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OfflineHighHarles
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Searching for a Blower
    #26486917 - 02/15/20 11:22 AM (3 years, 11 months ago)

I'm looking for a blower as I'm building a flow hood. The filter I ordered is 36 × 48 × 5.875
Correct me if I'm wrong but the static pressure would be 1200 cfm? With the pre filter (that hasnt been chosen) would I need much more than this. I'm having a hard time finding one that goes a little above this.
https://www.patrickssupply.com/Fasco-A1200-64-to-1200-CFM-Centrifugal-Blower-Asse-p/a1200.htm?gclid=Cj0KCQiAyp7yBRCwARIsABfQsnT068MYFfzDXUD0RCiy0Xzp-z6HZeH6s9c7YX49PUEA5WUnZUQDWBEaAqwKEALw_wcB&scid=scplpa1200&sc_intid=a1200
I found something right at 1200 cfm though?


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InvisiblebodhisattaMDiscordReddit
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Re: Searching for a Blower [Re: HighHarles]
    #26486936 - 02/15/20 11:31 AM (3 years, 11 months ago)

3x4 = 12 * 100fpm = 1200cfm

But that's the flow required at the resistance of the filter. The blower needs to produce at least 1200cfm against the resistance of the filter. You need the resistance.


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OfflineHighHarles
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Re: Searching for a Blower [Re: bodhisatta]
    #26486983 - 02/15/20 11:58 AM (3 years, 11 months ago)

Quote:

bodhisatta said:
3x4 = 12 * 100fpm = 1200cfm

But that's the flow required at the resistance of the filter. The blower needs to produce at least 1200cfm against the resistance of the filter. You need the resistance.



Is there a max or a range if 1200 would be the min? What would be deemed sufficient? 2000 cfm?
Goodman 2000 CFM  Blower priced at
$400
https://www.totalhomesupply.com/2000-cfm-modular-blower-air-handler/p/GOODMAN-MBR2000AA1

$650
https://www.thefurnaceoutlet.com/Multi-Position-Modular-Blower-with-a-Variable-Speed-Fan-2000-CFM-Model-DC-MBVC2000AA-1_p_6814.html?gclid=Cj0KCQiAyp7yBRCwARIsABfQsnTkChKg_p3f-xGQwxyjid1laAlUPH9mtdAV9-oy642xQ5o4l_6p_M4aAotkEALw_wcB


Do axial blowers work? Pricing is pretty cheap.


Edited by HighHarles (02/15/20 12:42 PM)


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InvisiblebodhisattaMDiscordReddit
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Re: Searching for a Blower [Re: HighHarles]
    #26487035 - 02/15/20 12:40 PM (3 years, 11 months ago)

You need the resistance of the filter. And the cfm the blower pushes at that resistance needs to be >1200

If your filter has a resistance of 1.5"w.g. and your 1200cfm blower only pushes 500cfm at 1.5"w.g. it won't work


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OfflineHighHarles
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Re: Searching for a Blower [Re: bodhisatta]
    #26487046 - 02/15/20 12:47 PM (3 years, 11 months ago)

Do I calculate this (formula?) or am I missing it in the products details?
https://www.zoro.com/koch-filter-hepa9997-prtcl-36x48x5875-h31g1x1/i/G1504699/
Thanks bod!!

I've been searching (even on koch's site) cant find the initial resistance. Found a thread on mycotopia of someone looking as well XD :/


Edited by HighHarles (02/15/20 01:23 PM)


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Offlineantmanmax
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Re: Searching for a Blower [Re: HighHarles]
    #26487050 - 02/15/20 12:55 PM (3 years, 11 months ago)

I thought hookup threads weren't allowed on this board


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OfflineHighHarles
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Re: Searching for a Blower [Re: antmanmax]
    #26487059 - 02/15/20 01:02 PM (3 years, 11 months ago)

Quote:

antmanmax said:
I thought hookup threads weren't allowed on this board



If there's a place more suitable for this, please by all means, move it.


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Offlineantmanmax
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Re: Searching for a Blower [Re: HighHarles] * 1
    #26487128 - 02/15/20 01:52 PM (3 years, 11 months ago)

Quote:

HighHarles said:
Quote:

antmanmax said:
I thought hookup threads weren't allowed on this board



If there's a place more suitable for this, please by all means, move it.




I was making a shitty joke about you searching for a blower.


--------------------


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OfflineHighHarles
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Re: Searching for a Blower [Re: antmanmax]
    #26487154 - 02/15/20 02:13 PM (3 years, 11 months ago)

Koch's website has several listed. None with this manufacturer #
I'm not too sure why. I sent an email in Hope's of a response.
The majority of the filters similar to the one purchased is 1.5 w.g.
Others were listed at 1.2, and 1.0
If anyones used this filter and has already sorted this out drop some wisdom for your boi :smile:


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OfflineOregonic
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Re: Searching for a Blower [Re: HighHarles]
    #26487177 - 02/15/20 02:31 PM (3 years, 11 months ago)

Quote:

HighHarles said:
Quote:

bodhisatta said:
3x4 = 12 * 100fpm = 1200cfm

But that's the flow required at the resistance of the filter. The blower needs to produce at least 1200cfm against the resistance of the filter. You need the resistance.



Is there a max or a range if 1200 would be the min? What would be deemed sufficient? 2000 cfm?
Goodman 2000 CFM  Blower priced at
$400
https://www.totalhomesupply.com/2000-cfm-modular-blower-air-handler/p/GOODMAN-MBR2000AA1

$650
https://www.thefurnaceoutlet.com/Multi-Position-Modular-Blower-with-a-Variable-Speed-Fan-2000-CFM-Model-DC-MBVC2000AA-1_p_6814.html?gclid=Cj0KCQiAyp7yBRCwARIsABfQsnTkChKg_p3f-xGQwxyjid1laAlUPH9mtdAV9-oy642xQ5o4l_6p_M4aAotkEALw_wcB


Do axial blowers work? Pricing is pretty cheap.




Hey dude, I'm in the HVAC biz (though not exactly a FH professional) so I thought I could be of some help here and get you data sheets for the two units you linked. The first one is here for the Goodman MBR. As you can see the data only goes up to .6 because Goodman engineers don't expect their blowers to be used in these sorts of higher resistance applications.

And here is the link to the data sheet for second unit Idk what rebranded BS that is on the site you linked but the MBVC is a goodman product so this data sheet would still apply. With a variable speed blower the curve is much less steep as they can overcome resistance better than a PSC/multi-speed/direct drive, and does show data up to .9.

While I can't find the rating of your specific filter I've always thought 1.0 is pretty standard with that thickness and design? Take that with a grain of salt. The first blower has a curve that seems fairly linear around -100cfm per .1" wc from .1-.6, and while on many blowers that curve gets a little steeper up into higher resistances, it could be pretty close to 1200cfm @ 1.0", however if it were me I'd probably want to be sure. Especially if you plan on adding a pre-filter, the extra resistance can make a pretty big difference.

Also if you're in the US, be warned those blowers are 240v. That might be obvious to you but just figured I'd throw that out there.

Lastly I've always heard axial fans weren't great for FH because they create a ton of extra turbulence/spiraling air, and not ideal for laminar flow. Pretty sure most of them have static pressure curves that drop off a fuckin cliff in the higher resistances, finding one with specs to meet your application would probably end up being pretty expensive anyway. I don't have a ton of experience with axial fans except for growrooms where that turbulence shit doesn't matter lol.

Edit: Here is a fairly priced Dayton blower that would have you covered up to 1.5" if your filter ends up calling for it. And this blower is actually designed for higher resistance applications. That assembly is unassembled but if you are building a FH I'm sure you could handle putting it together.


Edited by Oregonic (02/15/20 02:51 PM)


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OfflineHighHarles
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Registered: 07/07/18
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Re: Searching for a Blower [Re: Oregonic]
    #26487195 - 02/15/20 02:42 PM (3 years, 11 months ago)

Quote:

Oregonic said:
Quote:

HighHarles said:
Quote:

bodhisatta said:
3x4 = 12 * 100fpm = 1200cfm

But that's the flow required at the resistance of the filter. The blower needs to produce at least 1200cfm against the resistance of the filter. You need the resistance.



Is there a max or a range if 1200 would be the min? What would be deemed sufficient? 2000 cfm?
Goodman 2000 CFM  Blower priced at
$400
https://www.totalhomesupply.com/2000-cfm-modular-blower-air-handler/p/GOODMAN-MBR2000AA1

$650
https://www.thefurnaceoutlet.com/Multi-Position-Modular-Blower-with-a-Variable-Speed-Fan-2000-CFM-Model-DC-MBVC2000AA-1_p_6814.html?gclid=Cj0KCQiAyp7yBRCwARIsABfQsnTkChKg_p3f-xGQwxyjid1laAlUPH9mtdAV9-oy642xQ5o4l_6p_M4aAotkEALw_wcB


Do axial blowers work? Pricing is pretty cheap.




Hey dude, I'm in the HVAC biz (though not exactly a FH professional) so I thought I could be of some help here and get you data sheets for the two units you linked. The first one is here for the Goodman MBR. As you can see the data only goes up to .6 because Goodman engineers don't expect their blowers to be used in these sorts of higher resistance applications.

And here is the link to the data sheet for second unit Idk what rebranded BS that is on the site you linked but the MBVC is a goodman product so this data sheet would still apply. With a variable speed blower the curve is much less steep as they can overcome resistance better than a PSC/multi-speed/direct drive, and does show data up to .9.

While I can't find the rating of your specific filter I've always thought 1.0 is pretty standard with that thickness and design? Take that with a grain of salt. The first blower has a curve that seems fairly linear around -100cfm per .1" wc from .1-.6, and while on many blowers that curve gets a little steeper up into higher resistances, it could be pretty close to 1200cfm @ 1.0", however if it were me I'd probably want to be sure. Especially if you plan on adding a pre-filter, the extra resistance can make a pretty big difference.

Also if you're in the US, be warned those blowers are 240v. That might be obvious to you but just figured I'd throw that out there.

Lastly I've always heard axial fans weren't great for FH because they create a ton of extra turbulence/spiraling air, and not ideal for laminar flow. Pretty sure most of them have static pressure curves that drop off a fuckin cliff in the higher resistances, finding one with specs to meet your application would probably end up being pretty expensive anyway. I don't have a ton of experience with axial fans except for growrooms where that turbulence shit doesn't matter lol.




Really appreciate the knowledge shared I'll pick over it through the next few hours before I can dissect after work. Thanks a ton


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OfflineOregonic
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Re: Searching for a Blower [Re: HighHarles]
    #26487211 - 02/15/20 02:53 PM (3 years, 11 months ago)

No prob dude, also make sure you check my edit on that other blower. Good luck with the project, I need to get around to building a badass FH like this instead of my dinky little piece of shit :rolleyes:


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OfflineHighHarles
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Re: Searching for a Blower [Re: Oregonic]
    #26488313 - 02/16/20 12:14 PM (3 years, 11 months ago)

They are constructed of approximately 50% more filter media than standard capacity filters and operate at velocities of up to 2000 CFM with only a slight increase in pressure drop.

I stumbled on this
Keep it between 1200-2000?
I'm still waiting for the weekdays to come rolling through for a potential response from the manufacturer

Oofta obvious idea...
Get a 2000 cfm blower with a speed variable switch or whatever ya call it and dial it back

Good or bad idea?

Can you add more than one lower rated blower and still increase cfm? Say two 1,000 cfm blowers?


Edited by HighHarles (02/16/20 01:23 PM)


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OfflineSFS96
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Re: Searching for a Blower [Re: HighHarles]
    #26489095 - 02/16/20 09:22 PM (3 years, 11 months ago)

You might want to look at the Dayton 1XJY2 it puts out 1217cfm at a S.P. of 1.25 but you should get your filter first and see what the specs are before deciding on a blower.


--------------------
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Consuming consumes a man That was never a purpose of life To only crave for material joys Is believing the lie - Mellow Mood


Edited by SFS96 (02/16/20 09:29 PM)


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