---
title: "16x20x4 Air Filter — $1.1M/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/tools-home-improvement/16x20x4-air-filter"
last_updated: "2026-08-07T12:41:11.632Z"
locale: en
meta:
description: "Niche score 61/100 · $1.1M/yr market · 165K searches/yr · $58.49 avg price. Clears our launch bar. Data updated Jul 2026."
"og:description": "Niche score 61/100 · $1.1M/yr market · 165K searches/yr · $58.49 avg price. Clears our launch bar. Data updated Jul 2026."
"og:title": "16x20x4 Air Filter — $1.1M/yr Amazon US Niche (2026) - Flapen"
---
# **16x20x4 air filter**
**Launch it**
A $1.1M/yr market growing +18.9% this quarter with returns at 1.1% — clears our launch bar.
Market size 80Growth 49Conversion 94Competition 41Returns 92Price range 81Avg price 90Brand share 31Review moat 22Quality gap 38
**Conversion**
**Great****11.9%**
search→purchase rate — share of searches ending in a sale
**Returns**
**Great****1.1%**
return rate — above 5% kills the launch gate
**Avg price**
**Great****$58.49**
avg listing price — sweet spot $15–$100
**Price range**
**Great****$18.85–$117.85**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Market size**
**Great****$1.1M**
$1.1M/yr · 165K searches
**Growth**
**Okay****+18.9%**
90-day search growth — must beat 0% to launch
**Competition**
**Okay****61%**
top-5 click share — leaders hold, buyers still browse
**Quality gap**
**Okay****4.5★**
avg incumbent rating — lower means beatable quality
**Brand share**
**Okay****86%**
top-5 brand share — brands hold most of the demand
**Review moat**
**Bad****8,698.29**
avg incumbent reviews — the moat a new listing must climb
**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, 16x20x4 air filter is a $1.1M/yr Amazon United States market (165K searches/yr). The top 5 brands hold 86% of demand. Demand peaks in Jul. Verdict: Launch it — 61/100.
Data updated Jul 27, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **16x20x4 air filter market data**
- **Units sold / yr**
- **20K–25K**
- avg 750–1,000/product
- **Revenue / yr**
- **$1.2M–$1.5M**
- units × avg price
- **Conversion rate**
- **11.9%**
- **Avg BSR**
- **#186**
- **Page quality**
- **0%**
- **Prime**
- **33%**
- **Sponsored**
- **86%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **57 months**
- **Avg seller age**
- **179 days**
## **Competition & brand share**
The top 5 products take 61% of clicks — established leaders, but buyers still shop beyond them.
**Brands**
**11 **▲rising
**Sellers**
**42**
**Top-5 brand share**
**86%**
Top 20: 100%
**Top-5 click share**
**61%**
Top 20: 99%
**Open market**
**9%**
- Filterbuy43% - Filtrete19% - Nordic Pure13% - MANN+HUMMEL6% - Honeywell5% - BNX5% - Open — no brand owns it (5 brands, 9%)
## **Demand & seasonality**
Weekly Amazon search volume, last 104 weeks — +18.9% search growth over the last 90 days.
5K4KSpike '24Holiday '24Spike '25Prime Day '25Spike '26Prime Day '26 seasonSepDecMarJunAugNovMarMay
Peak months: Jul · busiest ÷ quietest = 1.6×
[**Open Trend **](https://flapen.com/research/us/tools-home-improvement/16x20x4-air-filter/trend)
## **Top 16x20x4 air filter search terms**
- **16x20x4 air filter**61K/yr+30.3%12.3% conv. - **16x20x4 furnace filter**34K/yr-3.5%9.1% conv. - **air filter 16x20x4**12K/yr+32.3%11.2% conv. - **furnace filter 16x20x4**11K/yr+13.2%6.6% conv. - **16x20x4**9K/yr+20.3%10.2% conv. - **ac filter 16x20x4**5K/yr+102.1%5.3% conv. - **16 x 20 x 4 air filter**7K/yr+50.0%12.3% conv. - **furnace filters 16x20x4**8K/yr-10.5%11.5% conv. - **16x20x4 filter**4K/yr+5.1%8.9% conv. - **16x20x4 air filter merv 11**4K/yr+22.8%9.8% conv. [**All search terms **](https://flapen.com/research/us/tools-home-improvement/16x20x4-air-filter/search-terms)
## **Top 16x20x4 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%$57K10%$115K15%$172K20%$229K101001K10K100K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 21 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Filterbuy 16x20x4 Air Filter MERV 8 Essential Dust & Allergy Defense (2-Pack) Electrostatic Pleated HVAC AC Furnace Filters Replacement Made in USA (Actual Size: 15.50 x 19.50 x 3.63)**Filterbuy**$49.19**4.6★68,921 rev](https://www.amazon.com/dp/B00CK04U3Q) [2**Filtrete 16x20x4 AC Furnace Air Filter MPR 1550 MERV 12 Fits Lennox & Honeywell Allergen Electrostatic Air Cleaning Filter 2-Pack (Actual Size 15.88x19.88x4.31 in)**Filtrete**$54.19**4.6★5,199 rev](https://www.amazon.com/dp/B086DYVPW2) [3**Nordic Pure 16x20x4 (15_1/2 x 19_1/2 x 3_5/8) Pleated MERV 12 Air Filters 2 Pack**Nordic Pure**$41.30**4.5★2,478 rev](https://www.amazon.com/dp/B005ESPBFC) [4**Filterbuy 16x20x4 Air Filter MERV 8 Essential Dust & Allergy Defense (4-Pack) Electrostatic Pleated HVAC AC Furnace Filters Replacement Made in USA (Actual Size: 15.50 x 19.50 x 3.63)**Filterbuy**$77.38**4.4★475 rev](https://www.amazon.com/dp/B00CJZ8YWK) [5**Filtrete 16x20x4 AC Furnace Air Filter MERV 13 MPR 1900 Premium Allergen Bacteria & Virus Filter Electrostatic Air Cleaning Filter 2-Pack (Actual Size 15.44 x 19.75 x 4.31 in)**Filtrete**$47.83**4.3★379 rev](https://www.amazon.com/dp/B0DCGS1B21)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**FilterTime 16x20x4 AC Furnace Air Filter MERV 8 1-Pack (exact dimensions 15.5 x 19.5 x 3.75) AC Filter Furnace Filter Home Air Filter Made in USA.**FilterTime**$21.20**12 rev4mo ago](https://www.amazon.com/dp/B0GTWZR7KV) [**2-Pack 16x20x4 Air Filter Compatible with Honeywell FC100A1003 MERV 13 HVAC Furnace Filter Replacement Actual Size:15.94x19.75x4.38**Aerzva**$44.27**33 rev9mo ago](https://www.amazon.com/dp/B0FR8DVFN4) [**Pro - Source 16x20x4 Pleated Air Filter Wire-Backed Pleated MERV 8 Synthetic Paperboard Frame 300 FPM 1100 CFM Use with Any Unit**PRO SOURCE**$18.85**20 rev11mo ago](https://www.amazon.com/dp/B0FMGQGN5R) [**Filtrete 16x20x4 AC Furnace Air Filter MERV 13 MPR 1900 Premium Allergen Bacteria & Virus Filter Electrostatic Air Cleaning Filter 2-Pack (Actual Size 15.44 x 19.75 x 4.31 in)**Filtrete**$47.83**379 rev1y ago](https://www.amazon.com/dp/B0DCGS1B21) [**BNX TruFilter 16x20x4 (15.5 x 19.5 x 3.63 Slim Fit) MERV 13 Air Filter (2-Pack) - MADE IN USA - Air Conditioner HVAC AC Furnace Filters Health Allergies Mold Bacteria Smoke MPR 1900 FPR 10**BNX**$44.71**171 rev2y ago](https://www.amazon.com/dp/B0D4WRFFD5)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**FilterTime 16x20x4 AC Furnace Air Filter MERV 8 1-Pack (exact dimensions 15.5 x 19.5 x 3.75) AC Filter Furnace Filter Home Air Filter Made in USA.**FilterTime**$21.20**4.2★**▲ 232%**](https://www.amazon.com/dp/B0GTWZR7KV) [**2-Pack 16x20x4 Air Filter Compatible with Honeywell FC100A1003 MERV 13 HVAC Furnace Filter Replacement Actual Size:15.94x19.75x4.38**Aerzva**$44.27**4.1★**▲ 116%**](https://www.amazon.com/dp/B0FR8DVFN4) [**MANN+HUMMEL 16x20x4 MERV 8 Pleated 4 AC Furnace Air Filter. Case of 6**MANN+HUMMEL**$77.74**4.8★**▲ 87%**](https://www.amazon.com/dp/B0CP9V3DRP) [**Pro - Source 16x20x4 Pleated Air Filter Wire-Backed Pleated MERV 8 Synthetic Paperboard Frame 300 FPM 1100 CFM Use with Any Unit**PRO SOURCE**$18.85**4.5★**▲ 37%**](https://www.amazon.com/dp/B0FMGQGN5R) [**Filterbuy 16x20x4 Air Filter MERV 8 Essential Dust & Allergy Defense (2-Pack) Electrostatic Pleated HVAC AC Furnace Filters Replacement Made in USA (Actual Size: 15.50 x 19.50 x 3.63)**Filterbuy**$49.19**4.6★**▲ 32%**](https://www.amazon.com/dp/B00CK04U3Q)
**~~View all trending →~~**
## **What buyers say about 16x20x4 air filter**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Size-Overall**28%
*“Fit like it was made for the HVAC unit”*
**Filtration**17%
*“nice quality filter”*
**Quality-Overall**15%
*“Good quality on construction”*
**Value For Money**13%
*“Good Price”*
**Advertised Vs Actual Product**9%
*“Works as advertised”*
**Durability**3%
*“Fits and durable”*
**Ease Of Use**3%
*“Very Useful”*
**Air Purification**1%
*“provide good air quality”*
**Material Quality**1%
*“Excellent material”*
**Design-Overall**1%
*“Pretty cool design”*
### **What buyers complain about **
**Size-Overall**44%
*“TOO SMALL”*
**Advertised Vs Actual Product**10%
*“Not the size stated”*
**Filtration**9%
*“They came kind of damaged or the filter was missing glue or a staple for the filter portion- it had a big gap between the filter and the cardboard structure”*
**Quality-Overall**6%
*“Cheap quality”*
**Thickness**4%
*“Thickness is also not 4 inches”*
**Assembly/Installation**4%
*“These require assembly”*
**Adhesion/Stickiness**3%
*“baffles glued unevenly”*
**Compatibility-Overall**2%
*“Does not fit a Honeywell filter box that needs 16x20x4”*
**Measurement/Reading Accuracy**2%
*“Not true four inches”*
**Maintenance And Repair**2%
*“Way too expensive to have to be replaced every 3 months”*
### **Top return reasons **
**Size-Overall**73%
**Filtration**14%
**Compatibility-Overall**6%
**Advertised Vs Actual Product**2%
**Thickness**1%
**Thin**1%
**Value For Money**1%
**Certifications**0%
**Defective Material/Parts**0%
**Measurement/Reading Accuracy**0%
## **Common questions**
- **Is 16x20x4 air filter profitable to sell on Amazon United States?**
- The niche generates $1.1M/yr across 21 tracked products. 0 of 3 products launched in the last 360 days are still selling. 90-day search growth is +18.9%. Flapen's verdict: Launch it (61/100).
- **How competitive is the 16x20x4 air filter niche?**
- 11 brands and 42 sellers compete. The top 5 products take 61% of clicks and top 5 brands hold 86% of demand.
- **What do buyers complain about in 16x20x4 air filter?**
- Top complaints mined from reviews: Size-Overall, Advertised Vs Actual Product, Filtration. The return rate is 1.1%.
- **When does demand for 16x20x4 air filter peak?**
- Demand peaks in Jul; the busiest month runs 1.6× the quietest.
- **What does it cost to enter the 16x20x4 air filter niche?**
- Listings span $18.85–$117.85; the average listing price is $58.49 (sweet spot $15–$100). The average incumbent carries 8,698 reviews — the moat a new listing must climb.
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