Hydrotherm BM-8807 Blower Assembly 320788-704 this relief valve must be

this relief valve must be installed in a vertical position with the drain piping sloped away for gravity drainage

and labels

specialized wiring harnesses

Engineered for high-demand gas water heaters and HVAC systems

Hydrotherm BM-8807 Blower Assembly 320788-704 this relief valve must beThe Hydrotherm BM 8807 Blower Assembly is a high performance inducer blower replacement engineered specifically for Hydrotherm GV100 boiler systems. Also identified by the cross reference part number 7021 9093, this unit is essential for maintaining the correct static pressure and venting combustion gasses from the heat exchanger. As an OEM replacement part, it ensures precise fitment and restores the factory specified draft inducer performance