This 3-inch blade is typically found in specific power-vented units where space is a constraint

the ETR503 eliminates the need for field calibration

While similar in function

The System Sensor DST10 is a heavy-duty metal duct sampling tube engineered for duct smoke detection across wide-span HVAC systems

the board may run the cycle until the safety timeout (usually 10 minutes) is reached

Belimo ZG-TF2 Adaptor Kit This 3-inch blade is typicallyThe Belimo ZG TF2 Crankarm Adaptor Kit is a field proven solution for damper actuator retrofit applications where direct coupling to the damper shaft is physically obstructed or impossible. Specifically engineered for the Belimo TF series actuators, this kit enables seamless integration of TFB(X) spring return actuators into existing mechanical linkages, effectively replacing legacy foot mounted, crankarm style units from Honeywell, Johnson Controls,