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Mushrooms, Mycology and Psychedelics > Mushroom Cultivation
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flowhood blower size help
    #11638005 -

I just bought a 36x24 HEPA filter off e-bay that was originally purchased from Fungi Perfecti. The sticker on the unit says it is rated "896 cfm @ 1.0 MAX".

Required air speed per Stamets: 100 ft/min

3ft x 2ft = 6ft^2
100ft/min x 6ft^2 = 600ft^3/min (or 600cfm)

So will a 600cfm @ 1.0 - 1.2 (for prefilter) blower be enough for this? Or should I try to get closer to the "MAX" rate of 896?

I'm looking at these 2 blowers on ebay:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=200396608621&ssPageName=STRK:MEWAX:IT
Blower, Assembled, Double Inlet Forward Curve, Direct Drive, With Motor, 4 Speed, Wheel Dia 11 In, CFM Range 1857 to 622 @ 0.800-In SP to 1.25-In SP, Max Inlet Temp 104 Deg F, Voltage 115, 60 Hz, Single Phase, Motor HP 1/2, Housing Height 17 5/16 In, Housing Width 11 1/2 In, Housing Depth 16 9/16 In, Discharge Height 11 3/8 In, Discharge Width 10 1/2 In, Housing Material Steel, Housing Finish Gray Enamel


http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=200399208000&ssPageName=STRK:MEWAX:IT
Blower Assembled Double Inlet Forward Curve Direct Drive With Motor 1 Speed Wheel Dia 9 7/16 In CFM Range 1457 to 715 @ 0.300-In SP to 0.900-In SP Max Inlet Temp 104 Deg F Voltage 115 60 Hz Single Phase Motor HP 1/4 Housing Height 15 9/32 In Housing Width 12 5/16 In Housing Depth 15 In Discharge Height 10 1/4 In Discharge Width 11 13/16 In Housing Material Steel Housing Finish Gray Enamel




What do you guys think?

Edited by MessiahofSavants (12/12/09 05:51 PM)

Extras: Filter Print Post Top
Re: flowhood blower size help [Re: Messiah of Savants]
    #11638092 -

The 896 cfm @ 1" blower you bought will work great with your six square feet filter.  Get a furnace filter to use as a prefilter.
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

Extras: Filter Print Post Top
Re: flowhood blower size help [Re: RogerRabbit]
    #11638152 -

I haven't bought a blower yet. That's what I was trying to get advice on.

The HEPA filter itselt is rated at 896 @ 1.0 SP MAX.


The first blower listed is $197 and is rated:
CFM Range 1857 to 622 @ 0.800-In SP to 1.25-In SP

The second blower listed is $140 and is rated:
CFM Range 1457 to 715 @ 0.300-In SP to 0.900-In SP


I'm just trying to save $60 if I can.

Edited by MessiahofSavants (12/12/09 05:41 PM)

Extras: Filter Print Post Top
Re: flowhood blower size help [Re: Messiah of Savants]
    #11638180 -

suicide said:
I just bought a 36x24 blower off e-bay


Quote:
suicide said:I haven't bought a blower yet. That's what I was trying to get advice on.


That's what confused me.  You meant to say filter. 

Either motor should work.  If it's too strong, you can block off part of the intake, but those should work.  I prefer a slightly stronger motor, which can either be throttled by blocking the intake, or using a motor speed controller.  I turn the motor speed up on my flowhood as I let it run for two hours before starting sterile work, and then slow it down for the actual transfers.
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

Extras: Filter Print Post Top
Re: flowhood blower size help [Re: RogerRabbit]
    #11638232 -

Sorry for the mistype.

I thought both would work. Which would you go for? The $140 blower is rated 715cfm @ 0.9 SP, which will be close to my 600 @ 1.0-1.2 spec. I've researched a lot of blowers that drop off big time after the max pressure ratings and what that blower will do at 1.0 SP or higher isn't listed. I just want to make sure I have enough to get complete laminar flow through it was a prefilter.

I'm leaning towards just invested in the bigger blower for more flexibility.


PS. What is this "MAX" rating? The limit the filter will do without creating turbulence or higher chance of particles passing through? Any idea?


Thanks for the help!

Extras: Filter Print Post Top
Re: flowhood blower size help [Re: Messiah of Savants]
    #11638751 -

Can you use an inline fan? Or does it have to be a blower/squirrel fan ?

Extras: Filter Print Post Top
Re: flowhood blower size help [Re: Grzyby]
    #11639105 -

Does blocking the air intake reduce the life of the motor?

Extras: Filter Print Post Top
Re: flowhood blower size help [Re: Mikeallojee]
    #11639780 -

Mikeallojee said:
Does blocking the air intake reduce the life of the motor?


No, it extends it if anything.  Rather than causing more load on the blower motor, there is less.  Anyone with a clamp on ammeter can see this.  Check the current on the motor, and then put a piece of cardboard over the intake. The current draw of the motor will actually decrease.

To the original poster, I'd go with the larger motor.  You won't get 100% efficiency from any motor, plus you have to take into account loss from friction and the 90 degree turn the air makes as it pressurizes the plenum and passes out the filter.
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

Extras: Filter Print Post Top
Re: flowhood blower size help [Re: RogerRabbit]
    #11641082 -

Quote:
Can you use an inline fan? Or does it have to be a blower/squirrel fan ?


It could be an inline blower but I've never been able to find any good sources that show all the specs. Usually they just say something like "496cfm blower" and that's about it. They don't show at what static pressure that is at.  I want to make sure that what I get will work with my application.

Extras: Filter Print Post Top
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