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Thread: Furnace Filter MEGA THREAD

  1. #1
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    Default Furnace Filter MEGA THREAD

    You know you want it. Furnace Filter prices, sizes, strategies and questions. All your most pressing furnace filter needs in one place, finally.
    @blitz , @LilDrunkenSmurf , @ThePenIsMightier , @killramos , @firebane

    Quote Originally Posted by ExtraSlow View Post
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    Fight the furnace filter confusopoly. Have two cases of filters. Merv11 for winter and Merv8 for summer. $90 total for 12 filters and that'll last me 18 months or so.
    Attachment 87721
    Quote Originally Posted by blitz View Post
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    12 filters would last me 6 years
    Quote Originally Posted by ExtraSlow View Post
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    I use crappy ones in the summer and change quite often. My AC freezes if I use good ones or let them get clogged.

    Winter I can use better and change a little less.

    Maybe my 18 months was too short. More like 2 years.
    Quote Originally Posted by LilDrunkenSmurf View Post
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    Where from?
    Quote Originally Posted by ExtraSlow View Post
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    Amazon.
    Attachment 87734

    Amre has some good value too, but I wasn't going to be near there.
    Quote Originally Posted by ThePenIsMightier View Post
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    Why not the 11's for summer because it's dustier and 8's for winter?
    Try it. Trust me. Change in summer more often because baller deals and steady income, double-meat dollars.
    Quote Originally Posted by killramos View Post
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    I would say increased airflow in the home is way more important in winter than summer.
    Quote Originally Posted by ExtraSlow View Post
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    If you guys want to talk about airflow and filter selection, I could discuss for DAAAAAYS. I'm happy with my system and it works for my situation.
    Quote Originally Posted by firebane View Post
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    Want a puzzler? Why build a filter box that doesn't fit a 1" filter or a 2" filter properly so you buy 1" filters and use foam on them to create a tight seal?

    On top of that why build a filter box that is 25x30x1 that is a non-standard size so you can't buy filters in normal places.

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    Ok.

    1” filters vs the extra wide 4”+.

    Been on the big ones for a while, they seem to result in more system airflow which is the biggest issue with my HVAC.
    Originally posted by Thales of Miletus

    If you think I have been trying to present myself as intellectually superior, then you truly are a dimwit.
    Originally posted by Toma
    fact.

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    Been running the cheap Duststop filters from Canadian Tire, 6$ for a pack of 3.
    https://www.canadiantire.ca/en/pdp/d...?rrec=true#spc
    House is 5 years old on a newer community, our home builder recommended changing filters on a monthly basis due to all constructions.
    Have one dog and hardwood floor most of the house.
    Also our house is right behind Country Hills so still lots of constructions.

    I just buy 2-3 packs every 6 months and try to replace every 30-45 days.

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    Quote Originally Posted by killramos View Post
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    Ok.

    1” filters vs the extra wide 4”+.

    Been on the big ones for a while, they seem to result in more system airflow which is the biggest issue with my HVAC.
    Yours fits either size? Neat. I don't think mine would. Although now that I say that, I'm not certain how wide it might open.
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    Yea it’s got a foam strip all along the top that slows you to put anything up to 5” or so and hold it in place without the air bypassing.

    Ran 1”’s in it for years, recently switched to 4” and seem to be getting more airflow but more definitively they last much longer

    Probably use 4 a year and they are fairly dirty coming out. Just buy a big pack of them on amazon.
    Originally posted by Thales of Miletus

    If you think I have been trying to present myself as intellectually superior, then you truly are a dimwit.
    Originally posted by Toma
    fact.

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    PO installed some electrical reusable filter, but has no instructions on how to clean it, so I've swapped to the disposable ones. Replace every 3 months, but I have 2 furnaces in my place. Older home, built in 82. Dog and mix of hardwood and carpet.
    Quote Originally Posted by heavyfuel View Post
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    That's why I just say I have a 4" dick and lift weights to make up for it.

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    Quote Originally Posted by killramos View Post
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    Yea it’s got a foam strip all along the top that slows you to put anything up to 5” or so and hold it in place without the air bypassing.

    Ran 1”’s in it for years, recently switched to 4” and seem to be getting more airflow but more definitively they last much longer
    I'm shocked you're getting more airflow. Any time you add more restriction to the air path your airflow should decrease. Unless you have an ECM motor in your furnace that can ramp up with the added static pressure.

    All things equal your thicker filter will decrease airflow. This is true when i run those allergy filters versus a cheap merv 8, airflow out of the vents is noticeably different.

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    I always wait for Amazon to have a sale on the filtrete ones.
    I grab this one for $35 and it lasts me easily 2 years
    https://www.amazon.ca/Filtrete-16x25...2s9dHJ1ZQ&th=1

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    This guy did some testing, and measured airflow. Nothing earth-shattering, but may be of interest.

    https://www.youtube.com/watch?v=GoOKjINPgpY&t=1s

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    Quote Originally Posted by Ca_Silvia13 View Post
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    I'm shocked you're getting more airflow. Any time you add more restriction to the air path your airflow should decrease. Unless you have an ECM motor in your furnace that can ramp up with the added static pressure.

    All things equal your thicker filter will decrease airflow. This is true when i run those allergy filters versus a cheap merv 8, airflow out of the vents is noticeably different.
    A 4” filter provides increased airflow not the other way around. It’s a pleated filter so it has more surface area with same same filter media = lower pressure drop.

    More surface area also means it gets clogged way less quickly so the increased airflow lasts longer than an equivalent 1”.

    The issue with the “fancy” filters that capture smaller particles is the filter medium is much more dense which causes increased pressure drop. Theoretically you should be able to run a 4” filter with a better filter medium and get the same pressure drop over the filter as a 1” with shitty medium.

    You really should run the biggest filter your furnace allows.

    (I think this is the closest to real engineering I have done all year lol)
    Last edited by killramos; 10-04-2019 at 09:38 AM.
    Originally posted by Thales of Miletus

    If you think I have been trying to present myself as intellectually superior, then you truly are a dimwit.
    Originally posted by Toma
    fact.

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    Quote Originally Posted by Ca_Silvia13 View Post
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    I'm shocked you're getting more airflow. Any time you add more restriction to the air path your airflow should decrease. Unless you have an ECM motor in your furnace that can ramp up with the added static pressure.

    All things equal your thicker filter will decrease airflow. This is true when i run those allergy filters versus a cheap merv 8, airflow out of the vents is noticeably different.
    Although the 4 or 5" filters look much thicker, the actual medium that the air passes through is roughly the same thickness. The benefit of the 4" or 5" filters is that you can go longer between changes because the "valleys" in the pleated filter material can hold more debris before airflow starts to drop.

    Merv-Flter.jpg
    ---

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    Quote Originally Posted by killramos View Post
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    Ok.

    1” filters vs the extra wide 4”+.

    Been on the big ones for a while, they seem to result in more system airflow which is the biggest issue with my HVAC.
    This man gets it.

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    If you are not buying filters wholesale, you are paying 10x too much. Go to Dafco or BGE filters here in Calgary and learn the ridiculous markup retail stores have on air filters. Buy a full box of filters for yourself or split it up with family and friends.

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    Quote Originally Posted by Asian_defender View Post
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    I always wait for Amazon to have a sale on the filtrete ones.
    I grab this one for $35 and it lasts me easily 2 years
    https://www.amazon.ca/Filtrete-16x25...2s9dHJ1ZQ&th=1
    Is there a way to get notified when it goes on sale.. wouldn't mind snagging a pack of 6 for 35$ and not having to go to Canadian Tire

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    ^ use camel camel camel




    I'll add that I'm pretty happy with the filters from https://purefilters.ca/

    Would recommend them for well priced quality filters if you don't want to wait for sales.

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    Quote Originally Posted by Darell_n View Post
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    If you are not buying filters wholesale, you are paying 10x too much. Go to Dafco or BGE filters here in Calgary and learn the ridiculous markup retail stores have on air filters. Buy a full box of filters for yourself or split it up with family and friends.
    Totally agree

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    What happens if you don't run a filter? Just raw, unbridled horsepower screaming through the vents.
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    Not much you can do about the air outside your house. Worst case is your whole family gets sick and your furnace gets damaged, best case is you save a few bucks... so maybe if you're a gamblin' man?

    I sometimes febreze my filters a day or two before changing them, freshens up the whole house. I really don't like forced air systems though. My old condo had geothermal/radiant, that's the way to go.

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    Quote Originally Posted by SKR View Post
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    What happens if you don't run a filter? Just raw, unbridled horsepower screaming through the vents.
    You'll have to dust more often. That's about it.(unless a family member has allergies, then they'll be sneezing a lot more)

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    Quote Originally Posted by Darell_n View Post
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    If you are not buying filters wholesale, you are paying 10x too much. Go to Dafco or BGE filters here in Calgary and learn the ridiculous markup retail stores have on air filters. Buy a full box of filters for yourself or split it up with family and friends.
    Interested in this. How many filters would come in a full box? 12, or more? Thanks!

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