A close-up view of the Crescent CTDKNIFE 14-inch duct knife, highlighting its professional-grade stainless steel blade with a finely serrated edge and a smooth, razor-sharp edge. The durable, ergonomic handle features red and black overmolded grips for comfort and control. The knife is presented on its retail packaging with a black heavy-duty protective sheath.
A full-length view of the Crescent CTDKNIFE professional HVAC duct knife with its red and black overmolded ergonomic handle. The knife is securely housed within its black heavy-duty injection-molded carrying sheath, designed for safety, storage, and easy access on a tool belt. The sheath features an integrated belt loop.
A detailed close-up of the professional Crescent CTDKNIFE HVAC insulation cutter's handle. The ergonomic dual-material handle features a textured red and black overmolded grip with prominent finger and hand contact points to maximize comfort, control, and user ergonomics during heavy-duty cutting. The silver butt-end is visible.
A full product kit view of the Crescent CTDKNIFE 14-inch HVAC duct knife and its accompanying heavy-duty protective sheath. The knife is shown removed from the sheath, displaying the full length of the 4.5-inch precision-ground steel blade with both its serrated and smooth cutting edges. Both components are ready for professional flex duct installation.
A close-up view of the Crescent CTDKNIFE 14-inch duct knife, highlighting its professional-grade stainless steel blade with a finely serrated edge and a smooth, razor-sharp edge. The durable, ergonomic handle features red and black overmolded grips for comfort and control. The knife is presented on its retail packaging with a black heavy-duty protective sheath.
A full-length view of the Crescent CTDKNIFE professional HVAC duct knife with its red and black overmolded ergonomic handle. The knife is securely housed within its black heavy-duty injection-molded carrying sheath, designed for safety, storage, and easy access on a tool belt. The sheath features an integrated belt loop.
A detailed close-up of the professional Crescent CTDKNIFE HVAC insulation cutter's handle. The ergonomic dual-material handle features a textured red and black overmolded grip with prominent finger and hand contact points to maximize comfort, control, and user ergonomics during heavy-duty cutting. The silver butt-end is visible.
A full product kit view of the Crescent CTDKNIFE 14-inch HVAC duct knife and its accompanying heavy-duty protective sheath. The knife is shown removed from the sheath, displaying the full length of the 4.5-inch precision-ground steel blade with both its serrated and smooth cutting edges. Both components are ready for professional flex duct installation.
Crescent

Crescent Duct Knife CTDKNIFE 14 Inch Dual Sided Serrated Smooth Blade Hand Tool (4.5 Blade HVAC Insulation Flexible Fiber Acoustic Liner Cutter Sheath)

Only 1 left
SKU: CTDKNIFE
$18.99 USD

Description

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Dual Cutting Edge Steel Geometry for Rapid Flex Duct and Insulation Fabrication

The Crescent CTDKNIFE is a 14-inch professional HVAC duct knife engineered with a 4.5-inch dual-sided steel blade containing a serrated edge and a smooth razor edge. This specialty manual hand tool is designed to cut through flexible acoustic ducting core matrix material and thick fiberglass insulation blankets without tearing or fraying the substrate. The structural configuration features a dual-material ergonomic grip optimized for heavy glove compatibility, an overall weight of 1.1 pounds, and an included heavy-duty injection-molded protective locking sheath for secure tool belt transport across high-density jobsites.

Best Used For:

  • Flexible Duct Cutting: Ripping through core wires, outer vapor barriers, and interior insulation sleeves on flexible HVAC duct lines.
  • Fiberglass Insulation Slicing: Separating bulk foil-faced fiberglass batts and acoustic wall liners cleanly to exact dimensional parameters.
  • Trunk Line Installation: Trimming insulation wrap during rough-in phases across attics, crawlspaces, and narrow ceiling joist frameworks.

Key Performance & Safety Features

  • Dual-Cut Blade Matrix: Alternates a razor-sharp straight edge for clean sliding slices and a robust serrated edge for tearing coarse fibrous materials.
  • Precision-Ground Geometry: Specialized satin-finish steel taper reduces physical user drag forces, lowering cutting fatigue during high-volume field jobs.
  • Dual-Material Ergonomic Handle: Non-slip molded composite handle optimizes hand fit and contact parameters for wet, oily, or heavily gloved environments.
  • Compact Leverage Balancing: Tailored handle-to-blade ratios ensure a closer center of gravity for maximum downward mechanical pressure.
  • Injection-Molded Safety Sheath: High-impact structural protective case snaps securely onto tool belt webbing to avoid unintended exposure scratches.

What's Included

  • (1) Crescent 14-in. Dual-Edge Duct Knife
  • (1) Injection-Molded Protective Sheath

Technical Specifications

Brand Crescent
Model Number CTDKNIFE
Product Type HVAC Duct Knife
Overall Tool Length 14.375 Inches
Blade Length Dimensions 4.5 Inches
Blade Edge Material Steel Alloy
Surface Polish Finish Satin
Edge Profiling Configuration Dual-Sided (Serrated / Smooth Razor)
Handle Construction Type Dual-Material Overmold Comfort Grip
Included Base Storage Injection Molded Locking Sheath
Overall Weight Parameter 1.1 lbs.
Warranty Classification Full Lifetime
UPC Barcode Reference 037103346391
Pro-Tip: When cutting wrapped insulation blankets, pull the knife backward across the foil face utilizing the smooth edge to create a uniform score lane before pushing through with the serrated edge to cleanly slice internal glass fiber without binding the blade core.