There are Pollution Control Spare Parts offered by us which can be used in various places as per the need. The return air grill connects to ductwork that allows air to return to any cooling or heating system. The openings that connect to ducts and other spaces for the returning air are normally covered. Grilles are designed to pull air out of a room, ensuring energy efficiency and relative comfort while also providing circulation back to the central heating or air conditioning unit. The Pollution Control Spare Parts are very efficient and useful.