638-108

This 4-inch to 5-inch metal vent increaser is a professional-grade ducting adapter designed to transition airflow from a smaller diameter pipe to a larger one. Ideal for a variety of residential and commercial ventilation needs, this increaser is commonly used with clothes dryers, kitchen range hoods, and bathroom exhaust fans to ensure a secure, airtight connection between different sizes of ductwork. Its durable metal construction provides excellent heat resistance and longevity, making it a reliable choice for high-temperature appliance venting. Whether you are performing an HVAC repair or installing a new appliance, this transition fitting helps optimize airflow efficiency and maintain proper ventilation system performance.
Type: Metal Venting / Duct Adapter
Size: 4 inch to 5 inch
Dimensions: Standard transition length × 5 inch (large end) × 4 inch (small end)
Application: Used to connect 4-inch exhaust outlets to 5-inch ducting in dryer vents, kitchen range hoods, bathroom fans, and general HVAC systems.
Specifications: High-heat resistant metal construction; tapered design for minimal airflow resistance; compatible with rigid and flexible metal ducting.