---
title: "Products — 4 inch duct - Flapen"
canonical_url: "https://flapen.com/research/us/appliances/4-inch-duct/products"
last_updated: "2026-08-08T19:35:20.979Z"
locale: en
meta:
  description: "Niche score 44/100 · $177K/yr market · 132K searches/yr · $14.81 avg price. Doesn't clear our bar today. Data updated Jul 2026."
  "og:description": "Niche score 44/100 · $177K/yr market · 132K searches/yr · $14.81 avg price. Doesn't clear our bar today. Data updated Jul 2026."
  "og:title": "Products — 4 inch duct - Flapen"
---

# **4 inch duct**

**Skip it**

Strong incumbent ratings (4.6★) — this niche doesn't clear our bar today.

Market size 36Growth 31Conversion 83Competition 41Returns 46Price range 70Avg price 73Brand share 42Review moat 25Quality gap 24

**Conversion**

**Great****9.1%**

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

**Avg price**

**Good****$14.81**

avg listing price — sweet spot $15–$100

**Price range**

**Good****$5.54–$36.83**

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

**Returns**

**Okay****3.3%**

return rate — above 5% kills the launch gate

**Brand share**

**Okay****80%**

top-5 brand share — brands hold most of the demand

**Competition**

**Okay****60%**

top-5 click share — leaders hold, buyers still browse

**Market size**

**Okay****$177K**

$177K/yr · 132K searches

**Growth**

**Okay****+4.6%**

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

**Review moat**

**Bad****4,100.67**

avg incumbent reviews — the moat a new listing must climb

**Quality gap**

**Bad****4.6★**

avg incumbent rating — lower means beatable quality

## Products