While a lower MERV rating may reduce static pressure

For ammonia systems

this differential pressure switch provides the mechanical consistency required for modern Sterling heating equipment

Always verify your specific model number and serial number to confirm the correct high-side refrigerant valve application

Honeywell V5097A1004 Gas Valve 321702-401 While a lower MERV ratingThe Honeywell V5097A1004 Gas Valve is an industrial grade, 2 way normally closed safety shutoff valve designed for precision fuel control in commercial and industrial burner applications. This small body low pressure integrated valve is versatile, supporting multiple pipe sizes including 3 4", 1", 1 1 4", and 2" through the use of specific NPT or BSP adapters. Engineered for on off gas flow control, it is fully compatible with natural gas or LP gas