---
title: "Search terms — 19 7/8 x 21 1/2 x1 ac filter - Flapen"
canonical_url: "https://flapen.com/research/us/tools-home-improvement/19-7-8-x-21-1-2-x1-ac-filter/search-terms"
last_updated: "2026-08-08T08:00:08.805Z"
locale: en
meta:
  description: "Niche score 50/100 · $174K/yr market. Brand-locked demand (top 5 brands take 100% of clicks) keeps it on the watch list. Data updated Jul 2026."
  "og:description": "Niche score 50/100 · $174K/yr market. Brand-locked demand (top 5 brands take 100% of clicks) keeps it on the watch list. Data updated Jul 2026."
  "og:title": "Search terms — 19 7/8 x 21 1/2 x1 ac filter - Flapen"
---

# **19 7/8 x 21 1/2 x1 ac filter**

**Worth a look**

Shows searches that convert (16.9% search→purchase), but brand-locked demand (top 5 brands take 100% of clicks) keeps it on the watch list.

Market size 36Growth 60Conversion 98Competition 22Returns 87Price range 95Avg price 93Brand share 0Review moat 48Quality gap 19

**Conversion**

**Incredible****16.9%**

search→purchase rate — share of searches ending in a sale

**Price range**

**Incredible****$33.56–$66.74**

cheapest to priciest tracked listing — scored on the share inside $15–$100

**Avg price**

**Great****$49.44**

avg listing price — sweet spot $15–$100

**Returns**

**Great****1.4%**

return rate — above 5% kills the launch gate

**Growth**

**Good****+36.6%**

90-day search growth — must beat 0% to launch

**Review moat**

**Okay****1,732.25**

avg incumbent reviews — the moat a new listing must climb

**Market size**

**Okay****$174K**

$174K/yr · 21K searches

**Competition**

**Bad****73%**

top-5 click share — a locked-up shelf

**Quality gap**

**Bad****4.7★**

avg incumbent rating — lower means beatable quality

**Brand share**

**Bad****100%**

top-5 brand share — brand-locked demand

## Search terms