A sealing brush in a rotary heat exchanger is a component that helps prevent leakage between the rotating wheel and the stationary parts of the heat exchanger. It is typically made of a flexible material of PVC and BCF yarn, and is designed to create a tight seal between the two parts.

The brush for sealing is typically mounted on the rim of the rotating wheel and comes into contact with the stationary casing or ductwork of the heat exchanger. As the wheel rotates, the sealing strip brush rubs against the stationary casing or ductwork, creating a seal that prevents the leakage of air or other fluids.

It is an essential component of a rotary heat exchanger, as sealing brush helps ensure the efficient transfer of heat between the two fluid streams. If this product becomes damaged or worn over time, it can cause leakage and a decrease in the efficiency of the heat exchanger. It is important to regularly inspect and replace the sealing strip as needed to ensure the proper functioning of the heat exchanger.