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HEPA Filters #5264780 11/12/19 07:20 AM
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Passport1 Offline OP
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I've been running a couple of HEPA filters in my house for a several years, one on each floor. They seem to do an efficient job judging by the dirt that accumulates on the prefilters. Filters are expensive for these and they use plenty of electricity.

Would I be just as well off buying high end furnace filters and running the fans?

Anybody else use HEPAs?

[Linked Image]


1992 940 Volvo turbo 320K
2006 Saab 9-3 86k
2007 Suzuki Burgman
2012 Suzuki Kizashi
Re: HEPA Filters [Re: Passport1] #5264788 11/12/19 07:30 AM
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Donald Offline
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I would get one of those large filter housings installed into the return of your furnace. They have a huge filter surface area.


2015 Subaru Forester 2.5 engine/CVT
2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)
Re: HEPA Filters [Re: Passport1] #5264789 11/12/19 07:33 AM
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JohnnyJohnson Online Content
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How large of an area is that HEPA suppose to service? Name brand?


2004 Corolla 137366
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Re: HEPA Filters [Re: Passport1] #5264811 11/12/19 08:05 AM
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motts Offline
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They shouldn't use that much electricity. It is just a fan going through a filter.

Re: HEPA Filters [Re: Passport1] #5264814 11/12/19 08:07 AM
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UncleDave Online Content
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I wouldn't use my house furnace and ducting as an air cleaner, but a high merv filter that doesnt cause too big a pressure drop is always a good idea.

I stopped buying air filters that use proprietary media and instead use high merv furnace filters on a box fans.

Doenst look as pretty for sure but a Dylos particle counter didnt see the difference between this and my blueair 650 E

I'm filtering a construction area here - but you get the idea......


[Linked Image]


Uncle Dave
Cat 3126/2 MB3500/Titan/RX400H/17 Ridgeline
700HP V10/ 725HP BBC/ Raptor 700/ KFX450/ YZ250/Onan 8K/ Cat3011C
Re: HEPA Filters [Re: UncleDave] #5264860 11/12/19 09:29 AM
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cb_13 Offline
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I used the exact same box fan and furnace filter set up a few years back when doing some remodeling. It sure did collect a lot of sheet rock dust.

Re: HEPA Filters [Re: Passport1] #5264864 11/12/19 09:34 AM
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motor_oil_madman Offline
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What's the purpose of this?


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: HEPA Filters [Re: Passport1] #5264867 11/12/19 09:39 AM
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motor_oil_madman Offline
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2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: HEPA Filters [Re: Passport1] #5264885 11/12/19 10:01 AM
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gathermewool Offline
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I have the same (or similar) filter as the OP. We ran it for years without having to replace the filter. I vacuumed the pre-filter media and media with a handheld vac (dyson) with a washable filter. This worked for several years.

For S&G's, I just replaced the larger filter with a new aftermarket one and can't tell the difference in sound or air-flow.

We only run a filter in our bedroom, because we have pretty bad seasonal allergies and wanted to have one "clean" space. We open the windows throughout the rest of the house during cool/warm days, but leave our bedroom shut-up. Seems to work. I start to cough when I come out of the room for the first hour or so, until my antihistamine kicks in or I get used to the allergens.

//

That box-fan-and-home-filter idea looks really cool. How much airflow are you really getting out of it, though? I would swear that I tried that before and it was putting out almost nothing for airflow, so I gave up on the project. In contrast, my bedroom filter puts out enough air that, while it's in the corner, we can feel the air that bounces off the high ceiling in our bed in the center of the room.


14 Forester XT Touring FA20DIT (Cobb Stage 1)
Castrol Magnatec 5W-30 D1G2 + FU filter (72,320mi, 8/24/19)
15 Legacy Premium FB25
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Re: HEPA Filters [Re: Passport1] #5264888 11/12/19 10:06 AM
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UncleDave Online Content
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Not all house dust is created equal.

I live 1/2 mile from one of the busiest freeway interchanges on the West coast.

This combo rubber, brake, tailpipe dust is extremely nasty - when concentrated in my pool skimmer it makes a rainbow so I know it's loaded with oil as well.

I take all reasonable steps to reduce this indoor pollution.

UD


Uncle Dave
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Re: HEPA Filters [Re: gathermewool] #5264897 11/12/19 10:22 AM
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UncleDave Online Content
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Originally Posted by gathermewool

That box-fan-and-home-filter idea looks really cool. How much airflow are you really getting out of it, though? I would swear that I tried that before and it was putting out almost nothing for airflow, so I gave up on the project. In contrast, my bedroom filter puts out enough air that, while it's in the corner, we can feel the air that bounces off the high ceiling in our bed in the center of the room.


it's pretty good with w a Merv 12/13 or Home depot "FPR 10" it moves a decent amount of air for the first month In terms of clean air delivery rate with a new filter.

A lasko box fan can move 2500 CFM on high -

I'd guess this cuts down to half or so with a high Merv filter - which is still VERY high in terms of CADR but I haven't used a flow gauge on it.

When teh airflow slows down enough to be noticeable -I toss it. In a cleaner environment, I've had them go 6 months...

It works well enough for me that I won't buy dedicated air filters anymore because of filter availability, cost, and the difficulty to clean - my blueair 650 ( a highly rated brand) CANNOT be fully cleaned.

Heres 7 days in light construction with a different filter.

UD

IMG_9264.jpg

Uncle Dave
Cat 3126/2 MB3500/Titan/RX400H/17 Ridgeline
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Re: HEPA Filters [Re: UncleDave] #5264915 11/12/19 10:53 AM
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Mad_Hatter Offline
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Originally Posted by UncleDave
I wouldn't use my house furnace and ducting as an air cleaner, but a high merv filter that doesnt cause too big a pressure drop is always a good idea.

I stopped buying air filters that use proprietary media and instead use high merv furnace filters on a box fans.

Doenst look as pretty for sure but a Dylos particle counter didnt see the difference between this and my blueair 650 E

I'm filtering a construction area here - but you get the idea......


[Linked Image]

Ya know.. that's a good idea. 👍

Re: HEPA Filters [Re: Passport1] #5264919 11/12/19 10:55 AM
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UncleDave Online Content
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From a 3rd party

Aerospeed box fan:
No filter: 10.2 mph
1" MERV8 filter: 6.3 mph
4" MERV11 filter: 8.4 mph

Lasko Premium Weathershield box fan:
No filter: 11.9 mph
1" MERV8 filter: 9.2 mph
4" MERV11 filter: 10.6 mph


Uncle Dave
Cat 3126/2 MB3500/Titan/RX400H/17 Ridgeline
700HP V10/ 725HP BBC/ Raptor 700/ KFX450/ YZ250/Onan 8K/ Cat3011C
Re: HEPA Filters [Re: UncleDave] #5264931 11/12/19 11:07 AM
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Mad_Hatter Offline
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Originally Posted by UncleDave
From a 3rd party

Aerospeed box fan:
No filter: 10.2 mph
1" MERV8 filter: 6.3 mph
4" MERV11 filter: 8.4 mph

Lasko Premium Weathershield box fan:
No filter: 11.9 mph
1" MERV8 filter: 9.2 mph
4" MERV11 filter: 10.6 mph

I've got several box fans that I use in the summer and I hate pulling in the pollen laden air from the trees and what not. I'm gonna do this.. great idea. Tx...😉

(I do use multiple HEPA filters around the house but it always seemed counter productive to be pulling in unfiltered air during the spring and summer months)

Last edited by Mad_Hatter; 11/12/19 11:09 AM.
Re: HEPA Filters [Re: Passport1] #5264935 11/12/19 11:08 AM
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gathermewool Offline
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Uncle Dave,

Thanks for the reply, sir. Any issues with burning out the motors on the box fans, long-term? I'm sure they're probably designed not to die, even if flow is dead-headed (fan falls over), but how long have you been doing this and have you had any deleterious effects (e.g., more motor noise?)

//

I've got a VERY expensive 5-stage HEPA filter, as well that is completely washable (not sure how that works, but it's been doing a great job). The problem is that the motor is making a ton of noise, especially at low speeds. New, it was whisper quiet. Now, I can hear all the way across a second large room from where it's running.

The kicker: I was able to disassemble and actually remove the motor pretty easily, but replacements are not offered, according to the company!!!

I still run the filter, because it does do a great job (based on how quickly it becomes dirty), but I've got to imagine that the motor is causing additional electrical draw (it ran too hot to hold in my hand, with the motor out of the housing - I'm sure it's much cooler with the fan providing cooling, of course!); extra noise and heat = more power being used.

Oh, it does look pretty smirk2


14 Forester XT Touring FA20DIT (Cobb Stage 1)
Castrol Magnatec 5W-30 D1G2 + FU filter (72,320mi, 8/24/19)
15 Legacy Premium FB25
Magnatec 5W-20 + FU filter (47,300mi, 5/11/19)
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