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frontpageneomatrixviper posted Today 01:51 AM
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frontpageneomatrixviper posted Today 01:51 AM

Costco Members: 2-Pk 3M Filtrete 4" MPR 1900 MERV 13 Air Filters

& More + Free S&H

From $38

$48

Costco Wholesale
16 Comments 3,537 Views
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Deal Details
Costco Wholesale has for their Members: 2-Pack 3M Filtrete 4" MPR 1900 MERV 13 Premium Allergen, Bacteria & Virus Air Filters (various sizes) on sale listed below from $37.99 listed below. Shipping is free.

Thanks to community member neomatrixviper for finding this deal.

Note, must login to your Costco account w/ an active membership to purchase (5% for Non-Member Service/Surcharge Fee)

Available:
  • 16"x20"x4"
    • Regular Fit $39.99
  • 16"x25"x4"
    • Regular Fit $39.99
    • Slim Fit $37.99
  • 20"x20"x4"
    • Regular Fit $39.99
  • 20"x25"x4"
    • Regular Fit $39.99
    • Slim Fit $37.99
About this item:
  • 1900 MPR and MERV 13 Rating
  • Designed With Filtrete 3-in-1 Technology
  • Helps Capture Countless Microparticles Such as Pet Dander, Smoke, and Bacteria
  • Also Captures Large Particles Like Lint, Pollen, and Household Dust
  • This Furnace Filter is Certified Asthma and Allergy-friendly

Editor's Notes

Written by Discombobulated | Staff
  • Rated 4.7 out of 5 stars based on over 160 Costco customer reviews.
  • Products can be returned to any of the 800+ Costco warehouses locations worldwide.
  • If you don't have a Costco Warehouse Membership, you can sign up here
  • Offer valid through June 7, 2026 or while pricing/supplies last

Original Post

Written by neomatrixviper
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Costco Wholesale has for their Members: 2-Pack 3M Filtrete 4" MPR 1900 MERV 13 Premium Allergen, Bacteria & Virus Air Filters (various sizes) on sale listed below from $37.99 listed below. Shipping is free.

Thanks to community member neomatrixviper for finding this deal.

Note, must login to your Costco account w/ an active membership to purchase (5% for Non-Member Service/Surcharge Fee)

Available:
  • 16"x20"x4"
    • Regular Fit $39.99
  • 16"x25"x4"
    • Regular Fit $39.99
    • Slim Fit $37.99
  • 20"x20"x4"
    • Regular Fit $39.99
  • 20"x25"x4"
    • Regular Fit $39.99
    • Slim Fit $37.99
About this item:
  • 1900 MPR and MERV 13 Rating
  • Designed With Filtrete 3-in-1 Technology
  • Helps Capture Countless Microparticles Such as Pet Dander, Smoke, and Bacteria
  • Also Captures Large Particles Like Lint, Pollen, and Household Dust
  • This Furnace Filter is Certified Asthma and Allergy-friendly

Editor's Notes

Written by Discombobulated | Staff
  • Rated 4.7 out of 5 stars based on over 160 Costco customer reviews.
  • Products can be returned to any of the 800+ Costco warehouses locations worldwide.
  • If you don't have a Costco Warehouse Membership, you can sign up here
  • Offer valid through June 7, 2026 or while pricing/supplies last

Original Post

Written by neomatrixviper

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16 Comments

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Today 06:16 AM
359 Posts
Joined Nov 2020
drl136usToday 06:16 AM
359 Posts
Would these been good for making a Corsi-Rosenthal Box? I've been wanting to try one out for a few years, but Merv 13 20x20x2 4-packs are just too expensive after 2020.
Today 06:19 AM
168 Posts
Joined Jul 2024
RelaxedCreature628Today 06:19 AM
168 Posts
Get the 20"x20" size and tape it onto box fan for a poor man HEPA air cleaner.
1
Today 10:51 AM
811 Posts
Joined Aug 2008
ironman69Today 10:51 AM
811 Posts
Quote from drl136us :
Would these been good for making a Corsi-Rosenthal Box? I've been wanting to try one out for a few years, but Merv 13 20x20x2 4-packs are just too expensive after 2020.
Yes, I am running two of them right now with similar filters. They last about 6 months before you need to rebuild them. Pro tip, save the box they come in to use for the build and pair it with a smart plug.
Last edited by ironman69 May 15, 2026 at 03:55 AM.
Today 11:01 AM
1,469 Posts
Joined Aug 2007
paulk11087Today 11:01 AM
1,469 Posts
Quote from ironman69 :
Yes, I am running two of them right now with similar filters. They last about 6 months before you need to rebuild them. Pro tip, save the box they come in to use for the build and pair it with a smart plug.
Is there a preferred box fan for use or any will do?
Today 11:13 AM
164 Posts
Joined Jan 2014
rocCityToday 11:13 AM
164 Posts
This will work but 20"x20"x2" MERV 13 filters are more ideal for Corsi‑Rosenthal boxes. Air flow will be restricted with 4"
Today 12:26 PM
811 Posts
Joined Aug 2008
ironman69Today 12:26 PM
811 Posts
Quote from rocCity :
This will work but 20"x20"x2" MERV 13 filters are more ideal for Corsi‑Rosenthal boxes. Air flow will be restricted with 4"
Just so you know, larger or thicker AC air filters (such as 4-5 inch filters) generally do not restrict airflow more than thin (1-inch) filters; in fact, they usually improve airflow and reduce strain. That's physics. It is the higher MERV rating that makes it more restrictive.
Last edited by ironman69 May 15, 2026 at 05:29 AM.
Today 12:27 PM
811 Posts
Joined Aug 2008
ironman69Today 12:27 PM
811 Posts
Quote from paulk11087 :
Is there a preferred box fan for use or any will do?
Any full sized one will do. I buy whatever is on sale.

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Today 01:27 PM
157 Posts
Joined Jul 2017
TheProdigalWizardToday 01:27 PM
157 Posts
in for 1
Today 01:32 PM
59 Posts
Joined Jul 2015
los1532Today 01:32 PM
59 Posts
very nice
Today 01:38 PM
224 Posts
Joined Jun 2015
compu_tipToday 01:38 PM
224 Posts
Quote from rocCity :
This will work but 20"x20"x2" MERV 13 filters are more ideal for Corsi‑Rosenthal boxes. Air flow will be restricted with 4"
This doesn't make sense to me. Can you elaborate? A 4" filter is going to have more surface area than a 2" filter, isn't it?
Today 01:49 PM
1,426 Posts
Joined Jan 2015
Deal_Hunter_XToday 01:49 PM
1,426 Posts
wow nice price, almost half of what I paid previously, stocking up, thanks OP!
Today 02:22 PM
164 Posts
Joined Jan 2014
rocCityToday 02:22 PM
164 Posts
Quote from ironman69 :
Just so you know, larger or thicker AC air filters (such as 4-5 inch filters) generally do not restrict airflow more than thin (1-inch) filters; in fact, they usually improve airflow and reduce strain. That's physics. It is the higher MERV rating that makes it more restrictive.
Thicker filters can reduce pressure drop in HVAC systems because those blowers are designed for high static pressure. But a Corsi‑Rosenthal box uses a box fan, which performs very differently. With a box fan, 4″ filters actually increase resistance and reduce airflow compared with 2″ filters. UC Davis testing on CR boxes shows 2″ MERV‑13 filters give better airflow and CADR than 1″, and going thicker doesn't add benefit because the CR box already increases surface area by using multiple filters. Here's a link to the inventor's walkthrough for anyone interested. https://engineering.ucdavis.edu/n...enthal-box
Today 02:27 PM
164 Posts
Joined Jan 2014
rocCityToday 02:27 PM
164 Posts
Quote from paulk11087 :
Is there a preferred box fan for use or any will do?
https://www.walmart.com/ip/Lasko-...a2409ff1b7

I am using something like this.
Today 02:32 PM
1,613 Posts
Joined Jan 2011
TollerToday 02:32 PM
1,613 Posts
How do I order as a non-member? I realize there is a 5% premium, but checkout requires a password.

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Today 02:33 PM
21 Posts
Joined Apr 2009
dove91Today 02:33 PM
21 Posts
nice, thanks

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