Resideo ZD16X18TZ Damper 321894-709 When diagnosing a cracked heat

When diagnosing a cracked heat exchanger or assessing soot accumulation

Engineered with a durable porcelain bushing and a high-grade iron core construction

This subbase is specifically designed to mate with the Honeywell Q674E1460 and compatible Daikin-McQuay interface modules used in commercial PTAC applications

then thread the new operator onto the existing valve base

Maximum Flow Efficiency: Forged brass body with full-port openings reduces turbulence and pressure drop in the liquid or suction line

Resideo ZD16X18TZ Damper 321894-709 When diagnosing a cracked heatThe Resideo ZD16X18TZ is a robust 16" Wide X 18" High parallel blade zone damper engineered for precision airflow control in residential and light commercial HVAC zoning applications. Built with a high grade extruded aluminum frame and blades, this unit is designed for long term durability and low leakage performance. The synchronous motor is a 24Vac power closed spring return open actuator, ensuring a fail safe normally open position during power