20x25x5 Air Filter Market Report: Sales Volume, Market Share, Leading Brands & Market Trends

Filterbuy is the best-performing 20x25x5 air filter brand in July 2026, moving 16,000 units across 4 ASINs for 50.0% of Top 10 volume. Filtrete follows with 12,000 units (37.5%), ahead of Lennox on 2,000 units (6.3%).

With 5 brands splitting the Top 10 and 93.8% of volume sitting with three of them, this is a concentrated shelf — the leaders hold multiple listings or one very high-velocity ASIN, so a new entrant competes against established review moats rather than an open field. Average selling prices among the leaders run from $43.05 to $67.25, which frames the price band a competing listing has to justify.

Based on July 2026 data, this shortlist surfaces the two kinds of ASIN worth keeping an eye on — the ones that just broke into the Top 10, and the ones growing fastest month over month. On the growth side, B01DLSK92Q leads positive momentum with ▲ 300.0% MoM growth on 400 units, with B00NVICH7W close behind at ▲ 100.0% MoM on 2K units.

The two signals carry different weight. A fresh entrant means share has already changed hands — an incumbent gave up its place to make room, so any competitive set drawn up a month ago is now out of date. A steep growth rate works as the earlier warning: it marks demand that is still compounding, usually a month or two before the ranking catches up to it.