duct knife
Skip itA concentrated shelf (top 5 take 83% of clicks) — this niche doesn't clear our bar today.
Returns
Incredible0.5%return rate — above 5% kills the launch gate
Price range
Great$13.62–$40.00cheapest to priciest tracked listing — scored on the share inside $15–$100
Avg price
Great$21.01avg listing price — sweet spot $15–$100
Conversion
Great8.7%search→purchase rate — share of searches ending in a sale
Review moat
Good511.56avg incumbent reviews — the moat a new listing must climb
Market size
Okay$150K$150K/yr · 82K searches
Brand share
Okay89%top-5 brand share — brands hold most of the demand
Growth
Bad-0.8%90-day search growth — must beat 0% to launch
Quality gap
Bad4.7★avg incumbent rating — lower means beatable quality
Competition
Bad83%top-5 click share — a locked-up shelf
According to Flapen's Amazon United States niche tracking, duct knife is a $150K/yr Amazon United States market (82K searches/yr). The top 5 brands hold 89% of demand. Verdict: Skip it — 46/100.
Data updated Jul 29, 2026 · scored weekly · How we score niches
duct knife market data
- Units sold / yr
- 5K–6K
- avg 250–500/product
- Revenue / yr
- $105K–$126K
- units × avg price
- Conversion rate
- 8.7%
- Avg BSR
- #348
- Page quality
- 0%
- Prime
- 89%
- Sponsored
- 33%
- Out of stock
- 2.6%
- Avg brand age
- 62 months
- Avg seller age
- 157 days
Competition & brand share
The top 5 products capture 83% of clicks — a locked-up shelf that new listings rarely crack.Brands
8 falling
Sellers
43
Top-5 brand share
89%
Top 20: 100%
Top-5 click share
83%
Top 20: 100%
Open market
7%
- KLEIN TOOLS56%
- Malco13%
- Midwest Snips7%
- WORKPRO7%
- Milwaukee6%
- KLENK4%
- Open — no brand owns it (2 brands, 7%)
Demand & seasonality
Weekly Amazon search volume, last 104 weeks — -0.8% search growth over the last 90 days.No pronounced peak months · busiest ÷ quietest = 1.4×
Top duct knife search terms
- duct knife48K/yr
- duct knife hvac18K/yr
- milwaukee duct knife9K/yr
- hvac knife4K/yr
- klein duct knife3K/yr
Top duct knife products on Amazon
Each bubble is one product — market share against review moat; bubble size tracks estimated sales, color grades how beatable the incumbent looks.
All 9 tracked products in this niche — three views at once, no toggling.
Top sellers
by 90-day click share
KLEIN TOOLS DK16 Double-Edged Duct Knife Serrated Stainless Steel Blade Designed for Duct Board and Insulation Fixed Blade Knife with Sheath 5-1/2-Inch
KLEIN TOOLS$20.054.8★114 rev
Klein Tools DK06 Knife Serrated Stainless Steel Duct Knife for Flexible Duct and Board with Sheath
KLEIN TOOLS$17.614.7★1,833 rev
Malco DK6S Double-Sided Smooth and Serrated Duct Knife with Sheath For Cutting Flexible Duct and Ductboard Ergonomic Cushion Grip Resharpenable Cutlery Grade Steel Blades
Malco$17.644.7★1,202 rev
MIDWEST Flex Duct Knife 5 Blade - MWT-FDK01
Midwest Snips$19.074.6★362 rev
WORKPRO 8-Inch Insulation Knife Stainless Steel Blade Insulation Cutter
WORKPRO$13.624.5★53 rev
Newest
by launch dateKLEIN TOOLS DK16 Double-Edged Duct Knife Serrated Stainless Steel Blade Designed for Duct Board and Insulation Fixed Blade Knife with Sheath 5-1/2-Inch
KLEIN TOOLS$20.05114 rev
WORKPRO 8-Inch Insulation Knife Stainless Steel Blade Insulation Cutter
WORKPRO$13.6253 rev
PINOZE 8 Insulation Knife Stainless Steel Blade Insulation Cutter w/Laser Scale Dual-Side Serrated Duct Knife Tool with Sheath for Cutting Heat Material Foam/Rockwool/Styrofoam Garden Sod Cutter
Pinoze$14.58180 rev
MIDWEST Flex Duct Knife 5 Blade - MWT-FDK01
Midwest Snips$19.07362 rev
Milwaukee 48-22-1920 Duct Knife
Milwaukee$40.00271 rev
Trending
90-day click momentumWORKPRO 8-Inch Insulation Knife Stainless Steel Blade Insulation Cutter
WORKPRO$13.624.5★
KLEIN TOOLS DK16 Double-Edged Duct Knife Serrated Stainless Steel Blade Designed for Duct Board and Insulation Fixed Blade Knife with Sheath 5-1/2-Inch
KLEIN TOOLS$20.054.8★
Hilmor 1891331 SMTDK Duct Knife - HVAC Sharp Duct Tool Stainless Steel
Hilmor$22.204.6★
PINOZE 8 Insulation Knife Stainless Steel Blade Insulation Cutter w/Laser Scale Dual-Side Serrated Duct Knife Tool with Sheath for Cutting Heat Material Foam/Rockwool/Styrofoam Garden Sod Cutter
Pinoze$14.584.6★
DA71000 KLENK TOOLS Dual Duct / Insulation Knife - Rosewood Handle
KLENK$24.374.7★
What buyers say about duct knife
What buyers praise and complain about, mined from review topics.What buyers love
“The knife is very sharp”
“the build quality is outstanding”
“solid knife, good sheath”
“I gave it 3 stars because it's cheap”
“The sheath is made from a more basic material”
“features a handle with a comfortable grip”
“Fits my hands”
“Out the box this is actually BETTER than I expected”
“it feels very comfortable”
“the knife feels durable enough for daily use”
What buyers complain about
“because it's so dull”
“Everything else has been cutting like butter”
“Dont work without one”
“Poorly put together”
“Damaged”
“it is a bit bigger than I pictured or was pictured”
“It doesnt have the same overall quality or feel as some higher-end insulation knives like Milwaukee”
“we'll see after some heavier use - I may have some concerns about that attachment”
Top return reasons
Common questions
- Is duct knife profitable to sell on Amazon United States?
- The niche generates $150K/yr across 9 tracked products. 1 of 2 products launched in the last 360 days are still selling. 90-day search growth is -0.8%. Flapen's verdict: Skip it (46/100).
- How competitive is the duct knife niche?
- 8 brands and 43 sellers compete. The top 5 products take 83% of clicks and top 5 brands hold 89% of demand.
- What do buyers complain about in duct knife?
- Top complaints mined from reviews: Sharpness, Precision Of Cut, Functionality-Overall. The return rate is 0.5%.
- When does demand for duct knife peak?
- Demand is steady year-round — the busiest month runs 1.4× the quietest.
- What does it cost to enter the duct knife niche?
- Listings span $13.62–$40.00; the average listing price is $21.01 (sweet spot $15–$100). The average incumbent carries 512 reviews — the moat a new listing must climb.