8" x 4" Smoke Pipe Duct Increaser/Reducer, Tapered, 26GA

Lukjan 8" x 4" Smoke Pipe Duct Increaser/Reducer – Durable Transition Fitting for HVAC Systems

The Lukjan 8" x 4" Smoke Pipe Duct Increaser/Reducer is engineered to provide a precise size transition while maintaining airflow integrity in heating and ventilation systems. Built from galvanized steel with G-30 lock forming quality, this component is designed for long service life in residential and commercial ductwork installations.

Key Features

• Precision Fit: Non-crimped tapered design ensures accurate transitions between 8" and 4" ducts with minimal air leakage.
• Durable Material: Fabricated from 28–30 gauge galvanized steel with G-30 coating for corrosion resistance and mechanical strength.
• ASTM Compliance: Manufactured to ASTM-A653 CS type B standards, ensuring reliability across projects.
• Versatility: Suitable for both new installations and retrofit applications across residential, commercial, and light industrial systems.
• Consistent Manufacturing: Coil-fed automated production lines deliver uniform sizing for seamless field assembly.

Technical Specifications

• Transition Size: 8" diameter to 4" diameter
• Length: 5 inches
• Material: Galvanized steel, G-30 coating
• Gauge: 28–30 GA (per size availability)
• Design: Non-crimped, tapered reducer

Installation Notes

Installation requires proper measuring, fastening, and sealing to ensure system efficiency. Fasten with sheet metal screws and seal joints with approved duct sealant or tape to prevent leakage. For code compliance and optimal results, installation should be performed by a licensed HVAC contractor. When field-installed, all safety protocols and local mechanical code requirements should be observed.

Applications

For Contractors: Built to handle demanding field conditions, this reducer provides a reliable transition for ductwork while maintaining airflow balance. Its ASTM-certified fabrication ensures compliance on commercial and residential projects.

For Skilled Installers: Easy to handle in the field, with consistent sizing that minimizes rework and speeds up installations. The robust galvanized steel design withstands frequent handling and long-term service.

Performance Assurance

The Lukjan 8" x 4" Smoke Pipe Duct Increaser/Reducer is a professional-grade component that ensures secure connections, reliable airflow, and lasting durability in HVAC systems.