expired Posted by f12_26 | Staff • Aug 1, 2021
Aug 1, 2021 9:28 PM
Item 1 of 6
Item 1 of 6
expired Posted by f12_26 | Staff • Aug 1, 2021
Aug 1, 2021 9:28 PM
6-Pack Crisp AC / Furnace Air Filters MERV 8 (Various Sizes)
& Morefrom $26
$25
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The MERV 13 in the 3M brand has a lower pressure drop (air flow resistance) than their MERV 5, 7, 11, and 12.
3M MERV 5 - 0.23 pressure drop
3M MERV 7 - 0.24 pressure drop
3M MERV 11 - 0.23 pressure drop
3M MERV 12 - 0.22 pressure drop
3M MERV 13 - 0.19 pressure drop
https://www.iallergy.co
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And most of esteem audience here had me convinced better filters are bad..
Is that out of 100 or out of 1? If it's the latter, it's a 5% difference.
Still not much of a difference, just trying to understand the math.
Important to point out (same link) that the basic filter is 34% efficient while the other end is 97% efficient. So it depends on WHY you want to filter (besides keeping junk out of the A/C & heating mechanisms.
I've got bad allergies and on that chart, and 6 out of the 8 filter for "household dust, pollen, dust-mite debris, mold spores, and pet dander" which is my issue. The better filters do not state that they do a better job on those items, they basically just keep adding more to the list (top 3 stay the same).
It says I'm covered with the 3rd one, but I am curious if they do get better for my same allergens with the next one or two up.
My heating guy has basically said the same, don't strain it with something more than you need.
But sticking a cheap one in there and a more expensive one in there is night and day when comparing them after the same amount of time. But comparing a couple of expensive ones (same brand but better version) is minimally different in my "experiments".
But they're not all being compared the same time of year with the same number of days of windows open, air conditioning, or heat either...
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There are some cases where a more restrictive filter can be a problem, and people tend to change cheap filters more regularly (which is most important). That's why it's the standard safe advice that a lot of technicians will provide.
In terms of the deal, Home Depot sells filters that are basically MERV 8 equivalent in 3 packs for about $10. If you buy a 12 pack they are even cheaper per filter. I've seen them branded as Rheem or HDX around me.
What kind of numbers are we talking here? How many watts? How much life reduction? How much additional maintenance?
This is what I'll tell you, last time I used cheap fiberglass filters, my whole house smelled like glue and I had to dust twice as much.
I like to defer to experts, but sometimes I feel like experts are just repeating what they hear or see in their own repair experience.
Two examples: 1. Water installation experts saying magnetic do not change how water leaves behind scale. Not true. Magnetic fields can help to keep calcium from sticking to metal.
2. Vacuum repair saying dyson break all the time when that is the only vacuum worth repairing.
A lot of time, repair people are seeing and remembering the worst case or biased cases. Who is likely yo get a repair? And how does thier lifestyle change what you see? And is it really the biggest deal. Am I better off straining HVAC than dusting twice a weeks and taking allergy medicine every day?
Carry on.
Is that out of 100 or out of 1? If it's the latter, it's a 5% difference.
Still not much of a difference, just trying to understand the math.
That by itself isn't that useful. If you want to know if it matters for your system, you'd first need to know the the maximum static pressure your system was designed to run at. Then you'd need to know the static pressure of your system without a filter is so you know what the ductwork, coils, etc. are contributing. You can then use any filter that when you add it's pressure drop to the rest of the system keeps you under what your system was designed for. The pressure drop increases a lot as the filter gets dirty, so you don't want to be right at the tolerance with a clean filter. Fancy air conditioners will measure this and let you know if the static pressure is too high (meaning the filter is too dirty or you're using too restrictive of a filter).
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It is a fact high MERV# put more stress your ac. Family had 40 years in the filter business.
I've been using MERV 11 for 25+ years on the same AC. Curious what the experts say.
anyone tried this amazon filter before?
also it's been awhile since I get SD alert for "air filter" there used to be home depot deal every once awhile, what happened to that? this is the first alert I get in awhile
The MERV 13 in the 3M brand has a lower pressure drop (air flow resistance) than their MERV 5, 7, 11, and 12.
3M MERV 5 - 0.23 pressure drop
3M MERV 7 - 0.24 pressure drop
3M MERV 11 - 0.23 pressure drop
3M MERV 12 - 0.22 pressure drop
3M MERV 13 - 0.19 pressure drop
https://www.iallergy.com/pages/co...te-filters [iallergy.com]
I use at least a 3m merv 11 the pleats are seriously dense, article validates my theory that the extra surface area cancels out the restriction. Its just a few bucks more per month.
My local store didn't have any but when I went to the store to ask the staff looked into it & they can do a special order for you. However it also depends on their warehouse inventory also.
They're under $10 and merv 8 rated.
https://www.acehardware
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