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Offlinemushpunx
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Re: Repeated failure with flow hood [Re: Cue]
    #22477299 - 11/04/15 04:39 PM (8 years, 2 months ago)

Do  you have the specs on the blower?

Check for leaks, maybe check over your silicone if you used it. Try using a burning incense stick to check for leaks

How does flame test hold up? 

Try maybe putting some blank plates around for a few minutes opened up and watch them, see if antthing grows :shrug:


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Invisiblemicelio
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Re: Repeated failure with flow hood [Re: Cue]
    #22477328 - 11/04/15 04:46 PM (8 years, 2 months ago)

Quote:

Cue said:
My hood consists of an astrocel I, 2x2, with a Dayton 1TDT5





Technical Specs for your blower..

Dayton Model 1TDT5 Blower 975 CFM 1020 RPM 115V 60hz.
http://www.grainger.com/product/DAYTON-Rectangular-OEM-Blower-Without-1TDT5?s_pp=false&picUrl=//static.grainger.com/rp/s/is/image/Grainger/1TDT4_AS01?$smthumb$Dayton%20Model%201TDT5%20Blower%20975%20CFM%201020%20RPM%20115V%2060hz.

CFM @ 0.000-In. SP 965
CFM @ 0.100-In. SP 950
CFM @ 0.200-In. SP 910
CFM @ 0.300-In. SP 850
CFM @ 0.400-In. SP 820
CFM @ 0.500-In. SP 750
CFM @ 0.600-In. SP 710

You need to find out the sp (static pressure) of your filter to produce a laminar flow.
My filter is 24'x24'x6".. filter from Fungi Perfecti.
For that filter I need almost 1.000-in.sp to end up with 400 cfm.
Anything under 400 cfm. you would not have a laminar flow.
Without laminar flow your outlet air could have uneven velocity and that would cause an eddies that would suck in contaminates.
Without laminar flow you would have to work right up against the filter.
Your blower is putting out 710 cfm. at .6-inches. and the specs. doesn't  go lower than .6 sp..
It's very important to know the specs. of your filter before buying a blower..

Just my two cents.. I'm not an engineer and it's very possible I don't know what I'm talking about..

:cookiemonster:


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OfflineCue
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Re: Repeated failure with flow hood [Re: micelio]
    #22477572 - 11/04/15 05:46 PM (8 years, 2 months ago)

astrocel I is 0.9" resistance . Looks like the 1tdt5 is just barely below 400 at that resistance


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OfflineCue
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Re: Repeated failure with flow hood [Re: Cue]
    #22477582 - 11/04/15 05:50 PM (8 years, 2 months ago)

As for the flame test, I can't keep a lighter lit in front of the hood. There's so much flow going through it goes to about 90 degrees for a second or so before it blows out


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Re: Repeated failure with flow hood [Re: Cue]
    #22477656 - 11/04/15 06:11 PM (8 years, 2 months ago)

I see that the flow does drop off dramatically however. At .96 it's closer to 200. Does anyone have any suggestions on fans?


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OfflineCue
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Re: Repeated failure with flow hood [Re: Cue]
    #22477719 - 11/04/15 06:28 PM (8 years, 2 months ago)

Or rather, if I get a blower that's throwing 1040 CFM at .8", will dialing it down with a speed control be enough?


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Invisiblemicelio
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Re: Repeated failure with flow hood [Re: Cue]
    #22477843 - 11/04/15 06:56 PM (8 years, 2 months ago)

You could always close off the intake to the blower a little with cardboard or something to get the ideal 45 degree flame angle..

Some motors don't do well with speed controllers..

Is your filter 6" or 12" deep?


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Edited by micelio (11/04/15 07:00 PM)


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OfflineCue
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Re: Repeated failure with flow hood [Re: micelio]
    #22477886 - 11/04/15 07:06 PM (8 years, 2 months ago)

12". I'm just trying to get all the bases covered before I order another blower. I was looking at the Dayton 1tdu2, but it seems like I'm going to be slicing down a lot of that intake to get it closer to 400cfm at 0.9".

Thoughts? Is this the likely root of the problem?


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Invisibleblindingleaf
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Re: Repeated failure with flow hood [Re: Cue]
    #22477928 - 11/04/15 07:17 PM (8 years, 2 months ago)

Quote:

Cue said:
I see that the flow does drop off dramatically however. At .96 it's closer to 200. Does anyone have any suggestions on fans?



Quote:

Cue said:
As for the flame test, I can't keep a lighter lit in front of the hood. There's so much flow going through it goes to about 90 degrees for a second or so before it blows out




if ur blower is blowing less than half of what is recommended, how is it blowing the lighter out?

12" filters have less resistance than 6" filters as i understand it.  it is the same amount of filter material as a 6", just stretched out, so resistance decreases.
like if u put 1 lb of feathers inside a straw and tried to blow thru it, then put 1 lb of feathers into a pvc pipe and blew thru it.
its the same amount of material that is resisting, but the area that material is in has enlarged.
thats what i gather anyway….


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OfflineCue
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Re: Repeated failure with flow hood [Re: blindingleaf]
    #22477964 - 11/04/15 07:25 PM (8 years, 2 months ago)

Beats me. Unless the astrocel 1 specs are wrong. It's seems odd to me as well, but there's no way that I can keep the bic lighter lit within 3-4" of the face of the filter. If I stick 2 prefilters in front of the intake it slows the flame down enough to stay lit (maybe about 60 degrees) but looking at the math, that would reduce the slow to something really low.


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Invisibleblindingleaf
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Re: Repeated failure with flow hood [Re: Cue]
    #22477997 - 11/04/15 07:30 PM (8 years, 2 months ago)

where does the filter say it has .96" resistance?  on the actual sticker on the filter?


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OfflineCue
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Re: Repeated failure with flow hood [Re: blindingleaf]
    #22478006 - 11/04/15 07:33 PM (8 years, 2 months ago)

The filter actually says .9", the .96" was from the Dayton spec sheet for the fan


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Invisibleblindingleaf
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Re: Repeated failure with flow hood [Re: Cue]
    #22478014 - 11/04/15 07:35 PM (8 years, 2 months ago)

this might sound dumb, but it happened in a thread before….are u sure it doesn't say .4"?  some of the stickers are hand written, some are printed out.
when i look at HEPA's, it always seemed like the 12"  filters had lower SP's.


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Re: Repeated failure with flow hood [Re: blindingleaf]
    #22478043 - 11/04/15 07:40 PM (8 years, 2 months ago)



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Invisiblemicelio
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Re: Repeated failure with flow hood [Re: Cue]
    #22478053 - 11/04/15 07:42 PM (8 years, 2 months ago)

Quote:

Cue said:
12". I'm just trying to get all the bases covered before I order another blower. I was looking at the Dayton 1tdu2, but it seems like I'm going to be slicing down a lot of that intake to get it closer to 400cfm at 0.9".

Thoughts? Is this the likely root of the problem?



From what I understand is: The 12"deep Hepa filter is for filtering rooms. It lets twice the air through than the 6" filter.
That could be why you have high velocity without much back pressure (Static pressure)

This high-power, multi-purpose blower is the perfect choice for pushing air through our 24x18, 24x24 and 24x36 inch HEPA filters. Dual-voltage power supply operates at either 115 or 230V. Delivers 1,040 CFM at .8" static pressure. Draws 4.8/2.5 amps @115V or 7.3/3.7 amps @ 230V. - See more at: http://www.fungi.com/product-detail/product/universal-blower-1040-cfm-8-sp.html#sthash.wHAvROX1.dpuf

These filters are 6" deep.. I'm not sure if you can get laminar flow with the 12" deep filter with this blower..

Maybe someone with some knowledge will chime in.. This is a little over my head for me to offer advice..


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OfflineCue
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Re: Repeated failure with flow hood [Re: Cue]
    #22478054 - 11/04/15 07:42 PM (8 years, 2 months ago)

That's not directly off of my personal filter, but realistically I don't want to undo the caulking to see the paper. I know it's an astrocel I, seems dubious that the one I have would be 0.4 when everything online has it as 0.9


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Re: Repeated failure with flow hood [Re: Cue]
    #22478063 - 11/04/15 07:45 PM (8 years, 2 months ago)

Interesting point micelio. Curious is someone can chime in on that


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Invisibleazur
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Re: Repeated failure with flow hood [Re: Cue]
    #22478080 - 11/04/15 07:50 PM (8 years, 2 months ago)

Well, this will be a first for me, but

Quote:

RogerRabbit said:
You can use whatever you want.  The engineers who design and manufacture them make the 12" thick filters for clean room use, and the 5" to 7" for flow hood use. 
RR





http://www.shroomery.org/forums/showflat.php/Number/19780786


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Invisibleblindingleaf
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Re: Repeated failure with flow hood [Re: Cue]
    #22478088 - 11/04/15 07:51 PM (8 years, 2 months ago)

yea, thats looks like a .9"
i just wanted to make sure…a thread maybe a month ago the dude read a hand written label as .9" when it was .4"

Im using the one micelio linked for my 2x3, and it blows at 173 fpm.
i know FP suggests that for their 2x2 as well, so u can go for it if u want.

this blower is a little weaker, and might be good too for a 2x2.


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Re: Repeated failure with flow hood [Re: blindingleaf]
    #22478103 - 11/04/15 07:55 PM (8 years, 2 months ago)

The TDT5 is what I am running now, albeit with a 24x24x12 filter. Il have to look for a 6" I guess


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