=?iso-8859-15?Q?Tekkie=AE?= writes:
Frank posted for all of us...


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On 2/4/2019 7:23 PM, Ed Pawlowski wrote:
For the first time in 53 years of owning homes, my new house has a=20
furnace and uses filters.=A0 It takes a 1" filter.
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I see prices can vary considerably but is a MERV 8 and MERV 8 regardles=
s=20
of the brand?=A0 Should I use MERV 8 or MERV 11?=A0 We have no pets.
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I see filters with MERV 11 rating from $9.95 ($7.45ea by a dozen) to=20
$14.50. Any real difference if they have the same rating?
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Discount filters seems cheapest.
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I use air filters and had never heard the term MERV so looked up your=20
question:
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https://airexpertsnj.com/knowledge/e...nce-between-m=
erv-8-and-merv-11-filters
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Prompted me to look at the filters I'm using and now see that they are=20
MERV 11. Don't know about price difference but sometimes filter may=20
collapse somewhat and more expensive filter might be sturdier.

I am no filter expert but IIRC if the MERV number is increased then possibl=
y=20
the blower motor can overload. Research the info on your system to determin=
e=20
the suitability.

A dirty filter:

1) Reduces the airflow available to the heat exchanger. This could result
in the high-limit switch opening, which will increase the cycle time
(and blow colder air util the high-limit switch closes after the heat
exchanger cools sufficiently, rinse and repeat).

2) Causes the blower to work harder, which consumes additional power and
prematurely ages the blower.