16x21x1 air filters
Worth a lookShows a sweet-spot price point ($44.79 avg), but a failed launch gate (market size, growth, or returns) keeps it on the watch list.
Avg price
Incredible$44.79avg listing price — sweet spot $15–$100
Price range
Incredible$25.59–$63.36cheapest to priciest tracked listing — scored on the share inside $15–$100
Returns
Great1.3%return rate — above 5% kills the launch gate
Conversion
Great10.3%search→purchase rate — share of searches ending in a sale
Growth
Good+41.8%90-day search growth — must beat 0% to launch
Market size
Good$361K$361K/yr · 78K searches
Competition
Okay58%top-5 click share — leaders hold, buyers still browse
Brand share
Okay88%top-5 brand share — brands hold most of the demand
Review moat
Bad6,282.52avg incumbent reviews — the moat a new listing must climb
Quality gap
Bad4.7★avg incumbent rating — lower means beatable quality
According to Flapen's Amazon United States niche tracking, 16x21x1 air filters is a $361K/yr Amazon United States market (78K searches/yr). The top 5 brands hold 88% of demand. Demand peaks in Jul. Verdict: Worth a look — 58/100.
Data updated Jul 27, 2026 · scored weekly · How we score niches
16x21x1 air filters market data
- Units sold / yr
- 8K–10K
- avg 500–750/product
- Revenue / yr
- $358K–$448K
- units × avg price
- Conversion rate
- 10.3%
- Avg BSR
- #171
- Page quality
- 0%
- Prime
- 76%
- Sponsored
- 71%
- Out of stock
- 5.7%
- Avg brand age
- 63 months
- Avg seller age
- 193 days
Competition & brand share
The top 5 products take 58% of clicks — established leaders, but buyers still shop beyond them.Brands
11 rising
Sellers
17
Top-5 brand share
88%
Top 20: 100%
Top-5 click share
58%
Top 20: 99%
Open market
9%
- Aerostar53%
- Filtrete13%
- Chenzhit10%
- Glasfloss9%
- Amazon Basics4%
- Qingzhug3%
- Open — no brand owns it (5 brands, 9%)
Demand & seasonality
Weekly Amazon search volume, last 103 weeks — +41.8% search growth over the last 90 days.Peak months: Jul · busiest ÷ quietest = 8.5×
Top 16x21x1 air filters search terms
- 16 3/8 x 21 1/2 x 1 air filter28K/yr
- 16x21x1 air filters14K/yr
- 16x21x1 air filter7K/yr
- air filter 16x21x16K/yr
- 16x21x1 furnace filter6K/yr
- furnace filters 16x21x14K/yr
- air filter 16 3/8 x 21 1/2 x 15K/yr
- ac filter 16 3/8 x 21 1/2 x14K/yr
- 16 x 21 x 1 air filter3K/yr
- aerostar 16 3/8 x 21 1/2 x 13K/yr
Top 16x21x1 air filters products on Amazon
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 21 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Aerostar 16.375x21.5x1 MERV 11 Air Filter 4 Count ACTUAL SIZE (16.50 x 21.50 x 0.75) HVAC Air Conditioning & Furnace Filter for Dust Pet Dander Smoke & Allergies (MPR 1200 / FPR 7) Made in USA
Aerostar$33.334.7★4,106 rev
Aerostar 16.375x21.5x1 MERV 8 Air Filter 6 Count ACTUAL SIZE (16.50 x 21.50 x 0.75) HVAC Air Conditioning & Furnace Filter Captures Dust Lint & Pollen (MPR 600 / FPR 5) Made in USA
Aerostar$45.884.6★3,658 rev
Chenzhit (6 Pack) 16 3/8x21 1/2x1 Furnace Air Filters MPR 1900 & FPR 10 MERV 13 Pleated Air Filter (Actual Size: 16 3/8x21 1/2x3/4)
Chenzhit$58.614.7★647 rev
Glasfloss 16-3/8x21-1/2x1 MERV 10 Air Filters 6-Pack Fits Carrier
Glasfloss$60.304.8★2,728 rev
Aerostar 16.375x21.5x1 MERV 11 - 6 Count - Pleated HVAC Furnace & Air Conditioner Filters - Removes Dust Cold & Flu Germs Lint Mold Pet Dander Allergy-Causing Pollen Smog & Smoke
Aerostar$48.214.7★4,106 rev
Newest
by launch date
(6 Pack) 16 3/8x21 1/2x1 Air Filter MERV 13 MPR 1900 & FPR 10 Pleated Air Filter (Actual Size: 16 3/8x21 1/2x0.75)
Fxnitang$56.2154 rev
Filtrete 16x21x1 AC Furnace Air Filter MPR 700 MERV 8 Tough on Pollen Easy on Airflow 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter 2-Pack (Actual Size 15.69 x 20.69 x 0.81 in)
Filtrete$25.59740 rev
Filtrete 16x21x1 Air Filter MERV 11 MPR 1000 Allergens & Pet Dander 3-Month AC and Furnace Filters Cleaner Air Reliable Airflow 4 HVAC Filters (Actual Size 15.68 x 20.68 x 0.81 in)
Filtrete$53.9825,454 rev
Chenzhit (6 Pack) 16 3/8x21 1/2x1 Furnace Air Filters MPR 1900 & FPR 10 MERV 13 Pleated Air Filter (Actual Size: 16 3/8x21 1/2x3/4)
Chenzhit$58.61647 rev
Filtrete 16x21x1 AC Furnace Air Filter MPR 700 MERV 8 Tough on Pollen Easy on Airflow 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter 6-Pack (Actual Size 15.69 x 20.69 x 0.81 in)
Filtrete$42.93627 rev
Trending
90-day click momentum(6 Pack) 16 3/8x21 1/2x1 Air Filter MERV 13 MPR 1900 & FPR 10 Pleated Air Filter (Actual Size: 16 3/8x21 1/2x0.75)
Fxnitang$56.214.7★
Aerostar 16.375x21.5x1 MERV 8 Air Filter 6 Count ACTUAL SIZE (16.50 x 21.50 x 0.75) HVAC Air Conditioning & Furnace Filter Captures Dust Lint & Pollen (MPR 600 / FPR 5) Made in USA
Aerostar$45.884.6★
Glasfloss 16-3/8x21-1/2x1 MERV 10 Air Filters 6-Pack Fits Carrier
Glasfloss$60.304.8★
16 3/8 x 21 1/2 x 1 Air Filter Frame with High Air Flow Washable Reusable Media Compatible Replacement for Fan Coil Filter KFAFK0212MED 317659-402 -MERV 5 Made in USA AC HVAC Furnace Filter Holder
CoreCarbon$63.364.9★
Filtrete 16x21x1 AC Furnace Air Filter MPR 700 MERV 8 Tough on Pollen Easy on Airflow 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter 2-Pack (Actual Size 15.69 x 20.69 x 0.81 in)
Filtrete$25.594.7★
What buyers say about 16x21x1 air filters
What buyers praise and complain about, mined from review topics.What buyers love
“Best value”
“Fits and reasonable”
“Good filters”
“Good quality”
“As advertised”
“Basic does the job”
“Easy to use”
“Easy to install good air flow”
“Compatibility just as good as comparable name brands and the size and fit is perfect”
“Clean air”
What buyers complain about
“Too big”
“Terrible air filter”
“Poor Quality Control”
“Very flimsy”
“Good price item did not arrive until 3 days later”
“Within a couple weeks theyre broken”
“know that the filters that are the thickest are not the best for your furnace”
“It doesnt make the job”
“Didnt like the filters easily bends”
“No glue around edges”
Top return reasons
Common questions
- Is 16x21x1 air filters profitable to sell on Amazon United States?
- The niche generates $361K/yr across 21 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is +41.8%. Flapen's verdict: Worth a look (58/100).
- How competitive is the 16x21x1 air filters niche?
- 11 brands and 17 sellers compete. The top 5 products take 58% of clicks and top 5 brands hold 88% of demand.
- What do buyers complain about in 16x21x1 air filters?
- Top complaints mined from reviews: Size-Overall, Filtration, Quality-Overall. The return rate is 1.3%.
- When does demand for 16x21x1 air filters peak?
- Demand peaks in Jul; the busiest month runs 8.5× the quietest.
- What does it cost to enter the 16x21x1 air filters niche?
- Listings span $25.59–$63.36; the average listing price is $44.79 (sweet spot $15–$100). The average incumbent carries 6,283 reviews — the moat a new listing must climb.