This unit is optimized for NG heating systems

A reading of "OL" or high resistance outside the 10-20 ohm range indicates the silicon carbide has reached its end of life

The components are designed to mitigate back-siphonage risks in low-flow commercial and residential installations

Exceeding the rated 133 PSI differential pressure may cause the vent to lock in the closed position

or use a clamp meter to verify current draw is consistent with the 70W power rating

BROAN-NuTone MD10TU Damper 328140-751 This unit is optimized forThe BROAN NuTone MD10TU is a heavy duty 10 inch universal automatic make up air damper engineered to resolve negative air pressure issues in modern, tight envelope residential construction. Designed for seamless integration with range hoods over 300 CFM, this HVAC pressure relief valve synchronizes with the exhaust system to provide fresh air intake, preventing backdrafting of combustion appliances. The unit features a normally closed motorized damper