This Reducer/Increaser is designed to reduce or increase by 4, 5, or 6 inches. You can use it to connect two different ducts to a ventilator or vice versa. It has a galvanized steel coating that makes it rust-free and ensures long life. 

Reducer/Increaser can be used with hydroponics, kitchens, tumble dryers, inline ventilators, etc. It forms an airtight seal when used with duct clamps or duct tapes.

Specifications:

• SKU/ Model: DL-402064

• Brand: DL Wholesale

• Material: Galvanized steel

• Size: 4 to 6 inch