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
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It is a fact high MERV# put more stress your ac. Family had 40 years in the filter business.
But times do change. HVAC engineers design products to a specification. Almost all modern systems are designed for Merv 8-11. Check your system - it should say.
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And most of esteem audience here had me convinced better filters are bad..
Most systems are intended to work optimally with static pressures of .5 wc or less. So this particular MERV 7 filter uses up about half of that. There are a lot of systems that are oversized for their ductwork, so in those cases you're already dealing with higher pressures and want to keep the filter drop as low as possible.
Think about the fan blowing air. The ductwork, grills, coils in your blower, etc. all add resistance to the fan being able to move air (increase the static pressure). The higher the static pressure, the harder your system has to work and the less efficient it is. If you have an older system with a PSC blower motor as the pressure increases it just moves less air. In a worst case scenario, it's possible that it won't move enough air to prevent your coils from freezing up or your furnace from overheating. This can also happen if you never change your filter and it gets too clogged up.
A higher pressure drop can be correlated to higher MERV ratings (particularly in cheaper filters), but as these numbers show it's not always the case. If you really want to run high MERV filters (most people without pets or respiratory conditions won't need to), the general recommendation is to use a 4" or 5" deep filter. The deeper filter helps reduce the pressure drop.
Edit: Also systems aren't designed to MERV specifications as filters with the same MERV rating can have vastly different pressure drops. Most people with newer systems won't be in a situation where a slightly higher MERV filter reduces the lifespan of their equipment meaningfully. Most people will also not benefit from a super high MERV filter and are just paying more. The most important thing is to change your filter regularly!
And most of esteem audience here had me convinced better filters are bad..
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And most of esteem audience here had me convinced better filters are bad..
If you read the comments here and came away with "better filters are bad", then you missed the point. Use what's appropriate and don't go above your HVAC manufacturer's recommendations unless you've really done your homework and know what you're doing.
As someone who replaced their entire HVAC system last year, I know firsthand the expense that comes with that replacement.
So it is magic? No— the expensive higher merv filters use much higher pleating increasing overall surface area of the filter material. Though air resistance pressure per square inch for higher merv filters may be higher than those of lower merv filters, but the increased surface area of the higher merv filters compensate for that.
Most systems are intended to work optimally with static pressures of .5 wc or less. So this particular MERV 7 filter uses up about half of that. There are a lot of systems that are oversized for their ductwork, so in those cases you're already dealing with higher pressures and want to keep the filter drop as low as possible.
Think about the fan blowing air. The ductwork, grills, coils in your blower, etc. all add resistance to the fan being able to move air (increase the static pressure). The higher the static pressure, the harder your system has to work and the less efficient it is. If you have an older system with a PSC blower motor as the pressure increases it just moves less air. In a worst case scenario, it's possible that it won't move enough air to prevent your coils from freezing up or your furnace from overheating. This can also happen if you never change your filter and it gets too clogged up.
A higher pressure drop can be correlated to higher MERV ratings (particularly in cheaper filters), but as these numbers show it's not always the case. If you really want to run high MERV filters (most people without pets or respiratory conditions won't need to), the general recommendation is to use a 4" or 5" deep filter. The deeper filter helps reduce the pressure drop.
If you read the comments here and came away with "better filters are bad", then you missed the point. Use what's appropriate and don't go above your HVAC manufacturer's recommendations unless you've really done your homework and know what you're doing.
As someone who replaced their entire HVAC system last year, I know firsthand the expense that comes with that replacement.
I guess regular filters and my 3 winnix purifiers will have to do.
BTW is there better way to tag and respond to multiple instead of quoting?
There is a guy on youtube who tested all the filters and concluded that improved filtering was based on the thickness of your air filter. So a 14x25x1 is good but a 14x25x2 or 14x25x4 is even better. Most furnaces/air handlers do not have room for thicker air filters. So most including me are stuck with the 1" filters.
You want a filter that will not restrict air flow but restrict dust and particles efficiently. The simple solution is by the cheapest filters that are pleated and change them once a month instead of once over 3 months.
The real Merv 11 filters are sometimes yellow/orange in color but not always. The media aka. filter material is very thick and not transparent.
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I've been using MERV 11 for 25+ years on the same AC. Curious what the experts say.
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