Field Controls MAS-1 Make-Up Air System with 6" Intake Hood

The Field Controls MAS-1 Make-Up Air System is a pressure-activated damper system designed to maintain proper air balance in residential HVAC systems. This complete system includes a make-up air damper, 6-inch intake air hood, and mounting template, providing a controlled source of replacement air to minimize house depressurization caused by exhaust fans, dryers, range hoods, and other ventilation devices.

Key Features:

• Pressure-activated damper opens automatically when central fan operates or home becomes depressurized
• 6-inch diameter intake hood installs through exterior wall to allow controlled outdoor air intake
• Adjustable airflow slide allows precise metering from 0-100 CFM to match building requirements
• Mounts on return air plenum where incoming air is tempered and distributed throughout home
• Minimizes depressurization and backdrafting issues in tightly sealed homes
• Supports ASHRAE 62.2 fresh air ventilation standards
• Constructed from galvanized steel for durability
• 10-year manufacturer warranty

The MAS-1 connects the intake hood to the damper via installer-supplied 6-inch galvanized duct pipe (not included). Designed for homes up to 1,000 square feet of living space, this system effectively meters air inflow for proper circulation, combustion safety, and indoor air quality. Professional installation by a licensed HVAC contractor is recommended.