---
title: "21x22x1 Air Filter — $40K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/tools-home-improvement/21x22x1-air-filter"
last_updated: "2026-08-08T06:57:57.029Z"
locale: en
meta:
description: "Niche score 41/100 · $40K/yr market · 23K searches/yr · $52.96 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 41/100 · $40K/yr market · 23K searches/yr · $52.96 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "21x22x1 Air Filter — $40K/yr Amazon US Niche (2026) - Flapen"
---
# **21x22x1 air filter**
**Skip it**
Brand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.
Market size 10Growth 77Conversion 40Competition 15Returns 96Price range 95Avg price 92Brand share 0Review moat 16Quality gap 21
**Returns**
**Incredible****0.8%**
return rate — above 5% kills the launch gate
**Price range**
**Incredible****$39.11–$71.23**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Avg price**
**Great****$52.96**
avg listing price — sweet spot $15–$100
**Growth**
**Great****+65.5%**
90-day search growth — must beat 0% to launch
**Conversion**
**Okay****3.2%**
search→purchase rate — share of searches ending in a sale
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Review moat**
**Bad****20,867.18**
avg incumbent reviews — the moat a new listing must climb
**Competition**
**Bad****82%**
top-5 click share — a locked-up shelf
**Market size**
**Bad****$40K**
$40K/yr · 23K searches
**Brand share**
**Bad****100%**
top-5 brand share — brand-locked demand
**Signals**[** High Price**](https://flapen.com/research/niches?market=us&signal=high_price "Avg price > $50")
According to Flapen's Amazon United States niche tracking, 21x22x1 air filter is a $40K/yr Amazon United States market (23K searches/yr). The top 5 brands hold 100% of demand. Verdict: Skip it — 41/100.
Data updated Jul 27, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **21x22x1 air filter market data**
- **Units sold / yr**
- **1K–2K**
- avg 100–250/product
- **Revenue / yr**
- **$66K–$79K**
- units × avg price
- **Conversion rate**
- **3.2%**
- **Avg BSR**
- **#173**
- **Page quality**
- **0%**
- **Prime**
- **27%**
- **Sponsored**
- **91%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **83 months**
- **Avg seller age**
- **242 days**
## **Competition & brand share**
The top 5 products capture 82% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**4 **▼falling
**Sellers**
**8**
**Top-5 brand share**
**100%**
Top 20: 100%
**Top-5 click share**
**82%**
Top 20: 100%
**Open market**
**0%**
- Filterbuy50% - Filtrete31% - Filter King14% - Simply5%
## **Top 21x22x1 air filter search terms**
- **21x22x1 air filter**11K/yr+53.7%7.6% conv. - **air filter 21x22x1**6K/yr+58.3%3.9% conv. - **21x22x1 furnace filter**3K/yr+104.9%0.4% conv. - **furnace filters 21x22x1**3K/yr+85.4%0.2% conv. [**All search terms **](https://flapen.com/research/us/tools-home-improvement/21x22x1-air-filter/search-terms)
## **Top 21x22x1 air filter 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.
0%10%$4K20%$8K30%$12K40%$16K1101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 11 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Filtrete 21x22x1 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 20.69 x 21.69 x 0.81 in)**Filtrete**$58.92**4.6★627 rev](https://www.amazon.com/dp/B0F9LV4HMC) [2**Filterbuy 21x22x1 Air Filter MERV 8 Essential Dust & Allergy Defense (4-Pack) Electrostatic Pleated HVAC AC Furnace Filters Replacement Made in USA (Actual Size: 20.50 x 21.50 x 0.75)**Filterbuy**$57.23**4.7★671 rev](https://www.amazon.com/dp/B00CJZ8UHO) [3**Filterbuy 21x22x1 Air Filter MERV 8 Essential Dust & Allergy Defense (6-Pack) Electrostatic Pleated HVAC AC Furnace Filters Replacement Made in USA (Actual Size: 20.50 x 21.50 x 0.75)**Filterbuy**$67.13**4.7★51,098 rev](https://www.amazon.com/dp/B00CK02BMS) [4**Filterbuy 21x22x1 Air Filter MERV 8 Essential Dust & Allergy Defense (2-Pack) Electrostatic Pleated HVAC AC Furnace Filters Replacement Made in USA (Actual Size: 20.50 x 21.50 x 0.75)**Filterbuy**$39.11**4.6★68,921 rev](https://www.amazon.com/dp/B00CK060PM) [5**Filter King 21x22x1 Air Filter (MERV 8) (6-Pack) Dust & Allergy Control AC Furnace Filters MADE IN USA HVAC Pleated Electrostatic (Actual Size: 20.5 x 21.5 x .75)**Filter King**$63.00**4.7★2,030 rev](https://www.amazon.com/dp/B07HFF55RB)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Filtrete 21x22x1 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 20.69 x 21.69 x 0.81 in)**Filtrete**$58.92**627 rev1y ago](https://www.amazon.com/dp/B0F9LV4HMC) [**Simply 20x22x1 Air Filter Merv 8 6 Pack For Home AC Furnace & HVAC (Actual Size: 19.75x21.75x0.75) DUST Pet & Allergy Control**Simply**$42.31**53,363 rev4y ago](https://www.amazon.com/dp/B09RHLPY1Q) [**Simply 21x22x1 Air Filter Merv 8 4 Pack For Home AC Furnace & HVAC (Actual Size: 20.75x21.75x0.75) DUST Pet & Allergy Control**Simply**$45.25**5,182 rev4y ago](https://www.amazon.com/dp/B09R4Z2GMX) [**Filter King 21x22x1 Air Filter (MERV 8) (2-Pack) Dust & Allergy Control AC Furnace Filters MADE IN USA HVAC Pleated Electrostatic (Actual Size: 20.5 x 21.5 x .75)**Filter King**$40.05**6 rev7y ago](https://www.amazon.com/dp/B07T32K8NX) [**Filter King 21x22x1 Air Filter (MERV 8) (6-Pack) Dust & Allergy Control AC Furnace Filters MADE IN USA HVAC Pleated Electrostatic (Actual Size: 20.5 x 21.5 x .75)**Filter King**$63.00**2,030 rev7y ago](https://www.amazon.com/dp/B07HFF55RB)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Simply 21x22x1 Air Filter Merv 8 4 Pack For Home AC Furnace & HVAC (Actual Size: 20.75x21.75x0.75) DUST Pet & Allergy Control**Simply**$45.25**4.6★**▲ 253%**](https://www.amazon.com/dp/B09R4Z2GMX) [**Filter King 21x22x1 Air Filter (MERV 8) (4-Pack) Dust & Allergy Control AC Furnace Filters MADE IN USA HVAC Pleated Electrostatic (Actual Size: 20.5 x 21.5 x .75)**Filter King**$53.96**4.6★**▲ 176%**](https://www.amazon.com/dp/B07FQZHT24) [**Filter King 21x22x1 Air Filter (MERV 8) (2-Pack) Dust & Allergy Control AC Furnace Filters MADE IN USA HVAC Pleated Electrostatic (Actual Size: 20.5 x 21.5 x .75)**Filter King**$40.05**5.0★**▲ 148%**](https://www.amazon.com/dp/B07T32K8NX) [**Filtrete 21x22x1 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 20.69 x 21.69 x 0.81 in)**Filtrete**$58.92**4.6★**▲ 29%**](https://www.amazon.com/dp/B0F9LV4HMC) [**Filterbuy 21x22x1 Air Filter MERV 8 Essential Dust & Allergy Defense (4-Pack) Electrostatic Pleated HVAC AC Furnace Filters Replacement Made in USA (Actual Size: 20.50 x 21.50 x 0.75)**Filterbuy**$57.23**4.7★**— 1%**](https://www.amazon.com/dp/B00CJZ8UHO)
**~~View all trending →~~**
## **What buyers say about 21x22x1 air filter**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Filtration**42%
*“We've purchased filters from Filterbuy for 11 years”*
**Quality-Overall**17%
*“have been pleased with the quality”*
**Value For Money**17%
*“Excellent quality/big price jump”*
### **What buyers complain about **
**Size-Overall**33%
*“Actual Size: 19.50 x 21.50 x 0.75 that 1/4 inch difference is too High”*
**Quality-Overall**33%
*“Poor quality”*
**Value For Money**17%
*“the price just keeps going up”*
### **Top return reasons **
**Size-Overall**78%
**Compatibility-Overall**9%
**Filtration**8%
**Defective Material/Parts**1%
**Assembly/Installation**1%
**Height**1%
**Value For Money**1%
**Adhesion/Stickiness**0%
**Advertised Vs Actual Product**0%
**Strength**0%
## **Common questions**
- **Is 21x22x1 air filter profitable to sell on Amazon United States?**
- The niche generates $40K/yr across 11 tracked products. 90-day search growth is +65.5%. Flapen's verdict: Skip it (41/100).
- **How competitive is the 21x22x1 air filter niche?**
- 4 brands and 8 sellers compete. The top 5 products take 82% of clicks and top 5 brands hold 100% of demand.
- **What do buyers complain about in 21x22x1 air filter?**
- Top complaints mined from reviews: Size-Overall, Quality-Overall, Value For Money. The return rate is 0.8%.
- **What does it cost to enter the 21x22x1 air filter niche?**
- Listings span $39.11–$71.23; the average listing price is $52.96 (sweet spot $15–$100). The average incumbent carries 20,867 reviews — the moat a new listing must climb.
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