IO Hvac Controls MUA-08 Damper Kit

The iO HVAC Controls MUA-08 is a professional-grade make-up air damper kit designed to address negative pressure issues in residential and light commercial structures. This 8-inch motorized damper operates on a Power Open / Spring Close (PO/SC) logic, ensuring a fail-safe return to the closed position when de-energized. The kit integrates a high-sensitivity air pressure switch with an adjustable setpoint range of .08" to 1.20" WC, allowing for precise calibration based on the specific CFM requirements of exhaust fans or range hoods. By automating the intake of fresh air, the MUA-08 prevents backdrafting of combustion appliances and maintains indoor air quality. The included 24V 20VA transformer provides a dedicated power source for the actuator, simplifying field wiring. Built with a heavy-duty galvanized steel sleeve, this HVAC fresh air intake solution ensures long-term reliability in demanding mechanical environments and facilitates code compliance for high-CFM ventilation systems.

Key Benefits

• Pressure Neutralization: Effectively mitigates negative pressure caused by high-capacity exhaust systems to prevent "tight house" ventilation failures.
• Adjustable Sensing: The differential pressure switch allows technicians to fine-tune the engagement threshold from 0.08" to 1.20" WC for varied static pressure environments.
• Fail-Safe Design: The spring return actuator ensures the damper seals tight whenever the system is inactive, preventing uncontrolled infiltration.
• Complete Package: Includes the 8" round damper, pressure sensor, and 20VA transformer for a streamlined installation without sourcing external components.

Common Questions

How do I wire the MUA-08 pressure switch to the damper?
The included pressure switch detects the pressure drop when an exhaust fan activates. You must wire the switch in series with the 24V transformer and the damper actuator terminals. When the switch closes upon sensing airflow, the circuit completes, and the damper motors open.

Where should the pressure switch probe be located?
For optimal make-up air system performance, the sensing probe should be installed in the exhaust ductwork or in an area where it can accurately detect the pressure differential between the conditioned space and the outdoors or the exhaust stream.

Can this damper be used with a kitchen range hood?
Yes, this 8-inch make-up air kit is specifically designed to meet building code requirements for range hoods exceeding 400 CFM, providing the necessary outdoor air to balance the exhaust volume.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.