Resideo ZD20X16TZ Damper L99H008 and the 7058-1018 model

and the 7058-1018 model

Rigid quality control standards provide resistance against moisture and mechanical wear

Field diagnostics should focus on verifying input voltage and continuity across the safety string

making it a staple for technicians maintaining tankless heater kits and domestic hot water loops

Contractors often utilize this 24 volt HVAC relay to restore proper fan timing and multi-point circuit isolation

Resideo ZD20X16TZ Damper L99H008 and the 7058-1018 modelThe Resideo ZD20X16TZ is a professional grade rectangular zone damper engineered for tight airflow control in multizone forced air systems. This 20x16 parallel blade damper utilizes a 24VAC synchronous motor mounted on the 16 inch side, featuring a power closed spring return open configuration. Designed for fail safe operation, it automatically reverts to the open position during power loss to ensure continuous ventilation. The assembly is constructed