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Which of these 3M furnace filters is better and why?
Posted by: space-time
Date: January 06, 2018 12:03PM
I bought 10 of each a while ago, and I use both, but I did not keep track to see if there is a difference. Our son has some allergies and we do use an air purifier in his room, but keeping air cleaner in the rest of the house would also help.

I wonder if one of these is better in the spring/summer/fall and the other in the winter when there is less pollen in the air. or maybe I am overthinking this and both are just fine?

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Re: Which of these 3M furnace filters is better and why?
Posted by: Todd's keyboard
Date: January 06, 2018 12:28PM
Is there any way to narrow the choice down from three million?
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Re: Which of these 3M furnace filters is better and why?
Posted by: NewtonMP2100
Date: January 06, 2018 12:40PM
.....3Ms is..... --> m......m.....m.......



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I reject your reality and substitute my own!
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Re: Which of these 3M furnace filters is better and why?
Posted by: billb
Date: January 06, 2018 12:45PM
The one with more surface area.



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Re: Which of these 3M furnace filters is better and why?
Posted by: jdc
Date: January 06, 2018 12:55PM
You need to change them more often when in use for them to be effective, no matter the brand or cost.

They all say "90 days" but when your heat/AC is running a ton, 1 month is more realistic.



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Edited 999 time(s). Last edit at 12:08PM by jdc.
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Re: Which of these 3M furnace filters is better and why?
Posted by: Carm
Date: January 06, 2018 01:03PM
Quote
jdc
You need to change them more often when in use for them to be effective, no matter the brand or cost.

They all say "90 days" but when your heat/AC is running a ton, 1 month is more realistic.
This. We have two dogs and two kids. We change the filters monthly or twice monthly in the summer.
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Re: Which of these 3M furnace filters is better and why?
Posted by: C(-)ris
Date: January 06, 2018 01:04PM
I was changing mine every 6 months and they were horrible looking. I’ve been doing every 3 months and they still look pretty bad when coming out. Might change to monthly. I see Sam’s Club has large packs for a nice discount.



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Re: Which of these 3M furnace filters is better and why?
Posted by: Carm
Date: January 06, 2018 01:06PM
Buying in bulk saves a few bucks.
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Re: Which of these 3M furnace filters is better and why?
Posted by: space-time
Date: January 06, 2018 02:13PM
Quote
billb
The one with more surface area.

that would be the one in the right then.
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Re: Which of these 3M furnace filters is better and why?
Posted by: space-time
Date: January 06, 2018 02:18PM
Quote
Carm
Buying in bulk saves a few bucks.

yes, Home Depot had a deal, I think I paid $100-150? for 20 filters, where each is about $15-17 IIRC.
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Re: Which of these 3M furnace filters is better and why?
Posted by: Pam
Date: January 06, 2018 03:59PM
Target sometimes has deals on them as well. The higher the number the more filtration. I'd use the highest you can afford year around. You may also want to get an air purifier in the main living area of the house too.
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Re: Which of these 3M furnace filters is better and why?
Posted by: numbered
Date: January 06, 2018 04:10PM
The industry uses a standard called MERV to show the size of filtered particles. Higher MERV catches smaller particles and is more efficient (and is more expensive.) 3M has several filter versions, but they do not always use the MERV metric. (Your pict shows the "Home Depot Rating System FPR".)



Iallergy compares the 3M filter versions. Your purple version is a MERV 11 filter and rated "Better."

I used 3M for a long time, but found I could buy equivalent MERV filters for a fraction of cost of 3M. Search for MERV 11 (or more). You will have to input your filter size to get a quote.
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Re: Which of these 3M furnace filters is better and why?
Posted by: graylocks
Date: January 06, 2018 04:15PM
i buy a box of 6 Nordic Pure Merv 12 filters for about $40 from amazon.



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Edited 2 time(s). Last edit at 01/06/2018 04:16PM by graylocks.
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Re: Which of these 3M furnace filters is better and why?
Posted by: space-time
Date: January 06, 2018 05:02PM
thanks folks, in particular the last 2 posts, great info.

One question: Your purple version is a MERV 11 filter and rated "Better."


i am color blind. Both look "purple" to me. I asked the kids, none of them is color blind. They said the one on the right is dark purple, but both filters are purple. At least on my monitor.

Thanks for the link and nice explanation.
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Re: Which of these 3M furnace filters is better and why?
Posted by: DP
Date: January 06, 2018 05:47PM
There is the thing about these type of filters. It cost me a few bucks when my furnace stopped working because I apparently left the filter in too long. It caused an overheat somewhere and a protector switch shut down my furnace. Unfortunately, it was like a fuse and it needed replacing before my furnace would work again and, boy, it got cold in our house.

Now, I wish it was more of a switch-back-on circuit breaker type rather than a shut-down-the-whole-damned-thing-until-I-could-get-a-technician-out-to-fix-it type protector and it cost me money!

Besides, I had noticed that these type of filters worked no better than the far cheaper fiberglass filters. So I am back to the $1.50 fiberglass ones now and don't worry about it.





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Re: Which of these 3M furnace filters is better and why?
Posted by: Forrest
Date: January 06, 2018 08:20PM
Nobody with alergy's in the house - I use 3M Filtrete 3-Pack Basic, which costs $9 per package.
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