18x18x1 Air Filter Market Report: Sales Volume, Market Share, Leading Brands & Market Trends
18x18x1 Air Filter sales on Amazon US totaled 17,250 units in July 2026 (▲ 17.7% vs. the prior month), generating an estimated $722,647 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 74.2% of unit volume and 74.8% of revenue, while a typical listing is priced at $44.93. The keyword itself pulled 15,145 Amazon queries over the same period (▼ 9.4% MoM).
Zooming out to the 12-month window ending July 2026, the 18x18x1 air filter Top 50 moved 156,450 units and $6,696,706 in cumulative sales — an average of 13,038 units and $558,059 per month. Monthly throughput topped out at 17,250 units in July 2026 and dipped to 8,050 in May 2026, leaving the latest reading 8.8% higher than August 2025.
18x18x1 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
17.3K
▲ 17.7% MoM
Monthly Revenue 2026/07
$722.6K
▲ 23.6% MoM
Top 10 Market Share 2026/07
74.2%
18x18x1 Air Filter Market Share & Sales Concentration on Amazon US — July 2026
The most-sold 18x18x1 air filter listing on Amazon US in July 2026 is ASIN B00CJZ8EKW (Brand: Filterbuy), which sold 2,000 units at $41.96 apiece — equal to 11.6% of every unit tracked in this report.
The Top 10 ASINs account for 12,800 units and $540,713 in July 2026 — 74.2% of unit volume and 74.8% of revenue among all 50 ranked ASINs in this report.
Sales Volume of Top ASINs for '18x18x1 Air Filter' on Amazon
July 2026
Is 74.2% Top 10 share highly concentrated?
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Top 5 Volume Share breakdown
B00CJZ8EKW
Filterbuy 18x24x1 Air Filter MERV 8 Dust & Allergy Defense (4-Pack) | Electrostatic Pleated HVAC AC Furnace Filters Replacement, Made in USA (Actual Size: 17.38 x 23.38 x 0.75)
2K
▲ 100.0%vs. prior month
$82.6K
latest month
12-month trend
B07FQHYTC9
Filtrete 18x18x1 Air Filter MERV 5, 6-Pack AC Furnace Filters for Home HVAC, MPR 300
2K
▲ 0.0%vs. prior month
$55.9K
latest month
12-month trend
B09RHMBGVX
Simply 18x18x1 Air Filter, Merv 8, 6 Pack, For Home AC Furnace & HVAC (Actual Size: 17.75"x17.75"x0.75") DUST, Pet, & Allergy Control
2K
▲ 0.0%vs. prior month
$76K
latest month
12-month trend
B09XGDZQNG
BNX TruFilter 20x25x1 Air Filter MERV 13 AC Filter, HVAC Furnace Filter, 6 Pack (ACTUAL SIZE 19.68"x24.68"x0.75") Allergies, Dust, Pet Dander & Smoke - MADE IN USA - MPR1500 / FPR 10
2K
▲ 100.0%vs. prior month
$123.8K
latest month
12-month trend
B00CJZ8CTK
Filterbuy 18x18x1 Air Filter MERV 8 Dust & Allergy Defense (4-Pack) | Electrostatic Pleated HVAC AC Furnace Filters Replacement, Made in USA (Actual Size: 17.75 x 17.75 x 0.75)
1K
▲ 0.0%vs. prior month
$34.4K
latest month
12-month trend
B01CR9JVF6
Aerostar Air Filter 18x20x1 MERV 11 AC Filter, HVAC, Furnace Filter, 6 Pack | ACTUAL SIZE (17.50 x 19.50 x 0.75) AC Filter, Furnace Filter, Dust, Pet Dander, Smoke & Allergies MERV 11 (MPR 1200)
1K
▲ 0.0%vs. prior month
$39.4K
latest month
12-month trend
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Best 18x18x1 Air Filter Brands on Amazon US — Top 3 Brand Sales Concentration (July 2026)
Filterbuy is the best-performing 18x18x1 air filter brand in July 2026, moving 3,000 units across 2 ASINs for 23.4% of Top 10 volume. Simply follows with 2,800 units (21.9%), ahead of Filtrete on 2,500 units (19.5%).
With 6 brands splitting the Top 10 and 64.8% 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 $38.26 to $43.97, which frames the price band a competing listing has to justify.
Brand share of Top 10 volume
Filterbuy
2 ASINs in Top 10
23.4%
Units
3K
Revenue
$117K
Avg. price
$38.46
B00CJZ8EKW
$41.96·★4.5·3.7K revsFilterbuy 18x24x1 Air Filter MERV 8 Dust & Allergy Defense (4-Pack) | Electrostatic Pleated HVAC AC Furnace Filters Replacement, Made in USA (Actual Size: 17.38 x 23.38 x 0.75)
Units sold2KB00CJZ8CTK
$34.96·★4.7·2.2K revsFilterbuy 18x18x1 Air Filter MERV 8 Dust & Allergy Defense (4-Pack) | Electrostatic Pleated HVAC AC Furnace Filters Replacement, Made in USA (Actual Size: 17.75 x 17.75 x 0.75)
Units sold1K
Simply
2 ASINs in Top 10
21.9%
Units
2.8K
Revenue
$109.3K
Avg. price
$43.97
B09RHMBGVX
$39.97·★4.7·54.3K revsSimply 18x18x1 Air Filter, Merv 8, 6 Pack, For Home AC Furnace & HVAC (Actual Size: 17.75"x17.75"x0.75") DUST, Pet, & Allergy Control
Units sold2KB0849THGYF
$47.97·★4.7·54.3K revsSimply 14x18x1 Air Filter, Merv 8, 6 Pack, For Home AC Furnace & HVAC (Actual Size: 13.75"x17.75"x0.75") DUST, Pet, & Allergy Control
Units sold800
Filtrete
2 ASINs in Top 10
19.5%
Units
2.5K
Revenue
$80.5K
Avg. price
$38.26
B07FQHYTC9
$27.96·★4.7·161K revsFiltrete 18x18x1 Air Filter MERV 5, 6-Pack AC Furnace Filters for Home HVAC, MPR 300
Units sold2KB005GZ8PEC
$48.56·★4.8·25.7K revsFiltrete 18x18x1 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 17.68 x 0.81 in)
Units sold500
Trending 18x18x1 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, B00CJZ5KZE leads positive momentum with ▲ 300.0% MoM growth on 400 units, with B00CJZ8EKW 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.
B00CJZ5KZE
Filterbuy 18x18x1 Air Filter MERV 11 Pet & Allergy Defense (4-Pack) | Electrostatic Pleated HVAC AC Furnace Filters Replacement, Made in USA (Actual Size: 17.75 x 17.75 x 0.75)
Price
$35.96
Rating
4.6
Reviews
517
Latest month sales
B00CJZ8EKW
Filterbuy 18x24x1 Air Filter MERV 8 Dust & Allergy Defense (4-Pack) | Electrostatic Pleated HVAC AC Furnace Filters Replacement, Made in USA (Actual Size: 17.38 x 23.38 x 0.75)
Price
$41.96
Rating
4.5
Reviews
3.7K
Latest month sales
B09XGDZQNG
BNX TruFilter 20x25x1 Air Filter MERV 13 AC Filter, HVAC Furnace Filter, 6 Pack (ACTUAL SIZE 19.68"x24.68"x0.75") Allergies, Dust, Pet Dander & Smoke - MADE IN USA - MPR1500 / FPR 10
Unlock to view ASIN details and product titles
Price
$67.49
Rating
4.7
Reviews
8.1K
Latest month sales
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