Direct OEM Compatibility: Fits Lochinvar FTX models (400-725 L/N) and corresponding A

High-Voltage Efficiency: Optimized for 277Vac circuits

System Compatibility: Specifically designed for seamless integration with Maxitrol Selectra Series 44 electronic gas flame modulation

Precision Timing: Optimized for single-stage natural gas operations

BROAN-NuTone 509 Fan 320788-703 Direct OEM Compatibility: Fits LochinvarFor contractors demanding reliable, direct discharge ventilation, the BROAN NuTone 509 Fan delivers robust performance. Engineered for through the wall installation, this unit is ideal for managing humidity and odors in utility spaces. With an airflow rating of 180 CFM and a sound level of 6. 5 Sones, it efficiently moves air without excessive noise, making it suitable for laundry rooms, workshops, and even single car garages up to 195 sq. ft. The