638-131

This premium 3-inch to 4-inch metal vent increaser is a professional-grade ducting adapter designed to transition smaller ventilation outlets to larger exhaust systems. Essential for HVAC installations, clothes dryer venting, and bathroom exhaust fans, this durable metal coupler ensures a secure and airtight fit between 3" and 4" pipes. Constructed from high-quality, heat-resistant metal, it is built to withstand the rigors of both hot and cold air exhaust, improving airflow efficiency throughout your home ventilation system. Whether you are performing a DIY repair or a new appliance installation, this duct increaser helps bridge the gap between varying duct sizes while maintaining optimal pressure and reducing lint or debris buildup.
Type: Metal Venting / Ducting Adapter
Size: 3 inch to 4 inch
Dimensions: 4 inches × 3 inches
Application: Commonly used in clothes dryers, bathroom exhaust fans, range hoods, and general HVAC ductwork to transition from a 3-inch appliance outlet or pipe to a standard 4-inch ventilation line.
Specifications: Heavy-duty metal construction for enhanced durability and heat resistance; crimped on one end for easy installation; compatible with rigid and semi-rigid ducting.