ensuring the internal orifice and bulb response match the original system design

this component is rated for a wide high-temperature range beginning at -29°C (-20°F)

it handles a maximum input pressure limit of 300 psig and provides a reliable air flow capacity of 25 scfm

With an IP65 weatherproof rating when used with a cover

Markel 05460702 Switch R-448A ensuring the internal orifice andThe Markel 05460702 is a field proven air flow switch designed to provide precise differential pressure monitoring in heating and cooling applications. As the direct replacement for the legacy MRH 1505 DO, this switch is a critical safety component that confirms positive airflow within a duct before allowing heat kits or compressors to engage. Engineered for low pressure environments, it features a fixed setpoint of 0. 5" WC (water column), ensuring