The Lennox 13X93 (RCD Corp 109011) #9 Mastic Air Duct Sealant is a professional-grade, fiber-reinforced sealant designed for both low- and high-velocity HVAC air distribution systems. Formulated to meet demanding residential and commercial duct sealing applications, this white mastic provides long-lasting adhesion to metal, fiberglass, and flexible duct materials. Its easy-to-apply 10.6 oz cartridge delivers clean, consistent coverage for sealing joints, seams, and penetrations, improving system efficiency and reducing conditioned air loss. Trusted by HVAC technicians for reliability, weather resistance, and code compliance.

 

Key Features:

• Fiber-reinforced mastic for low- to high-velocity air ducts
• Excellent adhesion on metal, fiberglass, and flexible ductwork
• White finish for professional installation appearance
• Reduces air leakage and enhances system efficiency
• Compatible with residential and commercial HVAC systems
• 10.6 oz cartridge fits standard caulking guns
• Durable, long-lasting seal

 

Technical Specifications:

Brand: RCD Corporation
Model: 109011
Lennox Part: 13X93
Sealant Type: Fiber-reinforced mastic
Color: White
Application: Low to high velocity duct systems
Container Size: 10.6 oz cartridge