This is a New Field Controls, Vangaurd Technology, Power Venter. Field Controls part # PVG-300. Grainger Part #:45DX32. 
Missing Pressure Switch, & Slide Damper.

Power Venter, Application Furnaces, For Fuel Type LP, Natural Gas, For Appliance Type Boilers, Furnaces, Water Heaters, Maximum Vent Pipe Diameter 4 in, Minimum Vent Pipe Diameter 4 in, Maximum Heater BTU Input for Gas Appliance 310,000 BtuH, Maximum Heater BTU Input for Oil Appliance Not Applicable, Inlet Diameter 4 in, Outlet Diameter 4 in, For Vent Pipe Diameter 4 in, Compatible with Brand Tjernlund, Replacement For Manufacturer Model Number HS1, HST-1, HSUL-1, Nameplate Voltage 115V AC

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