20x25x4.5 air filter
Skip itBrand-locked demand (top 5 brands take 95% of clicks) — this niche doesn't clear our bar today.
Conversion
Incredible13.2%search→purchase rate — share of searches ending in a sale
Returns
Great1.3%return rate — above 5% kills the launch gate
Avg price
Great$77.56avg listing price — sweet spot $15–$100
Review moat
Good807.13avg incumbent reviews — the moat a new listing must climb
Growth
Good+40.0%90-day search growth — must beat 0% to launch
Price range
Good$37.67–$150.24cheapest to priciest tracked listing — scored on the share inside $15–$100
Competition
Bad75%top-5 click share — a locked-up shelf
Quality gap
Bad4.7★avg incumbent rating — lower means beatable quality
Market size
Bad$82K$82K/yr · 8K searches
Brand share
Bad95%top-5 brand share — brand-locked demand
According to Flapen's Amazon United States niche tracking, 20x25x4.5 air filter is a $82K/yr Amazon United States market (8K searches/yr). The top 5 brands hold 95% of demand. Demand peaks in May–Jun–Jul. Verdict: Skip it — 48/100.
Data updated Jul 9, 2026 · scored weekly · How we score niches
20x25x4.5 air filter market data
- Units sold / yr
- 1K–1K
- avg 0–100/product
- Revenue / yr
- $78K–$97K
- units × avg price
- Conversion rate
- 13.2%
- Avg BSR
- #559
- Page quality
- 0%
- Prime
- 25%
- Sponsored
- 88%
- Out of stock
- 0.9%
- Avg brand age
- 80 months
- Avg seller age
- 161 days
Competition & brand share
The top 5 products capture 75% of clicks — a locked-up shelf that new listings rarely crack.Brands
8 rising
Sellers
69
Top-5 brand share
95%
Top 20: 100%
Top-5 click share
75%
Top 20: 100%
Open market
3%
- Clean Comfort80%
- Pleatedfold6%
- Filtrete5%
- General Filters3%
- PartTube2%
- AIRx Filters2%
- Open — no brand owns it (2 brands, 3%)
Demand & seasonality
Weekly Amazon search volume, last 101 weeks — +40.0% search growth over the last 90 days.Peak months: May, Jun, Jul · busiest ÷ quietest = 2.5×
Top 20x25x4.5 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.
All 16 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
Clean Comfort AMP-11-2025-45-20 x 25 x 4.5 Media Air Filter MERV 11
Clean Comfort$41.434.8★101 rev
Clean Comfort AMP-11-2025-45 (5-Pack) - 20 x 25 x 4.5 Media Air Filter MERV 11
Clean Comfort$150.244.8★856 rev
Clean Comfort AMP-11-2025-45 (2-Pack) - 20 x 25 x 4.5 Media Air Filter MERV 11
Clean Comfort$66.554.8★856 rev
Clean Comfort AMP-11-2020-45 (2-Pack) - 20 x 20 x 4.5 Media Air Filter MERV 11
Clean Comfort$65.944.8★461 rev
AMP-11-2025-45 20x25x4.5 Replacement Filter MERV 13 Compatible with AMP-11-2025-45 Pleated HVAC Purifier Filter Furnace Air Filters for Home Actual Size: 24.84 x 15.84-19.84 x 4.33 1 Pack
Pleatedfold$40.764.3★8 rev
Newest
by launch dateAMP-11-2025-45 20x25x4.5 Replacement Filter MERV 13 Compatible with AMP-11-2025-45 Pleated HVAC Purifier Filter Furnace Air Filters for Home Actual Size: 24.84 x 15.84-19.84 x 4.33 1 Pack
Pleatedfold$40.768 rev
AMP-11-2025-45 (2-Pack) - 20 x 25 x 4.5 Clean Comfort Air Filter M11 Replacement for Goodman OEM
PartTube$77.8010 rev
Furnace Filters 16x25x4 - HVAC Air Filter Replacement FC100A1029 Merv 11 with Homequip Easy Disposal Bag (2 Pack)
Homequip$76.65991 rev
Filtrete 20x25x4 Air Filter MERV 12 MPR 1550 Certified Asthma & Allergy Friendly 2-Pack Fits Honeywell & AprilAire AC Furnace HVAC Filters Pleated Electrostatic (Actual Size 19.88x24.63x4.31 in)
Filtrete$49.595,142 rev
Filtrete 20x25x4 Air Filter MERV 11 MPR 1000 Micro Allergen Defense 2-Pack Fits Honeywell & AprilAire AC Furnace HVAC Filters for Home Pleated Electrostatic (Actual Size 19.88 x 24.63 x 4.31 in)
Filtrete$45.021,948 rev
Trending
90-day click momentum
AIRX FILTERS WICKED CLEAN AIR. Compatible with Replacememnt for Honeywell 20x25x4 Air Filter Furnace Air Filter AIRx Filters Replacement for Honeywell FC100A1037 FC35A1027 CF200A1016 Allergy 4-Pack
AIRx Filters$93.324.5★
Furnace Filters 16x25x4 - HVAC Air Filter Replacement FC100A1029 Merv 11 with Homequip Easy Disposal Bag (2 Pack)
Homequip$76.654.8★
Clean Comfort AMP-11-1625-45 (1 Pack) 16 x 25 x 4.5 Media Air Filter MERV 11
Clean Comfort$37.674.8★
Clean Comfort AMP-11-1625-45 (5-Pack) - 16 x 25 x 4.5 Media Air Filter MERV 11
Clean Comfort$136.944.6★
AMP-11-2025-45 20x25x4.5 Replacement Filter MERV 13 Compatible with AMP-11-2025-45 Pleated HVAC Purifier Filter Furnace Air Filters for Home Actual Size: 24.84 x 15.84-19.84 x 4.33 1 Pack
Pleatedfold$40.764.3★
What buyers say about 20x25x4.5 air filter
What buyers praise and complain about, mined from review topics.What buyers love
“Quality filters”
“They fit just like expected”
“Fair price”
“NO complaints”
“Product as advertised”
“Easy”
“Sturdy”
“are very easy to install”
“Perfect fit for Honeywell”
“Worked well for our systmen”
What buyers complain about
“DOES NOT FIT”
“Very disappointed as Filtrate has always been my go to brand”
“for $10 less per filter”
“Quality control is not the best. for a brand name”
“the thickness turned out to be the problem”
“I bit on the flimsy side”
“Not very well built”
“Amazon Resale came through”
“So my mistake was not measuring”
“I don't think this would contribute to the noise level anyway”
Top return reasons
Common questions
- Is 20x25x4.5 air filter profitable to sell on Amazon United States?
- The niche generates $82K/yr across 16 tracked products. 0 of 1 products launched in the last 360 days are still selling. 90-day search growth is +40.0%. Flapen's verdict: Skip it (48/100).
- How competitive is the 20x25x4.5 air filter niche?
- 8 brands and 69 sellers compete. The top 5 products take 75% of clicks and top 5 brands hold 95% of demand.
- What do buyers complain about in 20x25x4.5 air filter?
- Top complaints mined from reviews: Size-Overall, Filtration, Value For Money. The return rate is 1.3%.
- When does demand for 20x25x4.5 air filter peak?
- Demand peaks in May–Jun–Jul; the busiest month runs 2.5× the quietest.
- What does it cost to enter the 20x25x4.5 air filter niche?
- Listings span $37.67–$150.24; the average listing price is $77.56 (sweet spot $15–$100). The average incumbent carries 807 reviews — the moat a new listing must climb.