Is MERV 13 too restrictive for my furnace?

MERV 13 is denser than the MERV 8 filters many systems ship with. Most modern residential blowers handle it, but older or undersized systems may see reduced airflow. Check your furnace manual's maximum MERV rating before switching.

How often should I change it?

Most homes change a 1-inch MERV 13 filter every 2 to 3 months. Homes with pets or heavy dust may need monthly changes; one buyer reported about 8 months of use before replacement.

Does the charcoal layer really remove odors?

It helps with light cooking, pet and smoke odors while the filter is fresh. The charcoal and baking soda layers are thin and lose effectiveness before the media loads up, so don't expect whole-house odor removal.

Will it fit my 20x20x1 slot?

Yes, it is a nominal 20x20x1 filter, the common size for 1-inch return grilles and furnace slots. Actual dimensions can run slightly under nominal, so measure your slot before ordering.

How does it compare to a MERV 8 filter?

MERV 13 captures smaller particles, including fine smoke and bacteria-sized matter, than MERV 8. The trade-off is higher airflow resistance and a higher price per filter.

Is $76.29 for two filters a good price?

That works out to about $38 per filter, roughly in line with other MERV 13 two-packs. Only one store listed it new as of November 7, 2026, so compare against other MERV 13 brands before buying.

What do buyers say about the PUREFLOW Home Furnace Air Filter 20x20x1 MERV-13 (2-Pack)?

Rated 4.9 out of 5 from 9 ratings. Buyers like: Virtually eliminated dust and odors; Excellent filtering; Delivery on time. Common complaints: One reviewer found it too soon to judge after 4 days.

Where can I buy the PUREFLOW Home Furnace Air Filter 20x20x1 MERV-13 (2-Pack)?

2 stores we checked sell it, including Walmart, PUREFLOW AIR.

PUREFLOW Home Furnace Air Filter 20x20x1 MERV-13 (2-Pack)

Q: Where is the PUREFLOW Home Furnace Air Filter 20x20x1 MERV-13 (2-Pack) cheapest?

At Walmart, for $76.29, as of our latest check.

Best price now

$76.29at WalmartObserved at 9:51 PM

Prices are checked against each store and labelled with when.

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What reviewers say

Buyers report the filter cut visible dust and household odors and held up for months of use. Several compare it favorably to high-HEPA filters from big-box stores on build and noise.

What people mention

Dust capturePraisedBuyers say it noticeably cut dust settling in the home.
Odor controlPraisedOwners report cooking, pet and smoke odors were reduced.
Build qualityPraisedReviewers describe it as more solid than big-box high-HEPA filters.
NoisePraisedOne buyer says the system runs quieter than with store filters.
LongevityMixedOne owner saw about 8 months of service; another said 4 days was too soon to judge.

About the PUREFLOW Home Furnace Air Filter 20x20x1 MERV-13 (2-Pack)

PUREFLOW® Ultra+ Home Air Filters deliver premium air filtration for homes that demand high-performance HVAC protection. Featuring MERV 13 filtration with a high-grade layer of activated charcoal, Ultra+ is designed to capture fine airborne particles while helping manage common household odors—supporting a fresher indoor environment and consistent HVAC performance.

• MERV 13 FILTRATION PERFORMANCE. PUREFLOW Home Air Filters are designed to capture dust, pollen, pet dander, lint, smoke, fumes, and other fine airborne particles for higher-efficiency home air filtration.

• HELPS MANAGE HOUSEHOLD ODORS. Built with an activated charcoal layer to help reduce common indoor odors from cooking, pets, smoke, and everyday household activity.

• SUPPORTS CLEANER INDOOR AIR. Multi-layer filtration media helps reduce particles moving through your HVAC system, making these filters a practical choice for homes with pets, kids, guests, or higher daily activity.

• BALANCED AIRFLOW DESIGN. Engineered to support consistent airflow through your residential furnace, air conditioner, or HVAC system while helping maintain efficient heating and cooling performance.

• ADVANCED FILTER MEDIA. High-efficiency MERV 13 construction captures smaller airborne particles than many standard filters, while also helping protect your HVAC system from dust buildup.

What buyers say

Buyers like