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16x25x1 fiberglass air filters
Skip itBrand-locked demand (top 5 brands take 100% of clicks) — this niche doesn't clear our bar today.
Returns
Incredible0.7%return rate — above 5% kills the launch gate
Price range
Incredible$29.68–$77.52cheapest to priciest tracked listing — scored on the share inside $15–$100
Avg price
Great$49.41avg listing price — sweet spot $15–$100
Conversion
Okay3.9%search→purchase rate — share of searches ending in a sale
Competition
Okay58%top-5 click share — leaders hold, buyers still browse
Review moat
Bad4,573.65avg incumbent reviews — the moat a new listing must climb
Market size
Bad$77K$77K/yr · 40K searches
Growth
Bad-11.5%90-day search growth — must beat 0% to launch
Quality gap
Bad4.7★avg incumbent rating — lower means beatable quality
Brand share
Bad100%top-5 brand share — brand-locked demand