Field Controls IAH-4 Combustion Air System Intake Hood

The Field Controls IAH-4 Combustion Air System Intake Hood is a round, 4-inch intake hood engineered to deliver clean, regulated combustion air to compatible burners and furnaces. This component features a round design for universal mounting and straightforward duct connection, and is used on multiple CAS models, including CAS-2B, CAS-2C, CAS-2W, CAS-2B90E, CAS-2C90E, CAS-3, and CAS-4.

Built to meet industry standards for intake components, the IAH-4 aligns with Field Controls' CAS series to ensure proper air delivery and safe combustion performance. When replacing aging intake hoods, it provides a precise fit for standard ductwork and mounting patterns in residential and light commercial systems, supporting reliable airflow and consistent operation. Its compact 4-inch footprint fits through typical service openings and pairs with a wide range of CAS access points for easy installation and long-lasting service.

• Type: Round
• Size: 4 Inch
• Used On: CAS-2B, CAS-2C, CAS-2W, CAS-2B90E, CAS-2C90E, CAS-3, CAS-4 combustion air systems
• Category: Combustion Air System Intake Hood