---
title: "17x21x1 Air Filter — $65K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/tools-home-improvement/17x21x1-air-filter"
last_updated: "2026-08-08T16:37:02.410Z"
locale: en
meta:
description: "Niche score 44/100 · $65K/yr market · 13K searches/yr · $42.82 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 44/100 · $65K/yr market · 13K searches/yr · $42.82 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "17x21x1 Air Filter — $65K/yr Amazon US Niche (2026) - Flapen"
---
# **17x21x1 air filter**
**Skip it**
Brand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.
Market size 16Growth 65Conversion 95Competition 2Returns 81Price range 95Avg price 95Brand share 0Review moat 43Quality gap 22
**Conversion**
**Incredible****12.0%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Incredible****$42.82**
avg listing price — sweet spot $15–$100
**Price range**
**Incredible****$31.88–$59.92**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Returns**
**Great****1.7%**
return rate — above 5% kills the launch gate
**Growth**
**Good****+44.3%**
90-day search growth — must beat 0% to launch
**Review moat**
**Okay****2,195.33**
avg incumbent reviews — the moat a new listing must climb
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Market size**
**Bad****$65K**
$65K/yr · 13K searches
**Competition**
**Bad****98%**
top-5 click share — a locked-up shelf
**Brand share**
**Bad****100%**
top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, 17x21x1 air filter is a $65K/yr Amazon United States market (13K searches/yr). The top 5 brands hold 100% of demand. Demand peaks in Jul–Aug. Verdict: Skip it — 44/100.
Data updated Jul 27, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **17x21x1 air filter market data**
- **Units sold / yr**
- **2K–2K**
- avg 100–250/product
- **Revenue / yr**
- **$64K–$86K**
- units × avg price
- **Conversion rate**
- **12.0%**
- **Avg BSR**
- **#327**
- **Page quality**
- **0%**
- **Prime**
- **33%**
- **Sponsored**
- **83%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **55 months**
- **Avg seller age**
- **213 days**
## **Competition & brand share**
The top 5 products capture 98% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**3 **—flat
**Sellers**
**7**
**Top-5 brand share**
**100%**
Top 20: 100%
**Top-5 click share**
**98%**
Top 20: 100%
**Open market**
**0%**
- Filter King57% - Filtrete38% - Aerostar4%
## **Demand & seasonality**
Weekly Amazon search volume, last 102 weeks — +44.3% search growth over the last 90 days.
400300Spike '24Spike '25Prime Day '25Spike '26 seasonDecMarJunAugNovMarMay
Peak months: Jul, Aug · busiest ÷ quietest = 1.7×
[**Open Trend **](https://flapen.com/research/us/tools-home-improvement/17x21x1-air-filter/trend)
## **Top 17x21x1 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%15%$10K30%$20K45%$29K60%$39K101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 6 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Filter King 17x21x1 Air Filter (MERV 8) (4-Pack) Dust & Allergy Control AC Furnace Filters MADE IN USA HVAC Pleated Electrostatic (Actual Size: 17 x 21 x .75)**Filter King**$38.63**4.7★1,569 rev](https://www.amazon.com/dp/B07FR2HT4B) [2**Filtrete 17x21x1 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 16.69 x 20.69 x 0.81 in)**Filtrete**$42.30**4.7★6,265 rev](https://www.amazon.com/dp/B0CZC54GBV) [3**Filter King 17x21x1 Air Filter (MERV 8) (2-Pack) Dust & Allergy Control AC Furnace Filters MADE IN USA HVAC Pleated Electrostatic (Actual Size: 17 x 21 x .75)**Filter King**$31.88**4.5★181 rev](https://www.amazon.com/dp/B07T4468JT) [4**Filter King 17x21x1 Air Filter (MERV 8) (6-Pack) Dust & Allergy Control AC Furnace Filters MADE IN USA HVAC Pleated Electrostatic (Actual Size: 17 x 21 x .75)**Filter King**$59.92**4.6★90 rev](https://www.amazon.com/dp/B07HFH375V) [5**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**$33.33**4.7★4,106 rev](https://www.amazon.com/dp/B0813SW6FK)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Filtrete 17x21x1 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 16.69 x 20.69 x 0.81 in)**Filtrete**$42.30**6,265 rev2y ago](https://www.amazon.com/dp/B0CZC54GBV) [**Filter King 17x21x1 Air Filter (MERV 8) (5-Pack) Dust & Allergy Control AC Furnace Filters MADE IN USA HVAC Pleated Electrostatic (Actual Size: 17 x 21 x .75)**Filter King**$50.87**961 rev3y ago](https://www.amazon.com/dp/B0BY3JH58B) [**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**$33.33**4,106 rev6y ago](https://www.amazon.com/dp/B0813SW6FK) [**Filter King 17x21x1 Air Filter (MERV 8) (2-Pack) Dust & Allergy Control AC Furnace Filters MADE IN USA HVAC Pleated Electrostatic (Actual Size: 17 x 21 x .75)**Filter King**$31.88**181 rev7y ago](https://www.amazon.com/dp/B07T4468JT) [**Filter King 17x21x1 Air Filter (MERV 8) (6-Pack) Dust & Allergy Control AC Furnace Filters MADE IN USA HVAC Pleated Electrostatic (Actual Size: 17 x 21 x .75)**Filter King**$59.92**90 rev7y ago](https://www.amazon.com/dp/B07HFH375V)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Filter King 17x21x1 Air Filter (MERV 8) (6-Pack) Dust & Allergy Control AC Furnace Filters MADE IN USA HVAC Pleated Electrostatic (Actual Size: 17 x 21 x .75)**Filter King**$59.92**4.6★**▲ 56%**](https://www.amazon.com/dp/B07HFH375V) [**Filtrete 17x21x1 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 16.69 x 20.69 x 0.81 in)**Filtrete**$42.30**4.7★**— 8%**](https://www.amazon.com/dp/B0CZC54GBV) [**Filter King 17x21x1 Air Filter (MERV 8) (2-Pack) Dust & Allergy Control AC Furnace Filters MADE IN USA HVAC Pleated Electrostatic (Actual Size: 17 x 21 x .75)**Filter King**$31.88**4.5★**— 4%**](https://www.amazon.com/dp/B07T4468JT) [**Filter King 17x21x1 Air Filter (MERV 8) (4-Pack) Dust & Allergy Control AC Furnace Filters MADE IN USA HVAC Pleated Electrostatic (Actual Size: 17 x 21 x .75)**Filter King**$38.63**4.7★**— 4%**](https://www.amazon.com/dp/B07FR2HT4B) [**Filter King 17x21x1 Air Filter (MERV 8) (5-Pack) Dust & Allergy Control AC Furnace Filters MADE IN USA HVAC Pleated Electrostatic (Actual Size: 17 x 21 x .75)**Filter King**$50.87**4.7★**▼ 24%**](https://www.amazon.com/dp/B0BY3JH58B)
**~~View all trending →~~**
## **What buyers say about 17x21x1 air filter**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Quality-Overall**44%
*“Good product”*
**Filtration**19%
*“Really good filters”*
**Size-Overall**19%
*“Fit well”*
**Value For Money**6%
*“Perfect and Great price”*
**Ease Of Use**6%
*“Easy to use”*
**Storage Capacity**6%
*“love having a bulk supply”*
### **What buyers complain about **
**Filtration**33%
*“This filter is incredibly cheap and flimsy”*
**Quality-Overall**33%
*“Cheap and defective”*
**Design-Overall**33%
*“Definite design flaw”*
### **Top return reasons **
**Size-Overall**73%
**Filtration**14%
**Compatibility-Overall**6%
**Defective Material/Parts**2%
**Value For Money**1%
**Functionality-Overall**1%
**Advertised Vs Actual Product**1%
**Thickness**0%
**Flexibility**0%
**Color**0%
## **Common questions**
- **Is 17x21x1 air filter profitable to sell on Amazon United States?**
- The niche generates $65K/yr across 6 tracked products. 90-day search growth is +44.3%. Flapen's verdict: Skip it (44/100).
- **How competitive is the 17x21x1 air filter niche?**
- 3 brands and 7 sellers compete. The top 5 products take 98% of clicks and top 5 brands hold 100% of demand.
- **What do buyers complain about in 17x21x1 air filter?**
- Top complaints mined from reviews: Filtration, Quality-Overall, Design-Overall. The return rate is 1.7%.
- **When does demand for 17x21x1 air filter peak?**
- Demand peaks in Jul–Aug; the busiest month runs 1.7× the quietest.
- **What does it cost to enter the 17x21x1 air filter niche?**
- Listings span $31.88–$59.92; the average listing price is $42.82 (sweet spot $15–$100). The average incumbent carries 2,195 reviews — the moat a new listing must climb.
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