12" x 10" Smoke Pipe Duct Increaser/Reducer, Tapered, 26GA

Lukjan 12" x 10" Smoke Pipe Duct Increaser/Reducer – Professional HVAC Transition Fitting

The Lukjan 12" x 10" smoke pipe duct increaser/reducer is a precision-formed transition fitting designed for professional HVAC installations. Fabricated from galvanized steel to industry standards, this component provides a reliable connection between unequal duct sizes, maintaining consistent airflow and system balance in both residential and commercial applications.

Performance and Design Features

• Heavy-Duty Galvanized Steel: Manufactured from 26-gauge galvanized sheet steel with G-30 lock-forming quality for strength and corrosion resistance.
• Accurate Fit: Machine-formed for dimensional consistency, ensuring tight joints and reduced field modification.
• Tapered Transition: Provides smooth airflow from 12" to 10", minimizing turbulence and pressure drop across the system.
• Code Compliant: Produced in accordance with ASTM-A653 CS Type B specifications for HVAC ductwork.
• Cross-Application Use: Suitable for both supply and return air ducts in forced-air systems.

Technical Specifications

• Material: 26-gauge galvanized steel
• Nominal Sizes: 12" diameter to 10" diameter
• Length: 5 inches
• Finish: G-30 galvanized coating for corrosion resistance
• Construction: Non-crimped, tapered body

Installation Notes

For best results, installation should be performed by licensed HVAC professionals. Secure all connections with approved sheet metal screws and UL-listed duct sealant or tape to maintain air-tight joints. Proper support spacing and alignment should be observed to prevent system inefficiencies or joint stress.

Contractor Application

For Professional Contractors: This increaser/reducer is a field-proven fitting that reduces labor time and supports compliance with mechanical codes. Its durable construction withstands the rigors of job site installation and long-term service conditions.

For Service Technicians: Ideal for retrofit and repair work where duct size transitions are required without compromising system efficiency or airflow balance.

The Lukjan 12" x 10" smoke pipe duct increaser/reducer is engineered for dependable performance, making it a trusted solution in commercial and residential duct systems.