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16 3/8 X 21 1/2 X1 Air Filter

Maybe

Buyers convert on 15.2% of searches. But the top 5 brands take 94% of clicks, so 16 3/8 X 21 1/2 X1 Air Filter is a Maybe.

Flapen Score
54
54 / 100
Top 24% of 9,536 Tools & Home Improvement niches · +6 vs the category median of 48
Market size
$302K/yr42K searches / yr
90-day growth
+39.8%search demand this quarter
Competition
70%top-5 click share · 8 brands · 13 sellers

Flapen Score

16 3/8 X 21 1/2 X1 Air Filter against its category

The dotted line is the Tools & Home Improvement average. Past it, 16 3/8 X 21 1/2 X1 Air Filter is stronger. Inside it, weaker.

54Maybe
Big MarketTrendingHigh ConversionOpen MarketLow ReturnsPrice rangeAvg priceNo Dominant BrandLow Review BarrierQuality Gap
This niche Category average

Market

The 16 3/8 X 21 1/2 X1 Air Filter market on Amazon at a glance

Shoppers on Amazon United States searched for 16 3/8 X 21 1/2 X1 Air Filter 42K times last year and spent an estimated $302K. The top 5 brands take 94% of clicks. Demand peaks in Jun–Jul–Aug. Flapen scores it 54 out of 100, a Maybe.

01 · Demand

An estimated 15.2% of those searches ended in a purchase.

Shoppers searched for this 42K times in the last 12 months. That counts every search on Amazon United States for this niche's terms. An estimated 15.2% of those searches ended in a purchase. Searches in the last 90 days moved +39.8% against the 90 days before. Searches, conversion and average price together put the market at an estimated $302K a year.

Searches, last 12 months
42K
Growth, 90 days vs prior 90
+39.8%
Conversion, latest week
15.2%
Market size, estimated
$302Ka year
Peak month
July2.5× the quietest month
Top search term
16 3/8 x 21 1/2 x 1 air filter28K searches a year

02 · Price

A sale here is worth $47.80.

Listings sell for $47.80 on average, from $32.71 to $63.36. Amazon reports units sold in ranges. This niche sold 6K to 8K a year. The average listing sells 250 to 500 of them. At $47.80 that is $12K to $24K a year per listing.

Average price
$47.80inside the $15 to $100 sweet spot
Price range
$32.71–$63.36
Amazon United States median price
$24.38across 115,062 niches
Units sold a year
6K–8K
Units per listing a year
250–500
Revenue per listing a year
$12K–$24K
Returns
1.6%of orders · Amazon United States median 2.1%

03 · Entry bar

The bar here is reviews.

80% of listings pay for placement with sponsored ads. 73% ship with Prime. On an average day, 9.6% of listings are out of stock. The average listing ranks #229 within Furnace Parts & Accessories. It carries 2,015 reviews at 4.68 stars, so a new listing needs social proof before a better product.

Sponsored listings
80%
Prime listings
73%
Out of stock, average day
9.6%
Average rank
#229in Furnace Parts & Accessories
Average rating
4.68 starsAmazon United States average 4.42 stars
Average reviews
2,015per listing
Listings tracked
15

04 · Newcomers

0 of last year's 1 launches cleared the first-year sales bar.

1 products launched here in the last 12 months. 0 of them cleared the first-year sales bar, our mark for a successful launch. The brands on the shelf have sold for 62 months on average, so the names here are established.

Launched, last 12 months
1
Successful launches
0Amazon's first-year sales bar
Average brand age
62 months

Products

Top 16 3/8 X 21 1/2 X1 Air Filter products & what they sell for

The products selling here, as shoppers see them on Amazon. Shelf share and sales are our estimates.

Prices and ratings read from Amazon on Jul 27, 2026. The live listing can differ.

Competition

Competition: brands, sellers & click share

The top 5 products take an estimated 70% of clicks. A locked shelf that new listings rarely crack.

$0$30K$60K$91K$121K101001K10K Review Count Sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

Brands

8 rising

Sellers

13

Est. top-5 brand share

94%

Top 20: 100%

Est. top-5 click share

70%

Top 20: 100%

Open market

4%

  • Aerostar63%
  • Chenzhit12%
  • Glasfloss12%
  • Qingzhug4%
  • Fxnitang2%
  • Filtrete2%
  • Open — no brand owns it (2 brands, 4%)

Demand

16 3/8 X 21 1/2 X1 Air Filter search demand

Weekly searches over the year, seasonality beneath. Pick a range.

2K1KSpike '25Prime Day '25Spike '26Prime Day '26DecMarJunAugNovMarMay

Peak months: Jun, Jul, Aug · busiest ÷ quietest = 2.5×

Search terms

Top 16 3/8 X 21 1/2 X1 Air Filter search terms shoppers use

The exact words shoppers type, with estimated yearly volume, growth, and conversion.

  • 16 3/8 x 21 1/2 x 1 air filter28K/yr
  • air filter 16 3/8 x 21 1/2 x 15K/yr
  • ac filter 16 3/8 x 21 1/2 x14K/yr
  • aerostar 16 3/8 x 21 1/2 x 13K/yr
  • 16 3/8 x 21 1/2 x1 air filter1K/yr
  • air filter 16 3/8 x 21 1/2 x1637/yr
  • 16 3/8 x21 1/2 x1 air filters22/yr

Reviews and returns

What reviews say buyers love and hate about 16 3/8 X 21 1/2 X1 Air Filter

We read the reviews and the return reasons for every product selling here.

29%of positive reviews mention “Quality-Overall”
19%of negative reviews mention “Size-Overall”
1.6%of orders come back
“Was given the wrong size”
A buyer, on “Size-Overall”19% of negative reviews mention the same topic

Every topic

Every topic buyers talk about, one row each.

Red shows the share of negative reviews and green the share of positive reviews, biggest topic first. Open a row to read what they wrote.

16 topics

NegativePositive

FAQ

Common 16 3/8 X 21 1/2 X1 Air Filter questions

Answered from the same tracked data.

Figures on this page are estimates modeled from public Amazon pages and third-party keyword data. Amazon does not supply them, and no connected seller's data is used. How we handle Amazon data