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換気扇 20cm

換気扇 20cm clears our launch bar: a $5.3M/yr market growing +22.2% this quarter with returns at 0.6%.

Flapen Score

57
Launch it

Ranks 2,057 of 4,191 DIY・工具・ガーデン niches · on the category median

Market size 98Growth 51Conversion 44Competition 40Returns 97Price range 0Avg price 0Brand share 19Review moat 94Quality gap 83
This niche Category average · 4,191 niches

Is 換気扇 20cm profitable on Amazon?

According to Flapen's Amazon Japan niche tracking, 換気扇 20cm is a ¥5.3M/yr Amazon Japan market (32K searches/yr). The top 5 brands hold 92% of demand. Demand peaks in Jul–Aug. Verdict: Launch it — 57/100.

換気扇 20cm: the Amazon niche in one read

Everything a seller checks before entering, in three answers.

Is the demand real?

Yes. Search demand moved +22.2% over the last 90 days and 3.5% of searches end in a purchase.

¥5.3M

revenue / yr

Units sold / yr1K
Search volume / yr+22.2%32K
Conversion rate3.5%
Avg price¥4727.76

Who owns the niche?

The top 5 brands hold 92% of demand, so 8% of the market is open.

8%

open market share

Brands · sellers8 · 119
Top-5 product click share61%
Open market8%
Avg brand age49 months

Is there a way in?

Listing quality. The average product page scores 0/100 on content standards. Incumbents average 4.2★ — the gap to enter on.

0/100

page quality · 16 products

Sponsored placement44%
New entrants (1y)2· 2 succeeded
Avg rating4.2★
Avg reviews116

Top 換気扇 20cm products & what they sell for

Every tracked product — its share of the shelf, its review moat, and what it sells for.

Competition: brands, sellers & click share

The top 5 products take 61% of clicks — established leaders, but buyers still shop beyond them.

¥0¥528K¥1.1M¥1.6M¥2.1M1101001K Review Count Sales
Beatable (≤4.3★) Contested Strong incumbent (>4.7★)

Brands

8 falling

Sellers

119

Top-5 brand share

92%

Top 20: 100%

Top-5 click share

61%

Top 20: 100%

Open market

4%

  • 高須産業(Takasu Sangyo)40%
  • パナソニック(Panasonic)24%
  • Umillion13%
  • YUASA PRIMUS10%
  • オーム(OHM)4%
  • 日本電興株式会社3%
  • Open — no brand owns it (2 brands, 4%)

換気扇 20cm demand & seasonality

Weekly search volume, with the niche's key stats alongside.

Volume32KCVR3.5%Products16Brands8Top 5 Brands92%OOS Rate0.4%Rating4.2★Reviews116Avg BSR#147
1K750Spike '25Prime Day '25Black Friday '25Holiday '25Spike '26Prime Day '26SepDecMarJunAugNovMarMay

Peak months: Jul, Aug · busiest ÷ quietest = 2.0×

What reviews say buyers love and hate about 換気扇 20cm

What buyers mention most, as a share of all reviews.

What buyers love

96% of reviews
組み立て/インストール30%

取り付けは簡単で、良い商品です

コストパフォーマンス25%

リーズナブル

騒音レベル20%

静かです

サイズ全体5%

コンパクトなサイズでフード内に収まりました。

総合品質4%

良い商品だと思います。

What buyers complain about

87% of reviews
材料の品質30%

プラスチック

コストパフォーマンス20%

安さなりの理由がありました。

騒音レベル20%

かなりうるさい

可燃性10%

もし火災が起きた場合防火できないと思います。

組み立て/インストール7%

説明書は良く読まないといけませんね🥲取り付け時間は取り外しも含め、ボルトでモタモタしたので25分くらいだったかなと思います。

換気扇 20cm return rate & reasons

Why buyers send it back, as a share of all return requests.

0.6%

Return rate

0%

Fixable by listing

The "fixable" share counts expectation-mismatch reasons — size, look, advertised-vs-actual — that better copy and images address.

1サイズ全体
78%
2機能全体
6%
3追加アイテム/添付ファイル
4%
4互換性-全体
3%
5エシカルトレード/フェアトレード
2%

Common 換気扇 20cm questions

The questions sellers ask about this niche, answered from the tracked metrics.

Flapen scores 換気扇 20cm 57/100 on Amazon Japan — Launch it. The niche generates ¥5.3M/yr across 16 tracked products. 2 of 2 products launched in the last 360 days are still selling. Search demand moved +22.2% over the last 90 days.
Search demand for 換気扇 20cm on Amazon Japan peaks in Jul–Aug, where the busiest month runs 2.0× the quietest.