Suncourt’s ZCMU Make-Up Air Intake Kit is an optimized solution for automatically balancing the air pressure in spaces when paired with high-capacity exhaust fans. By introducing measured outdoor air whenever a range hood or similar appliance starts, the kit helps avoid negative pressure and backdrafting in kitchens, workshops, and other mechanically ventilated spaces.

This air intake kit is offered in multiple sizes to easily balance the exhausted air in your home, activating automatically and closing tightly when the exhaust fan stops.

Key Features and Benefits of the Suncourt ZCMU Make-Up Air Intake Kit

Fan Interlock: The UL-listed current switch senses amperage draw and opens the damper only when the exhaust fan runs, giving you hands-free operation and dependable pressure balance.
Normally Closed Damper: A two-wire hysteresis gear motor drives the normally closed damper blade open; loss of power triggers an internal spring to close it.
Patented Adjustable Coupler: Set the blade anywhere from 0 to 90 degrees open to fine-tune airflow for different hood capacities, ensuring just the right volume of make-up air.
Multiple Duct Diameters: Choose 4, 5, 6, 8, 10, or 12-inch models to match existing round duct, reducing the need for transitions.
Low Leakage Seal: Closed-cell foam gasket limits air loss to less than 5 percent when shut, helping you preserve heating and cooling energy between exhaust cycles.
Rugged Steel Exterior: The 24-gauge galvanized steel housing and a 20-gauge blade resist corrosion and deformation.
Kit Includes: The Make-Up Air Intake Kit includes the motorized damper, a 24 V transformer, and a current switch.
UL Safety Listings: The damper motor, transformer, and current switch all carry independent UL ratings.

Code-Ready Ventilation

Many jurisdictions now mandate dedicated make-up air for kitchen range hoods rated at 400 cubic feet per minute and higher. Negative pressure caused by large exhaust volumes can back-draft gas appliances, chimneys, and appliance vents. This Suncourt kit offers an automatic solution: it opens when the hood turns on, introduces outdoor air through ducting, and shuts tight once the exhaust fan is shut off. Because the control circuit ties directly to the fan’s electrical load, there is no need for separate pressure sensors or wall switches.

Pair with inline filter boxes for intake air filtration.

Sylvane’s Expert Take

If you need a reliable way to supply make-up air for high-capacity exhaust fans, the Suncourt ZCMU Make-Up Air Intake Kit checks every box. It ships as a complete fan with six optional sizes, installs easily, and maintains an impressively low leakage rate when closed. Overall, it is a practical, code-compliant solution that keeps indoor pressure stable and your ventilation system running as intended.