12" x 8" Smoke Pipe Duct Increaser/Reducer, Tapered, 26GA

Lukjan 12" x 8" Galvanized Smoke Pipe Duct Increaser/Reducer

The Lukjan 12" x 8" increaser/reducer is a precision-formed galvanized steel fitting designed for use in HVAC duct systems requiring transitions between unequal pipe diameters. Fabricated from 26-gauge galvanized sheet steel in accordance with ASTM-A653, this component provides a rigid and durable connection that maintains airflow efficiency and minimizes system turbulence.

Application

Engineered for both commercial and residential HVAC systems, the fitting enables secure size transitions between 12" and 8" duct runs. Suitable for use in supply and return air systems, it maintains uniform air distribution while meeting project specifications and code requirements.

Performance Characteristics

• Airflow Transition: Tapered profile minimizes static pressure losses and turbulence at size changes.
• Material Strength: Constructed from galvanized 26 ga steel, offering resistance to corrosion and mechanical deformation.
• Dimensional Accuracy: Machine-formed for consistent sizing and proper fit within duct systems.
• Length: 5 inches overall length provides stable connection and adequate engagement for sealing methods.
• Compliance: Manufactured to ASTM-A653 specifications for galvanized sheet steel products.

Installation Guidelines

For proper performance, joints should be assembled using standard sheet metal connection practices, including mechanical fasteners and approved duct sealants or tapes. Installation spacing and support should comply with SMACNA duct construction standards and local building codes.

Advantages

• Code-Compliant: Meets ASTM-A653 and HVAC ductwork standards.
• Durable Fabrication: Heavy-duty galvanized steel construction ensures long service life.
• Efficient Air Handling: Profile supports smooth airflow transition and reduced system noise.
• Versatile Use: Applicable in both new installations and retrofit duct modifications.

Technical Specifications

• Material: Galvanized steel, 26 ga
• Nominal Sizes: 12" x 8"
• Length: 5 inches
• Standards: ASTM-A653 compliant

The Lukjan 12" x 8" increaser/reducer is designed for professional HVAC applications where durable construction, airflow efficiency, and compliance with industry standards are critical.