on the air entering side and closed on the air leaving side. These pockets force the air to change directions many times while passing through the filter, which causes the dirt...

construction consists of a durable, corrosion resistant U-Channel frame and a heavy gauge expanded metal (Model PFE) or welded wire (Model PFW) support grid on the air leaving... side. An optional double-hinged wire door on the air entering side provides maximum media support. All corners of the frame are precision mitered for smooth, even edges. Product...

Multiple layers aluminum mesh,corrugated and aligned in unique pattern to optimize air flow and efficiency. Expanded metal retainers on both sides for strength and durability...