Trane FLR7963 Expandable Filter Els PW 17895 Is this an exact replacement

Is this an exact replacement for the 660921 burner

Foaming usually indicates an air leak at the suction point

Industry Compatibility: Standard Class RK5 physical dimensions for easy replacement in existing 600V fuse blocks

the KH-AFB or KH-10 models are more appropriate

Trane FLR7963 Expandable Filter Els PW 17895 Is this an exact replacementAs a field technician, you know that keeping a systems static pressure within spec is critical for blower motor longevity. The Trane FLR7963 is the OEM replacement air filter specifically engineered for the PerfectFit enclosure. Unlike standard flat panel filters, this 5 inch expandable media utilizes a deep pleated synthetic design to maximize surface area and minimize airflow resistance. This is the direct replacement for FLR6232 (and supersedes