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3-Pack 3M Filtrete Allergen Defense 800 MPR Air Filters (various sizes)

2 for $26.80
$47.64
after $5 Rebate
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Walmart has 3-Pack 3M Filtrete Allergen Defense 800 MPR Furnace Air Filters (various sizes) on sale below after Mail-in Rebate. Shipping is free on orders $35 or more. Thanks gettingpoorer

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Edited September 15, 2020 at 01:54 AM by
Great deal on air filters which are getting harder to find nowadays. Many sizes in stock at the time of this posting.

Link to Filtrete 800 MPR air filters (3 packs):
https://www.walmart.com/ip/Filtre...s/45649356

Link to rebate:
https://multimedia.3m.com/mws/med...ne-pdf.pdf

Rebate options:
$5.00 if you buy 2 x 3 packs (would need filler to qualify for free shipping) - $26.76 after rebate + filler + tax
$8.00 if you buy 3 x 3 packs (free shipping) - $39.64 after rebate + filler + tax
$12.00 if you buy 4 x 3 packs (free shipping) - $51.52 after rebate + filler + tax

Cost per filter would be ~$4.29-$4.46 (+ tax) depending on how many packs are purchased.

https://www.walmart.com/ip/Filtre...ected=true
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2 for $26.80
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This comment has been rated as unhelpful by Slickdeals users
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#16
Quote from bilko987
:
FYI, for those replacing filters to help clean the smokey air in our homes you should know these aren't rated for smoke. You'll need something with a higher merv rating.
Yep, merv 13 minimum. But at that point, you begin to lower your life on your heater blower, and energy bills go up the more you block air.

Best to just use a box fan with a filter attached for filtering out smoke, and run it on low, so that it don't burn out the motor.
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#17
Quote from bezemom
:
I have done that just hot glued the original end back on after cutting it to size
My size is 14x25 but they don't have that.
They have 14x30 so I was thinking of just cutting the edge off to fit.

Why even bother to put the cardboard back on the edge?
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Last edited by Pi.314 September 15, 2020 at 08:25 AM.
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#18
Quote from gettingpoorer
:
Rebate options:
$5.00 if you buy 2 x 3 packs (would need filler to qualify for free shipping) - $26.76 after rebate + filler + tax
$8.00 if you buy 3 x 3 packs (free shipping) - $39.64 after rebate + filler + tax
$12.00 if you buy 4 x 3 packs (free shipping) - $51.52 after rebate + filler + tax
No filler required if buying three or more.
I bought these a few weeks ago and they are MERV 9. Not MERV 10 as indicated on the packaging in the photo.
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#19
Quote from sorbitol
:
Yep, merv 13 minimum. But at that point, you begin to lower your life on your heater blower, and energy bills go up the more you block air.

Best to just use a box fan with a filter attached for filtering out smoke, and run it on low, so that it don't burn out the motor.
This. I got in a heated discussion on here with some moron who claimed to be an AC tech that said by using a high merv filter you actually used LESS power and it was easier on the blower motor. My god its scary the kind of untrained idiots doing AC service these days.
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#20
Always looking for 14x18 but can't find
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#21
Quote from iamlamont
:
Wish they had 20x20. Too bad. Anyway good post op. Slick if it works for you though.
All 20x20 is gone from all local stores due to making DIY air filter for smokes here on the west coast.
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#22
Quote from massive
:
It's all marketing according to my HVAC technician. He advised me NOT to buy filters with very high merv ratings. Just buy low priced regular filters with merv 4 to 6 and replace it frequently may be every 3 months or when it gets dirty even before 3 months.
So I useualy buy this https://www.amazon.com/dp/B07FNWCLPJ at regular price.
I would have to disagree with this. There is surely an impact based on what filtration level you use. Whether you, your body can notice any effect is subjective. Although, scientifically, a more obstructive filter would collect said smaller particles more effectively. As others have mentioned, you need to just be mindful of potential impact to your blower's "lifespan".
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#23
Quote from SlyG07
:
I would have to disagree with this. There is surely an impact based on what filtration level you use. Whether you, your body can notice any effect is subjective. Although, scientifically, a more obstructive filter would collect said smaller particles more effectively. As others have mentioned, you need to just be mindful of potential impact to your blower's "lifespan".
I bet negative pressure is sucking in unfiltered air post filter anyways
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#24
of course he told you that. the dirtier the air that goes through your system, the more dirt gets on the coils and reduces their surface area. this reduces HVAC efficiency making the system work harder and reducing it's lifespan. his advice will lead to premature system failure making him more money when you have to pay for a new HVAC system.
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#25
Go with cheaper, lower merv rated filters and get a legitimate air purifier. If you live in an area prone to fires and bad air, you should really have a purifier in each room. Why would you want to possibly lower the life of your expensive HVAC system and potentially decrease efficiency?
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#26
Quote from ranova
:
Go with cheaper, lower merv rated filters and get a legitimate air purifier. If you live in an area prone to fires and bad air, you should really have a purifier in each room. Why would you want to possibly lower the life of your expensive HVAC system and potentially decrease efficiency?
Alternatively, in addition to the air purifier, especially in the west coast right now.. get the highest MERV or even HEPA rated 20x20 and put it behind a box fan. The smoke is intense right now. Don't bother with the high merv in the HVAC unless its a system designed for it.
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#27
I see 3-pack available for 20X25. Is the rebate for # of individual filters or the # of packs of filters?

NVM - I see that a multi-pack is considered as a single unit.
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Last edited by StrangeiLLusion September 15, 2020 at 09:59 AM.
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#28
Quote from SlyG07
:
I would have to disagree with this. There is surely an impact based on what filtration level you use. Whether you, your body can notice any effect is subjective. Although, scientifically, a more obstructive filter would collect said smaller particles more effectively. As others have mentioned, you need to just be mindful of potential impact to your blower's "lifespan".
You may have a point in a perfectly tight house with no outside air leakage or drafts from window and door seals or wall outlet boxes and ceiling exhaust fans. But in the real world this isnt the case. All the air in your home does not go through the blower filter and even less air goes through a high merv filter especially in an older house. IMO its simply a waste of money to buy high merv filters for the consumer and more a marketing gimmick .
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#29
Quote from hy_tek
:
You may have a point in a perfectly tight house with no outside air leakage or drafts from window and door seals or wall outlet boxes and ceiling exhaust fans. But in the real world this isnt the case. All the air in your home does not go through the blower filter and even less air goes through a high merv filter especially in an older house. IMO its simply a waste of money to buy high merv filters for the consumer and more a marketing gimmick .

haha i feel the same way, it is like paying $30 to add a filter to one of your 40 windows in your home but nothing to the other ones
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#30
For those who live in the western regions (OR, WA and CA) where fires are occurring, a high MERV rating (13) or FPR (10) will help you with smoke.

TL;DR

* 20x20" box fan (Lasko) at Home Depot for $18.87
* 20x20x1 (or 4" if you can find it) MERV 13 or FPR 10
* Replace by 140 day mark
* Filter on the input side (so it gets stuck)
* Duct or other tape to seal (and make sure that it doesn't fall off when your power gets cut)
* Carbon filter if you can will help with gasses and smells
* Set to medium speed so you don't overheat the motor

Costco has some nice Filtrete 2200 filters which are 4 for about $60 (delivered in 5-7 days)

Now for those who like numbers ... https://smartairfilters.com/data/en/

The gist is that these guys in Beijing (where air quality is pretty bad) run comprehensive tests using a smaller fan, but a filter stuck to it. They cover how long you have to run it, and of course using a PM 10, 2.5 and 0.5 meter to measure.

AQI is one measurement that we see on our iPhones or gets reported, but the PM (particle matter size) is what is going to get you, the vulnerable and kids. A decent meter can cost you $39. In my area, I was seeing an AQI of 172 outside at night (which is when it's at its worse) but with a PM10 of 656. The enclosed garage PM 10 was 383 and the in the house with a Dyson running dropped it to PM 120 (still bad).

This morning, the numbers improved for PM10 to 42 inside because the outside air quality improved.

According to the news, the air quality in the western region is so bad that it's equivalent to smoking 400 cigarettes.

A day.
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