Resideo HR90 Controller 323080-701 What is the primary material

What is the primary material used in this fan guard

effectively preventing furnace ignition failure and flame rollout conditions

and potential tripping of the overcurrent protection

With a 3-7 psi spring range and a generous 4-inch stroke

Resideo HR90 Controller 323080-701 What is the primary materialThe Resideo HR90 TheraPro is an advanced digital radiator controller designed for precise hydronic zone management in residential and light commercial applications. This electronic radiator valve actuator utilizes a clear, backlit adjustable display for seamless integration into any HVAC manifold system or standalone radiator setup. Featuring an M30 x 1. 5 connection, the HR90 is compatible with standard thermostatic radiator valves, providing