Field Controls 603400700 Air System

CAS-34U FanInADrum 24/120V

603400700 is the cross of 46266301, 46266302

Field Controls 603400700 CAS-34U Combustion Air System – Fan-in-a-Drum, 24/120V Universal Air Supply

The Field Controls 603400700 CAS-34U Fan-in-a-Drum Combustion Air System is a high-performance, universal air supply solution designed to deliver safe, reliable, and efficient combustion air for oil- or gas-fired appliances. Compatible with 120VAC and 24VAC systems, the CAS-34U supports oil burners up to 3.5 GPH and gas systems up to 450,000 BTU, making it ideal for furnaces, boilers, water heaters, and mechanical room installations.

Building on the proven success of the CAS-3 and CAS-4 models, the CAS-34U offers advanced functionality and improved performance to ensure proper combustion air delivery, reduce draft issues, and enhance overall heating efficiency. Its compact “Fan-in-a-Can” design allows for easy installation in small or restricted spaces, delivering a dependable air supply where traditional ducting is difficult or impractical.

This system also integrates seamlessly with thermopile smart valve water heaters or 30mV gas heaters when paired with the optional CK-20FV control kit, and supports 120V or 24V appliances when combined with CAC-120 or CAC-24 multiple appliance controllers.

Key Features

• Universal combustion air system for oil and gas applications

• Supports Oil: 3.5 GPH and Gas: 450,000 BTU

• Dual voltage compatibility: 24V or 120V systems

• Compact Fan-in-a-Drum design ideal for tight installation areas

• Improves combustion efficiency and appliance performance

• Provides dedicated combustion air for furnaces, boilers, water heaters, and mechanical rooms

• Compatible with CK-20FV, CAC-120, and CAC-24 control kits for expanded system integration

• Reliable operation for Oil, LP, or Natural Gas appliances

Product Details

• Model: CAS-34U

• Part Number: 603400700

• Brand: Field Controls

• Application: Combustion air system for heating equipment

• Voltage: 24V / 120V

The Field Controls 603400700 CAS-34U Combustion Air System provides an efficient, dependable, and compact solution for delivering proper combustion air to modern heating appliances—enhancing safety, reducing energy waste, and improving overall system performance. Perfect for contractors, technicians, and property owners seeking reliable airflow management.

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