Field Controls Fan-In-A-Can® 24V Plug-In CAS-4PDesigned to provide combustion air for appliances when direct connection to the burner is not possible (when the appliance is located in a confined space). Designed for optimum safety and includes a proving device that wont allow the burner to engage without the Fan-in-a-Can® operating. Multiple units or additional controls are required for multiple appliance installations. Each unit is equipped with a two speed control for enhanced versatility. When the thermostat calls for heat, the Fan-in-a-Can® engages and begins drawing air into the structure. When air flow is established, the pressure switch closes. The CAS sends a signal to the appliance, allowing the burner to fire. The Fan-in-a-Can® diffuses the outside air into the room near the burner to ensure adequate air for efficient combustion. Made in the USA. Click to View Draft Inducers Click To View Power Venters Click To View Power Venter Contol Kits Product Specifications BRANDField Controls LENGTH INCHES16 WIDTH INCHES11 HEIGHT INCHES16 WEIGHT LBS16.25 BTU HIGH450000 FUEL TYPEGas APPLICATIONBoiler With Automatic Vent Damper INCLUDES4" Intake Air Hood, Fan-in-a-Can, 6" to 4" Reducer, Restrictor Plate ADA-1 LIMITED WARRANTY YEARS1 MANUFACTURER'S PART NUMBERCAS-4P