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3-Pack 3M Filtrete Allergen Defense HVAC Furnace Filters (800 MPR) EXPIRED

$15.90
+ Free Store Pickup
+28 Deal Score
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Walmart has select 3-Pack 3M Filtrete Allergen Defense HVAC Furnace Filters (800 MPR) on sale for $15.88. Free store pickup where available, otherwise shipping is free on orders $35+. Thanks unlvrebels

Available Sizes:
  • 12x24x1"
  • 14x20x1"
  • 18x24x1"
  • 20x20x1"
  • 20x25x1"
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Edited June 26, 2018 at 11:09 AM by
Walmart.com has select 3-Pack 3M Filtrete Allergen Defense HVAC Furnace Filters (800 MPR) on sale for $15.88. Select free in-store pickup to save on shipping, otherwise shipping is free on orders $35 or more.

I ordered these few days ago and the packaging says Buy 2 Get 1 Free. Each filter shows the spec as MERV 9.

Available Sizes:
12x24x1"
14x20x1"
14x24x1"
16x20x1"
16x25x1"
18x24x1"
20x20x1"
20x25x1"


https://www.walmart.com/ip/Filtre...thena=true
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FYI guys, if your furnace isn't designed to take these high MERV filters, using them is a bad idea.

Why? Airflow restriction.

1. Reduced efficiency - restricting the airflow so much reduces the efficiency of your heating/cooling.
2. AC coil freezing - restricting airflow means your AC coil will be more likely to freeze over.
3. Filter bypass - as filters catch stuff, it gets harder and harder for air to pass through them. These already start with a pretty high airflow restriction. At a certain point the system will start sucking air from wherever it can - holes, cracks, etc.. and you'll be getting dust in your 'fresh' air anyway. This can be especially bad for your AC A-coil - because even with that fancy filter your coil can get clogged with dust (very hard to clean on most furnaces!).

Typically, a 1" filter box means your HVAC system was not designed for MERV ratings over 8 or so. Companies still churn these things out because consumers buy them, despite the fact that they can lead to a number of problems.
16 Helpful?
Former HVAC engineer. Please consider yourself warned. Your furnace need a filter to protect itself from getting caked up with typical household dust. It was only designed to take a basic filter (blue mesh).

Your HVAC unit was not intended to be a whole home air cleaner and CANNOT handle the pressure drop that these filters create.

Your blower will see a LARGE increase in static pressure, which is the force your fan is pushing against to move air down the ductwork. This will overwork the blower motor. It will also reduce the airflow across the coil thus causeing less heat transfer to happen in the refrigerant, thus meaning some liquid coolant will return back to the compressor. having liquid hit your compressor inlet will cause cavitation and destroy it.

Please dont buy these, and simply use a basic blue mesh filter. If you need home air purifying then get a purifier.
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#3
These are usually $8 each
Thanks OP!
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#4
Can anyone find this on Google Express? Should they not have the same stuff?

I see a 2pk but not this 3pk there.
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#5
Thanks. Grabbed a few. Should last me a year or two.
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#6
FYI guys, if your furnace isn't designed to take these high MERV filters, using them is a bad idea.

Why? Airflow restriction.

1. Reduced efficiency - restricting the airflow so much reduces the efficiency of your heating/cooling.
2. AC coil freezing - restricting airflow means your AC coil will be more likely to freeze over.
3. Filter bypass - as filters catch stuff, it gets harder and harder for air to pass through them. These already start with a pretty high airflow restriction. At a certain point the system will start sucking air from wherever it can - holes, cracks, etc.. and you'll be getting dust in your 'fresh' air anyway. This can be especially bad for your AC A-coil - because even with that fancy filter your coil can get clogged with dust (very hard to clean on most furnaces!).

Typically, a 1" filter box means your HVAC system was not designed for MERV ratings over 8 or so. Companies still churn these things out because consumers buy them, despite the fact that they can lead to a number of problems.
Reply Helpful Comment? 17 1
Last edited by Caleo June 26, 2018 at 11:38 AM.
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#7
MERV 9 isn't that high though, it's toward the middle of the chart. Right?
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#8
MERV 9 will SIGNIFICANTLY reduce the life of your furnace. Just a head up.
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#9
Quote from scsiguru
:
MERV 9 will SIGNIFICANTLY reduce the life of your furnace. Just a head up.
Merv 9 will SIGNIFICANTLY increase the life of your furnace. Just a heads up.
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Quote from eiloo
:
Can anyone find this on Google Express? Should they not have the same stuff?

I see a 2pk but not this 3pk there.
I saw it for the size 20x25x1 on Google Express about 2 weeks ago.
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#11
Quote from qtbrye
:
MERV 9 isn't that high though, it's toward the middle of the chart. Right?
Yes, 5-9 is the mid-range.
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#12
no 12x36.:(
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#13
Quote from Caleo
:
FYI guys, if your furnace isn't designed to take these high MERV filters, using them is a bad idea.

Why? Airflow restriction.

1. Reduced efficiency - restricting the airflow so much reduces the efficiency of your heating/cooling.
2. AC coil freezing - restricting airflow means your AC coil will be more likely to freeze over.
3. Filter bypass - as filters catch stuff, it gets harder and harder for air to pass through them. These already start with a pretty high airflow restriction. At a certain point the system will start sucking air from wherever it can - holes, cracks, etc.. and you'll be getting dust in your 'fresh' air anyway. This can be especially bad for your AC A-coil - because even with that fancy filter your coil can get clogged with dust (very hard to clean on most furnaces!).

Typically, a 1" filter box means your HVAC system was not designed for MERV ratings over 8 or so. Companies still churn these things out because consumers buy them, despite the fact that they can lead to a number of problems.
How can you tell? I have a ML195UH045XP36B and it mentions nothing about MERV in the manual:
http://www.hvac.com/media/manuals...0XP60C.pdf
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#14
Former HVAC engineer. Please consider yourself warned. Your furnace need a filter to protect itself from getting caked up with typical household dust. It was only designed to take a basic filter (blue mesh).

Your HVAC unit was not intended to be a whole home air cleaner and CANNOT handle the pressure drop that these filters create.

Your blower will see a LARGE increase in static pressure, which is the force your fan is pushing against to move air down the ductwork. This will overwork the blower motor. It will also reduce the airflow across the coil thus causeing less heat transfer to happen in the refrigerant, thus meaning some liquid coolant will return back to the compressor. having liquid hit your compressor inlet will cause cavitation and destroy it.

Please dont buy these, and simply use a basic blue mesh filter. If you need home air purifying then get a purifier.
Reply Helpful Comment? 9 1
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#15
Quote from r0nski2000
:
Merv 9 will SIGNIFICANTLY increase the life of your furnace. Just a heads up.
<Source needed>

Good luck. Unless you're suggesting stepping DOWN to merv 9, physics and all sources of information on the matter will disagree. Using high MERV filters on a furnace not designed for them is a bit like trying to breathe through a blanket. You might be able to do it for a while but good luck under stress.
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Last edited by Caleo June 26, 2018 at 01:27 PM.
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