Field Controls 46231900 MAS-1 Makeup Air Device with 6" Air Hood

The Field Controls 46231900 MAS-1 is a makeup air device designed to automatically supply fresh outdoor air into residential spaces when kitchen exhaust systems are in operation. This unit helps maintain proper air pressure balance and prevents negative pressure issues that can cause backdrafting of combustion appliances.

Key Features:

• Includes 6-inch air hood for outdoor air intake
• Motorized damper opens automatically when exhaust fan operates
• Pressure-activated control system ensures proper airflow
• Helps meet building codes requiring makeup air for high-CFM range hoods
• Prevents negative pressure that can affect furnaces, water heaters, and fireplaces
• Designed for residential HVAC applications

This makeup air system is essential for homes with powerful kitchen ventilation systems (typically 400+ CFM) to ensure safe operation of fuel-burning appliances and maintain indoor air quality. The included air hood provides weather protection for the outdoor air intake point.