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mushpunx
Fungus Punk



Registered: 04/20/14
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Last seen: 10 days, 17 hours
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Figuring out the resistance for Filtrete pre filter?
#26677094 - 05/17/20 03:15 PM (3 years, 8 months ago) |
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So I have a Filtrete 3m 10 x 20 x 1 filter, had some specs on the side :

Have a 12 x 24" hood (same blower/filter combo as FP Series 1), blower is 549CFM @ free air 360 @ .8sp, 240 @ 1.0sp ... At 1.2sp there is a significant drop, down below 120CFM
My filter is .8sp so as you can see I have to be careful what I choose as a prefilter, adding more than .2sp drops me down too low.
I have always been told these are typically .2sp but I never checked it out
Edited by mushpunx (05/17/20 03:17 PM)
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mushpunx
Fungus Punk



Registered: 04/20/14
Posts: 13,394
Last seen: 10 days, 17 hours
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Re: Figuring out the resistance for Filtrete pre filter? *DELETED* [Re: mushpunx]
#26678131 - 05/18/20 03:43 AM (3 years, 8 months ago) |
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Post deleted by mushpunx
Reason for deletion: Redundant
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bodhisatta 
Smurf real estate agent


Registered: 04/30/13
Posts: 61,889
Loc: Milky way
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Re: Figuring out the resistance for Filtrete pre filter? [Re: mushpunx]
#26678184 - 05/18/20 04:50 AM (3 years, 8 months ago) |
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Its a lot easier to just test it with a lighter. Also those 3m filtrete filters are well known in the hvac community as having more resistance than stated. Most professionals say not to use em they're bad for your hvac system. I would just test out different prefilters using the handy dandy bic lighter test
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mushpunx
Fungus Punk



Registered: 04/20/14
Posts: 13,394
Last seen: 10 days, 17 hours
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Re: Figuring out the resistance for Filtrete pre filter? [Re: bodhisatta]
#26678329 - 05/18/20 07:05 AM (3 years, 8 months ago) |
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Quote:
bodhisatta said: Its a lot easier to just test it with a lighter. Also those 3m filtrete filters are well known in the hvac community as having more resistance than stated. Most professionals say not to use em they're bad for your hvac system. I would just test out different prefilters using the handy dandy bic lighter test
Well with this filter on it definitely blows a lighter flame 45° at 6" and further. So you think it's fine then? I'm just curious because the difference between the flow without the prefilter on feels quite substantial (which makes sense because my blower pushes 360CFM @ 0.8) - if this prefilter adds more than 0.2sp it will definitely be dropping my flow well below 200CFM).
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senseit
Listening


Registered: 01/16/16
Posts: 156
Last seen: 5 months, 1 day
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Re: Figuring out the resistance for Filtrete pre filter? [Re: mushpunx]
#27220052 - 02/22/21 10:34 AM (2 years, 10 months ago) |
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Quote:
mushpunx said: Well with this filter on it definitely blows a lighter flame 45° at 6" and further. So you think it's fine then? I'm just curious because the difference between the flow without the prefilter on feels quite substantial (which makes sense because my blower pushes 360CFM @ 0.8) - if this prefilter adds more than 0.2sp it will definitely be dropping my flow well below 200CFM).
Mush, How's the prefilter working? I'm planning to build basically this exact flowhood and am wondering if you ended up keeping it on there or using something else
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