18x20x1 Air Filter Market Report: Sales Volume, Market Share, Leading Brands & Market Trends
18x20x1 Air Filter sales on Amazon US totaled 65,650 units in July 2026 (▲ 14.7% vs. the prior month), generating an estimated $2,167,180 in revenue across the 50 top-ranked ASINs for this search term. Demand is heavily concentrated at the top of the ranking — the ten best performers capture 86.8% of unit volume and 83.3% of revenue, while a typical listing is priced at $42.17. The keyword itself pulled 20,826 Amazon queries over the same period (▼ 2.1% MoM).
Zooming out to the 12-month window ending July 2026, the 18x20x1 air filter Top 50 moved 653,700 units and $21,913,918 in cumulative sales — an average of 54,475 units and $1,826,160 per month. Monthly throughput topped out at 65,650 units in July 2026 and dipped to 32,500 in May 2026, leaving the latest reading 9.0% higher than August 2025.
18x20x1 Air Filter Sales Trend (Trailing 12 Months)
Based on the top 50 ASINs by monthly sales for this keyword
2025/08
2025/09
2025/10
2025/11
2025/12
2026/01
2026/02
2026/03
2026/04
2026/05
2026/06
2026/07
Monthly Sales 2026/07
65.7K
▲ 14.7% MoM
Monthly Revenue 2026/07
$2.2M
▲ 13.0% MoM
Top 10 Market Share 2026/07
86.8%
18x20x1 Air Filter Market Share & Sales Concentration on Amazon US — July 2026
The most-sold 18x20x1 air filter listing on Amazon US in July 2026 is ASIN B088BZTYFP (Brand: Amazon Basics), which sold 10,000 units at $35.07 apiece — equal to 15.2% of every unit tracked in this report.
The Top 10 ASINs account for 57,000 units and $1,805,340 in July 2026 — 86.8% of unit volume and 83.3% of revenue among all 50 ranked ASINs in this report.
Sales Volume of Top ASINs for '18x20x1 Air Filter' on Amazon
July 2026
Is 86.8% Top 10 share highly concentrated?
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Top 5 Volume Share breakdown
B088BZTYFP
Amazon Basics 16x20x1 Air Filter 6-Pack, MERV 8 AC Furnace Filters, Allergen Control , Removes Dust, Lint and Pollen, Electrostatic (Actual Size: 15.75" x 19.75" x 0.75")
10K
▲ 0.0%vs. prior month
$278.5K
latest month
12-month trend
B004Q6EZYQ
Filtrete 20x20x1 Air Filter, MERV 11, MPR 1000, Allergens & Pet Dander, 3-Month AC and Furnace Filters, Cleaner Air, Reliable Airflow, 2 HVAC Filters (Actual Size 19.68 x 19.68 x 0.81 in)
10K
▲ 42.9%vs. prior month
$296.2K
latest month
12-month trend
B01CSWPVME
Aerostar Air Filter 20x20x1 MERV 8 AC Filter, HVAC, Furnace Filter, 6 Pack | ACTUAL SIZE (19.75 x 19.75 x 0.75) AC Filter, HVAC, Furnace Filter Captures Dust, Lint & Pollen MERV 8 (MPR 600)
10K
▲ 0.0%vs. prior month
$311.9K
latest month
12-month trend
B07FNXS7G9
Filtrete 20x20x1 Air Filter MERV 5, 6-Pack AC Furnace HVAC, MPR 300 Basic Dust Defense, Pleated Electrostatic, Removes Lint
10K
▲ 42.9%vs. prior month
$353.3K
latest month
12-month trend
B07FP5X5G2
Filtrete 16x20x1 Air Filter MERV 5, 6-Pack AC Furnace HVAC, MPR 300 Basic Dust Defense, Pleated Electrostatic, Removes Lint
8K
▲ 14.3%vs. prior month
$247.9K
latest month
12-month trend
B01CSWQ8EE
Aerostar Air Filter 18x20x1 MERV 8 AC Filter, HVAC, Furnace Filter, 6 Pack | ACTUAL SIZE (17.50 x 19.50 x 0.75) AC Filter, HVAC, Furnace Filter Captures Dust, Lint & Pollen MERV 8 (MPR 600 )
2K
▲ 100.0%vs. prior month
$64.5K
latest month
12-month trend
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Best 18x20x1 Air Filter Brands on Amazon US — Top 3 Brand Sales Concentration (July 2026)
Filtrete is the best-performing 18x20x1 air filter brand in July 2026, moving 33,000 units across 6 ASINs for 57.9% of Top 10 volume. Aerostar follows with 12,000 units (21.1%), ahead of Amazon Basics on 10,000 units (17.5%).
With 4 brands splitting the Top 10 and 96.5% of volume sitting with three of them, this is a concentrated shelf — the leaders hold multiple listings or one very high-velocity ASIN, so a new entrant competes against established review moats rather than an open field. Average selling prices among the leaders run from $32.95 to $35.07, which frames the price band a competing listing has to justify.
Brand share of Top 10 volume
Filtrete
6 ASINs in Top 10
57.9%
Units
33K
Revenue
$1.1M
Avg. price
$34.97
B004Q6EZYQ
$29.62·★4.8·58.2K revsFiltrete 20x20x1 Air Filter, MERV 11, MPR 1000, Allergens & Pet Dander, 3-Month AC and Furnace Filters, Cleaner Air, Reliable Airflow, 2 HVAC Filters (Actual Size 19.68 x 19.68 x 0.81 in)
Units sold10KB07FNXS7G9
$39.41·★4.7·161K revsFiltrete 20x20x1 Air Filter MERV 5, 6-Pack AC Furnace HVAC, MPR 300 Basic Dust Defense, Pleated Electrostatic, Removes Lint
Units sold10KB07FP5X5G2
$33.84·★4.7·161K revsFiltrete 16x20x1 Air Filter MERV 5, 6-Pack AC Furnace HVAC, MPR 300 Basic Dust Defense, Pleated Electrostatic, Removes Lint
Units sold8KB07CTPTG7Z
$22.46·★4.8·58.2K revsFiltrete 18x24x1 Air Filter, MERV 11, MPR 1000, Allergens & Pet Dander, 3-Month AC and Furnace Filters, Cleaner Air, Reliable Airflow, 2 HVAC Filters (Actual Size 17.68 x 23.68 x 0.81 in)
Units sold2KB0B1PFJ1Z4
$40.51·★4.7·6.5K revsFiltrete 16x20x1 AC Furnace Air Filter, MERV 8, MPR 700, Tough on Pollen, Easy on Airflow, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4-Pack (Actual Size 15.688 x 19.688 x 0.78 in)
Units sold2KB005F5D1JC
$43.98·★4.8·25.7K revsFiltrete 18x20x1 Air Filter, MERV 11, MPR 1000, Allergens & Pet Dander, 3-Month AC and Furnace Filters, Cleaner Air, Reliable Airflow, 4 HVAC Filters (Actual Size 17.68 x 19.68 x 0.81 in)
Units sold1K
Aerostar
2 ASINs in Top 10
21.1%
Units
12K
Revenue
$376.4K
Avg. price
$32.95
B01CSWPVME
$31.93·★4.7·12.2K revsAerostar Air Filter 20x20x1 MERV 8 AC Filter, HVAC, Furnace Filter, 6 Pack | ACTUAL SIZE (19.75 x 19.75 x 0.75) AC Filter, HVAC, Furnace Filter Captures Dust, Lint & Pollen MERV 8 (MPR 600)
Units sold10KB01CSWQ8EE
$33.96·★4.7·2.1K revsAerostar Air Filter 18x20x1 MERV 8 AC Filter, HVAC, Furnace Filter, 6 Pack | ACTUAL SIZE (17.50 x 19.50 x 0.75) AC Filter, HVAC, Furnace Filter Captures Dust, Lint & Pollen MERV 8 (MPR 600 )
Units sold2K
Amazon Basics
1 ASIN in Top 10
17.5%
Units
10K
Revenue
$278.5K
Avg. price
$35.07
B088BZTYFP
$35.07·★4.6·10K revsAmazon Basics 16x20x1 Air Filter 6-Pack, MERV 8 AC Furnace Filters, Allergen Control , Removes Dust, Lint and Pollen, Electrostatic (Actual Size: 15.75" x 19.75" x 0.75")
Units sold10K
Trending 18x20x1 Air Filter Products — Growth Leaders & New Top 10 Entrants
Based on July 2026 data, this shortlist surfaces the two kinds of ASIN worth keeping an eye on — the ones that just broke into the Top 10, and the ones growing fastest month over month. On the growth side, B07FPB8Q8V leads positive momentum with ▲ 500.0% MoM growth on 300 units, with B01CSWQ8EE close behind at ▲ 100.0% MoM on 2K units.
The two signals carry different weight. A fresh entrant means share has already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date. A steep growth rate works as the earlier warning: it marks demand that is still compounding, usually a month or two before the ranking catches up to it.
B07FPB8Q8V
Filtrete 18x20x1 AC Furnace Air Filter, MERV 11, MPR 1000, Micro Allergen Defense, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 6 Pack (Actual Size 17.81x19.81x0.81 in)
Price
$67.00
Rating
4.8
Reviews
11.9K
Latest month sales
B01CSWQ8EE
Aerostar Air Filter 18x20x1 MERV 8 AC Filter, HVAC, Furnace Filter, 6 Pack | ACTUAL SIZE (17.50 x 19.50 x 0.75) AC Filter, HVAC, Furnace Filter Captures Dust, Lint & Pollen MERV 8 (MPR 600 )
Price
$33.96
Rating
4.7
Reviews
2.1K
Latest month sales
B0B1PFJ1Z4
Filtrete 16x20x1 AC Furnace Air Filter, MERV 8, MPR 700, Tough on Pollen, Easy on Airflow, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4-Pack (Actual Size 15.688 x 19.688 x 0.78 in)
Unlock to view ASIN details and product titles
Price
$40.51
Rating
4.7
Reviews
6.5K
Latest month sales
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