Depending on the specific PopTop actuator used (AG or AH series)

the internal silicone diaphragm is designed to withstand air or combustion byproducts that do not degrade silicone materials

Mechanical L8148 models utilize a capillary tube and bulb or a different resistance profile

durable seat O-rings

Carrier 123324-005 Prefilter Els PW 17895 Depending on the specific PopTopThe Carrier 123324 005 Prefilter is a critical first stage filtration component designed for specific Carrier air handling units and commercial HVAC systems. Measuring exactly 16x12 inches, this washable aluminum mesh filter is engineered to capture large airborne particulates and debris before they reach higher efficiency secondary filters or sensitive internal coils. By maintaining low static pressure and high airflow velocity, this 16x12 prefilter