last seen: 3 years, 13 days
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Re: Glove Box Construction (Fan Issue) *PICS* *DELETED* [Re: Solidcell]
#5350292 - 02/28/06 05:07 PM (17 years, 10 months ago) |
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Post deleted by HippieChickReason for deletion: .
-------------------- Peace,Love and Happiness HC Freedoms just another word for nothing left to lose.............. I LUV My Greenhouse http://www.shroomery.org/forums/showflat.php/Number/5545848#5545848 My First Pans http://www.shroomery.org/forums/showflat.php/Number/6212058#6212058
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Solidcell
tolerance++;


Registered: 01/20/06
Posts: 754
Loc: Memphis & 53rd
Last seen: 15 years, 4 months
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Re: Glove Box Construction (Fan Issue) *PICS* [Re: Solidcell]
#5350324 - 02/28/06 05:17 PM (17 years, 10 months ago) |
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Aw man, I saw a good looking GB with it the other way around. Bummer, now I gotta run out and get more RTV or epoxy. I guess I'll go epoxy if I'm gunna be buying more. Thanks HippieChick!
-------------------- Psychedelic Jar Project "It is dangerous to be right when the government is wrong." -Voltaire "Everything that I accepted as being true up to now I acquired from the senses or through the senses. However, I have occasionally found that they deceive me, and it is prudent never to trust those who have deceived us, even if only once." -Descartes
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RogerRabbit
Bans for Pleasure


Registered: 03/26/03
Posts: 42,214
Loc: Seattle
Last seen: 11 months, 3 days
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Re: Glove Box Construction (Fan Issue) *PICS* [Re: HippieChick]
#5350337 - 02/28/06 05:21 PM (17 years, 10 months ago) |
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Agreed. By trying to push the air, you are attempting to build static pressure, and blade fans simply stink at building static pressure. That's why hvac units and flowhoods always use squirrel cage fans.
The still air/posi pressure debate centers on the amount of turbulence created by the fan. Any contaminants in the box, and there will be contaminants, will be blown about by the fan, giving them a greater chance of landing in your jars or petri dishes than they would otherwise have in a still air box. Personally, I prefer a flow hood(who wouldn't?) but my glovebox is still air. RR
-------------------- Download Let's Grow Mushrooms semper in excretia sumus solim profundum variat "I've never had a failed experiment. I've only discovered 10,000 methods which do not work." Thomas Edison
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Robert95z
Stranger
Registered: 02/23/06
Posts: 4
Last seen: 12 years, 2 months
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Re: Glove Box Construction (Fan Issue) *PICS* [Re: HippieChick]
#5350528 - 02/28/06 06:22 PM (17 years, 10 months ago) |
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Quote:
HippieChick said: If you are going to do a posi-flow , you need to pull the air through the filter , not push it through

Do you have more pictures of this setup
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HippieChick
Chicks can do it too!


Registered: 02/20/05
Posts: 5,958
Loc: Midwest
Last seen: 3 years, 13 days
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Re: Glove Box Construction (Fan Issue) *PICS* [Re: Robert95z]
#5350535 - 02/28/06 06:23 PM (17 years, 10 months ago) |
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In my Gallery under Glovebox.
Peace,Love,Happiness and Harmony Hippie Chick
-------------------- Peace,Love and Happiness HC Freedoms just another word for nothing left to lose.............. I LUV My Greenhouse http://www.shroomery.org/forums/showflat.php/Number/5545848#5545848 My First Pans http://www.shroomery.org/forums/showflat.php/Number/6212058#6212058
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agar
old hand


Registered: 11/21/04
Posts: 9,056
Loc: Somewhere Else
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Re: Glove Box Construction (Fan Issue) *PICS* [Re: Solidcell]
#5350873 - 02/28/06 08:11 PM (17 years, 10 months ago) |
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My G/B is STILL AIR. I don't use it often, as I have a F/H.
 When I do use the G/B. It is for VERY critical things.
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