---
title: "X6673 Lennox 20x25x5 Merv 11 Filter — $417K/yr Amazon US Niche (2026) - Flapen"
canonical_url: "https://flapen.com/research/us/tools-home-improvement/x6673-lennox-20x25x5-merv-11-filter"
last_updated: "2026-08-08T14:30:03.880Z"
locale: en
meta:
description: "Niche score 48/100 · $417K/yr market · 38K searches/yr · $93.46 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:description": "Niche score 48/100 · $417K/yr market · 38K searches/yr · $93.46 avg price. Doesn't clear our bar today. Data updated Jul 2026."
"og:title": "X6673 Lennox 20x25x5 Merv 11 Filter — $417K/yr Amazon US Niche (2026) - Flapen"
---
# **x6673 lennox 20x25x5 merv 11 filter**
**Skip it**
Brand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.
Market size 56Growth 56Conversion 94Competition 12Returns 95Price range 35Avg price 77Brand share 0Review moat 60Quality gap 17
**Returns**
**Incredible****1.0%**
return rate — above 5% kills the launch gate
**Conversion**
**Great****11.8%**
search→purchase rate — share of searches ending in a sale
**Avg price**
**Great****$93.46**
avg listing price — sweet spot $15–$100
**Review moat**
**Good****1,116.4**
avg incumbent reviews — the moat a new listing must climb
**Market size**
**Good****$417K**
$417K/yr · 38K searches
**Growth**
**Good****+29.6%**
90-day search growth — must beat 0% to launch
**Price range**
**Okay****$39.42–$210.17**
cheapest to priciest tracked listing — scored on the share inside $15–$100
**Quality gap**
**Bad****4.7★**
avg incumbent rating — lower means beatable quality
**Competition**
**Bad****85%**
top-5 click share — a locked-up shelf
**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, x6673 lennox 20x25x5 merv 11 filter is a $417K/yr Amazon United States market (38K searches/yr). The top 5 brands hold 100% of demand. Demand peaks in Sep–Dec. Verdict: Skip it — 48/100.
Data updated Jul 27, 2026 · scored weekly · [~~How we score niches ~~](https://flapen.com/research/methodology)
## **x6673 lennox 20x25x5 merv 11 filter market data**
- **Units sold / yr**
- **5K–6K**
- avg 250–500/product
- **Revenue / yr**
- **$467K–$561K**
- units × avg price
- **Conversion rate**
- **11.8%**
- **Avg BSR**
- **#196**
- **Page quality**
- **0%**
- **Prime**
- **20%**
- **Sponsored**
- **100%**
- **Out of stock**
- **0.0%**
- **Avg brand age**
- **44 months**
- **Avg seller age**
- **181 days**
## **Competition & brand share**
The top 5 products capture 85% of clicks — a locked-up shelf that new listings rarely crack.
**Brands**
**5 **▼falling
**Sellers**
**24**
**Top-5 brand share**
**100%**
Top 20: 100%
**Top-5 click share**
**85%**
Top 20: 100%
**Open market**
**0%**
- HEALTHY CLIMATE63% - Lennox25% - Filtrete7% - Pitymody3% - AirPurete3%
## **Demand & seasonality**
Weekly Amazon search volume, last 67 weeks — +29.6% search growth over the last 90 days.
4K3KSpike '25Prime Day '25Holiday '25Prime Day '26 seasonMayJunJulAugSepOctNovDecJanFebMarAprMayJun
Peak months: Sep, Dec · busiest ÷ quietest = 6.3×
[**Open Trend **](https://flapen.com/research/us/tools-home-improvement/x6673-lennox-20x25x5-merv-11-filter/trend)
## **Top x6673 lennox 20x25x5 merv 11 filter search terms**
- **lennox 20x25x5 air filter**12K/yr+50.7%4.7% conv. - **x6673 lennox 20x25x5 merv 11 filter**9K/yr+24.5%14.9% conv. - **x6673**6K/yr+25.4%10.6% conv. - **healthy climate solutions filter 20x25x5**6K/yr+15.1%11.9% conv. - **lennox x6673**4K/yr+8.0%10.7% conv. [**All search terms **](https://flapen.com/research/us/tools-home-improvement/x6673-lennox-20x25x5-merv-11-filter/search-terms)
## **Top x6673 lennox 20x25x5 merv 11 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%$63K30%$125K45%$188K60%$250K101001K10K Reviews — right = deep review moatMarket share (90d) ≈ est. sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)
All 10 tracked products in this niche — three views at once, no toggling.
### **Top sellers**
by 90-day click share
[1**Lennox X6673 20x25x5 Air Filter MERV 11 HVAC AC Furnace Filters Lennox Healthy Climate Filter for Home with Cleaning Cloth 2-Pack (Actual Size: 19.75 x 24.75 x 4.38 Inches)**HEALTHY CLIMATE**$65.23**4.6★105 rev](https://www.amazon.com/dp/B0FN5ZGT1Z) [2**Lennox X6673 Healthy Climate HCF20-11 MERV 11 Filter Media (2 Pack)**Lennox**$66.22**4.8★5,072 rev](https://www.amazon.com/dp/B008D7URTG) [3**Filtrete 20x25x5 Air Filter MERV 11 MPR 1000 Micro Allergen Defense 2-Pack Fits Lennox AC Furnace HVAC Filters for Home Pleated Electrostatic (Actual Size 19.63 x 24.75 x 4.31 in)**Filtrete**$46.52**4.6★2,304 rev](https://www.amazon.com/dp/B0BVXDDZH7) [4**Lennox X6675 20x25x5 Air Filter Lennox Healthy Climate Carbon Clean Merv 16 Home Furnace Filter for HVAC system 2 Pack with Cleaning Cloth**HEALTHY CLIMATE**$210.17**4.8★411 rev](https://www.amazon.com/dp/B074XHSNVB) [5**Lennox X6675 20x25x5 Healthy Climate Carbon-Clean MERV 16 Filter Bundle with Same Day Supply Filter Change Reminder Magnet (1-Pack)**Lennox**$113.90**4.8★855 rev](https://www.amazon.com/dp/B09YMF4R6J)
**~~View all top sellers →~~**
### **Newest**
by launch date
[**Lennox Healthy Climate X6673-20 x 25 x 5 Healthy Climate HCF20-11 Air Filter MERV 11 Filter Bundle with Same Day Supply Filter Change Reminder Magnet (2-Pack)**HEALTHY CLIMATE**$65.57**42 rev8mo ago](https://www.amazon.com/dp/B0G275S2FM) [**Lennox Healthy Climate X6673-20 x 25 x 5 Healthy Climate HCF20-11 Air Filter MERV 11 Filter Bundle with Same Day Supply Filter Change Reminder Magnet (4)**HEALTHY CLIMATE**$118.39**42 rev8mo ago](https://www.amazon.com/dp/B0G2758762) [**Lennox X6673 20x25x5 Air Filter MERV 11 HVAC AC Furnace Filters Lennox Healthy Climate Filter for Home with Cleaning Cloth 2-Pack (Actual Size: 19.75 x 24.75 x 4.38 Inches)**HEALTHY CLIMATE**$65.23**105 rev11mo ago](https://www.amazon.com/dp/B0FN5ZGT1Z) [**Pitymody X6675 Merv 16 Air Filter 20x25x5 Efficient Air Filter Compatible with Lennox X6675 and Lennox HCC20-28 Furnace HVAC System Part Number HCF20-16 2 Pack**Pitymody**$112.44**313 rev2y ago](https://www.amazon.com/dp/B0CPF7TBT6) [**Filtrete 20x25x5 Air Filter MERV 11 MPR 1000 Micro Allergen Defense 2-Pack Fits Lennox AC Furnace HVAC Filters for Home Pleated Electrostatic (Actual Size 19.63 x 24.75 x 4.31 in)**Filtrete**$46.52**2,304 rev3y ago](https://www.amazon.com/dp/B0BVXDDZH7)
**~~View all new products →~~**
### **Trending**
90-day click momentum
[**Lennox Healthy Climate X6673-20 x 25 x 5 Healthy Climate HCF20-11 Air Filter MERV 11 Filter Bundle with Same Day Supply Filter Change Reminder Magnet (4)**HEALTHY CLIMATE**$118.39**4.8★**▲ 103%**](https://www.amazon.com/dp/B0G2758762) [**Lennox Healthy Climate X6673-20 x 25 x 5 Healthy Climate HCF20-11 Air Filter MERV 11 Filter Bundle with Same Day Supply Filter Change Reminder Magnet (2-Pack)**HEALTHY CLIMATE**$65.57**4.8★**▲ 71%**](https://www.amazon.com/dp/B0G275S2FM) [**Lennox X6673 20x25x5 Air Filter MERV 11 HVAC AC Furnace Filters Lennox Healthy Climate Filter for Home with Cleaning Cloth 2-Pack (Actual Size: 19.75 x 24.75 x 4.38 Inches)**HEALTHY CLIMATE**$65.23**4.6★**▲ 64%**](https://www.amazon.com/dp/B0FN5ZGT1Z) [**Lennox X6675 20x25x5 Air Filter Lennox Healthy Climate Carbon Clean Merv 16 Home Furnace Filter for HVAC system 2 Pack with Cleaning Cloth**HEALTHY CLIMATE**$210.17**4.8★**▲ 60%**](https://www.amazon.com/dp/B074XHSNVB) [**Pitymody X6675 Merv 16 Air Filter 20x25x5 Efficient Air Filter Compatible with Lennox X6675 and Lennox HCC20-28 Furnace HVAC System Part Number HCF20-16 2 Pack**Pitymody**$112.44**4.7★**▲ 42%**](https://www.amazon.com/dp/B0CPF7TBT6)
**~~View all trending →~~**
## **What buyers say about x6673 lennox 20x25x5 merv 11 filter**
What buyers praise and complain about, mined from review topics.
### **What buyers love **
**Filtration**27%
*“Excellent Filters”*
**Size-Overall**21%
*“Fits great”*
**Value For Money**19%
*“Best price”*
**Quality-Overall**14%
*“Excellent Quality”*
**Advertised Vs Actual Product**5%
*“just as advertised”*
**Efficiency**4%
*“Works beautifully”*
**Assembly/Installation**3%
*“Easy to install”*
**Ease Of Use**2%
*“Quick and easy”*
**Strength**1%
*“Seems effective”*
**Allergies**1%
*“have had no issues with allergens”*
### **What buyers complain about **
**Size-Overall**54%
*“Didn't fit”*
**Compatibility-Overall**6%
*“Does not fit Lennox EL296UHV”*
**Quality-Overall**6%
*“I would expect better quality assurance”*
**Filtration**6%
*“Not all filters are the same”*
**Value For Money**5%
*“just more expensive”*
**Thickness**3%
*“a bit too thin”*
**Measurement/Reading Accuracy**2%
*“O. Don't buy this its not a true 20x25x5 clearly they don't haven't measured this”*
**Ease Of Use**2%
*“I have trouble getting the door to close”*
**Drainage**2%
*“Money down the drain”*
**Strength**2%
*“They still are flimsy”*
### **Top return reasons **
**Size-Overall**69%
**Filtration**16%
**Compatibility-Overall**8%
**Value For Money**2%
**Advertised Vs Actual Product**2%
**Defective Material/Parts**1%
**Functionality-Overall**1%
**Product Condition**1%
**Ease Of Use**0%
**Maintenance And Repair**0%
## **Common questions**
- **Is x6673 lennox 20x25x5 merv 11 filter profitable to sell on Amazon United States?**
- The niche generates $417K/yr across 10 tracked products. 3 of 3 products launched in the last 360 days are still selling. 90-day search growth is +29.6%. Flapen's verdict: Skip it (48/100).
- **How competitive is the x6673 lennox 20x25x5 merv 11 filter niche?**
- 5 brands and 24 sellers compete. The top 5 products take 85% of clicks and top 5 brands hold 100% of demand.
- **What do buyers complain about in x6673 lennox 20x25x5 merv 11 filter?**
- Top complaints mined from reviews: Size-Overall, Compatibility-Overall, Quality-Overall. The return rate is 1.0%.
- **When does demand for x6673 lennox 20x25x5 merv 11 filter peak?**
- Demand peaks in Sep–Dec; the busiest month runs 6.3× the quietest.
- **What does it cost to enter the x6673 lennox 20x25x5 merv 11 filter niche?**
- Listings span $39.42–$210.17; the average listing price is $93.46 (sweet spot $15–$100). The average incumbent carries 1,116 reviews — the moat a new listing must climb.
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