---
title: "18x20x1 Air Filter — $1.9M/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/tools-home-improvement/18x20x1-air-filter"
last_updated: "2026-08-08T06:57:16.861Z"
locale: en
meta:
description: "Niche score 63/100 · $1.9M/yr market · 395K searches/yr · $37.96 avg price. Clears our launch bar. Data updated Jul 2026."
"og:description": "Niche score 63/100 · $1.9M/yr market · 395K searches/yr · $37.96 avg price. Clears our launch bar. Data updated Jul 2026."
"og:title": "18x20x1 Air Filter — $1.9M/yr Amazon US Niche (2026) - Flapen"
---
# **18x20x1 air filter**
**Launch it**
A $1.9M/yr market growing +25.9% this quarter with returns at 0.9% — clears our launch bar.
Market size 94Growth 54Conversion 96Competition 35Returns 95Price range 95Avg price 95Brand share 12Review moat 21Quality gap 47
**Conversion**
**Incredible****13.0%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Incredible****0.9%**
return rate — above 5% kills the launch gate
**Avg price**
**Incredible****$37.96**
avg listing price — sweet spot $15–$100
**Price range**
**Incredible****$22.42–$54.91**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Market size**
**Great****$1.9M**
$1.9M/yr · 395K searches
**Growth**
**Good****+25.9%**
90-day search growth — must beat 0% to launch
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Competition**
**Okay****64%**
top-5 click share — leaders hold, buyers still browse
**Review moat**
**Bad****12,271.39**
avg incumbent reviews — the moat a new listing must climb
**Brand share**
**Bad****95%**
top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, 18x20x1 air filter is a $1.9M/yr Amazon United States market (395K searches/yr). The top 5 brands hold 95% of demand. Demand peaks in Jul. Verdict: Launch it — 63/100.
Data updated Jul 27, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **18x20x1 air filter market data**
- **Units sold / yr**
- **50K–60K**
- avg 3,000–4,000/product
- **Revenue / yr**
- **$1.9M–$2.3M**
- units × avg price
- **Conversion rate**
- **13.0%**
- **Avg BSR**
- **#75**
- **Page quality**
- **0%**
- **Prime**
- **67%**
- **Sponsored**
- **89%**
- **Out of stock**
- **0.4%**
- **Avg brand age**
- **49 months**
- **Avg seller age**
- **184 days**
## **Competition & brand share**
The top 5 products take 64% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**9 **▲rising
**Sellers**
**20**
**Top-5 brand share**
**95%**
Top 20: 100%
**Top-5 click share**
**64%**
Top 20: 100%
**Open market**
**4%**
- Filterbuy28% - Aerostar24% - Simply23% - Filtrete18% - Colorfil3% - protectplusair1% - Open — no brand owns it (3 brands, 4%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +25.9% search growth over the last 90 days.
12K8KSpike '25Prime Day '25Spike '26Prime Day '26 seasonSepDecMarJunAugNovMarMay
Peak months: Jul · busiest ÷ quietest = 1.7×
[**Open Trend **](https://flapen.com/research/us/tools-home-improvement/18x20x1-air-filter/trend)
## **Top 18x20x1 air filter search terms**
- **18x20x1 air filter**176K/yr+38.8%11.7% conv. - **air filter 18x20x1**41K/yr+31.2%10.7% conv. - **ac filter 18x20x1**22K/yr+31.5%11.6% conv. - **18x20x1 air filter 6 pack**12K/yr+47.6%17.2% conv. - **18 x 20 x 1 air filters for home**18K/yr+31.5%12.6% conv. - **furnace filters 18x20x1**13K/yr+7.2%7.7% conv. - **18x20x1 furnace filter**23K/yr-35.7%5.4% conv. - **20x18x1 air filter**10K/yr+42.2%10.8% conv. - **18x20x1**10K/yr+23.5%11.2% conv. - **air filters 18x20x1**9K/yr+23.7%12.7% conv. [**All search terms **](https://flapen.com/research/us/tools-home-improvement/18x20x1-air-filter/search-terms)
## **Top 18x20x1 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%5%$97K10%$195K15%$292K20%$389K1101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 18 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Simply 18x20x1 Air Filter MERV 8 6 Pack For Home AC Furnace & HVAC (Actual Size: 17.81x19.81x0.75) DUST Pet & Allergy Control**Simply**$35.50**4.7★53,363 rev](https://www.amazon.com/dp/B07XKB9541) [2**Filterbuy 18x20x1 Air Filter MERV 8 Essential Dust & Allergy Defense (4-Pack) Electrostatic Pleated HVAC AC Furnace Filters Replacement Made in USA (Actual Size: 17.50 x 19.50 x 0.75)**Filterbuy**$33.02**4.7★1,632 rev](https://www.amazon.com/dp/B00CJZ8DIU) [3**Filterbuy 18x20x1 Air Filter MERV 8 Essential Dust & Allergy Defense (6-Pack) Electrostatic Pleated HVAC AC Furnace Filters Replacement Made in USA (Actual Size: 17.50 x 19.50 x 0.75)**Filterbuy**$37.10**4.7★51,098 rev](https://www.amazon.com/dp/B00CK01YCQ) [4**Filtrete 18x20x1 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 19.68 x 0.81 in)**Filtrete**$42.23**4.8★25,454 rev](https://www.amazon.com/dp/B005F5D1JC) [5**Aerostar 18x20x1 MERV 8 Air Filter 6 Count ACTUAL SIZE (17.50 x 19.50 x 0.75) HVAC Air Conditioning & Furnace Filter Captures Dust Lint & Pollen (MPR 600 / FPR 5) Made in USA**Aerostar**$31.44**4.7★8,371 rev](https://www.amazon.com/dp/B01CSWQ8EE)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Clorox 18x20x1 Air Filter MERV 8 with Carbon Reduces Pet Smells Cooking Smells and More Pleated HVAC AC Furnace Filter 4-Pack (Actual Size 17.75 x 19.75 x 0.75) Made in USA**Clorox Air Filters**$42.30**1 rev2mo ago](https://www.amazon.com/dp/B0GZJDMLKQ) [**Filtrete 18x20x1 Air Filter MERV 13 MPR 1900 Allergens Bacteria Viruses & Air Pollutants 3-Month AC/Furnace Filters Cleaner Air Reliable Airflow 2 HVAC Filters(Act Size 17.81x19.81x0.78 in)**Filtrete**$43.58**17,142 rev1y ago](https://www.amazon.com/dp/B0F9LTKG2W) [**Filtrete 18x20x1 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 17.81 x 19.81 x 0.81 in)**Filtrete**$22.42**740 rev1y ago](https://www.amazon.com/dp/B0DKZ428BF) [**BNX TruFilter 18x20x1 Air Filter MERV 13 (6-Pack) - MADE IN USA - Electrostatic Pleated Air Conditioner HVAC AC Furnace Filters for Allergies Pollen Mold Bacteria Smoke Allergen MPR 1900 FPR 10**BNX**$54.91**7,885 rev2y ago](https://www.amazon.com/dp/B0CKWFJCP5) [**Simply 18x20x1 Air Filter Merv 11 6 Pack For Home AC Furnace & HVAC (Actual Size: 17.81x19.81x0.75) DUST Pet & Allergy Control**Simply**$37.10**6,555 rev3y ago](https://www.amazon.com/dp/B0BWSCH1B1)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Clorox 18x20x1 Air Filter MERV 8 with Carbon Reduces Pet Smells Cooking Smells and More Pleated HVAC AC Furnace Filter 4-Pack (Actual Size 17.75 x 19.75 x 0.75) Made in USA**Clorox Air Filters**$42.30**1.0★**▲ 248%**](https://www.amazon.com/dp/B0GZJDMLKQ) [**Aerostar 18x20x1 MERV 8 - 4 Count - High Efficiency Pleated HVAC Furnace & Air Conditioner Filters - Removes Dust Lint Mold & Allergy-Causing Pollen**Aerostar**$30.54**4.7★**▲ 177%**](https://www.amazon.com/dp/B0813SLHFR) [**Simply 18x20x1 Air Filter Merv 8 4 Pack For Home AC Furnace & HVAC (Actual Size: 17.81x19.81x0.75) DUST Pet & Allergy Control**Simply**$28.71**4.6★**▲ 140%**](https://www.amazon.com/dp/B0BW13WX9Y) [**Filterbuy 18x20x1 Air Filter MERV 11 Superior Pet & Allergy Defense (4-Pack) Electrostatic Pleated HVAC AC Furnace Filters Replacement Made in USA (Actual Size: 17.50 x 19.50 x 0.75)**Filterbuy**$37.10**4.6★**▲ 73%**](https://www.amazon.com/dp/B00CJZ5LI0) [**Simply 18x20x1 Air Filter Merv 11 6 Pack For Home AC Furnace & HVAC (Actual Size: 17.81x19.81x0.75) DUST Pet & Allergy Control**Simply**$37.10**4.6★**▲ 43%**](https://www.amazon.com/dp/B0BWSCH1B1)
**~~View all trending →~~**
## **What buyers say about 18x20x1 air filter**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Filtration**23%
*“Great filters for the price”*
**Quality-Overall**16%
*“Well constructed”*
**Size-Overall**16%
*“Fit was accurate”*
**Value For Money**16%
*“Great value”*
**Advertised Vs Actual Product**8%
*“Does job”*
**Efficiency**4%
*“Works well”*
**Durability**2%
*“Works great, last about 3 months”*
**Assembly/Installation**2%
*“Easy to install”*
**Strength**1%
*“They are sturdy”*
**Ease Of Use**1%
*“easy to use”*
### **What buyers complain about **
**Size-Overall**24%
*“not standard size”*
**Filtration**10%
*“I bought some more expensive carbon filters”*
**Noise Level**9%
*“It whistled loudly”*
**Durability**7%
*“dont last long”*
**Value For Money**4%
*“My only complaint is that the price seems to consistently increase”*
**Quality-Overall**3%
*“Theyre not as goodly made as they say”*
**Advertised Vs Actual Product**3%
*“Please fix your advertisement”*
**Design-Overall**2%
*“No structural integrity, cheaply built”*
**Ease Of Cleaning**2%
*“it doesn't get rid of dust, particles”*
**Smell**2%
*“you can't smell it in the home”*
### **Top return reasons **
**Size-Overall**82%
**Filtration**10%
**Compatibility-Overall**4%
**Value For Money**2%
**Advertised Vs Actual Product**1%
**Certifications**1%
**Thickness**0%
**Water Resistance**0%
**Functionality-Overall**0%
**Defective Material/Parts**0%
## **Common questions**
- **Is 18x20x1 air filter profitable to sell on Amazon United States?**
- The niche generates $1.9M/yr across 18 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is +25.9%. Flapen's verdict: Launch it (63/100).
- **How competitive is the 18x20x1 air filter niche?**
- 9 brands and 20 sellers compete. The top 5 products take 64% of clicks and top 5 brands hold 95% of demand.
- **What do buyers complain about in 18x20x1 air filter?**
- Top complaints mined from reviews: Size-Overall, Filtration, Noise Level. The return rate is 0.9%.
- **When does demand for 18x20x1 air filter peak?**
- Demand peaks in Jul; the busiest month runs 1.7× the quietest.
- **What does it cost to enter the 18x20x1 air filter niche?**
- Listings span $22.42–$54.91; the average listing price is $37.96 (sweet spot $15–$100). The average incumbent carries 12,271 reviews — the moat a new listing must climb.
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