• Costs 55% less to operate than a fixed-speed CAV system
• Saves up to 85% of the cost of exhausted conditioned air
• Unused air can save $500 per kitchen hood & $200 per bathroom annually

The MBESV system consists of a EFV Roof Top Exhaust Fan and an MEC 24 Constant Pressure Controller with an XTP Pressure Transducer. For systems 1HP or large, it uses an MSC EDrive Motor Speed Controller.

The MEC 24 control modulates the speed of the EFV fan based on the ventilation demands of the building to maintain the set-point during normal operation. The MBES ensures the set-point is reached within 30 seconds of system start-up and is maintained with a tolerance of 0.01” W.C.

When a number of clothes dryer, kitchen or bathroom exhausts are connected into a common duct, the MBES will modulate with the load. Once an appliance starts up, the pressure will change in the common duct and the MBES will react by increasing speed and vice versa.

During normal operation, ramp-up and ramp-down time of the fan will be no more than 20 seconds. In the case of a mechanical or electrical failure, the control goes into alarm and sets the ventilator to run at 100% speed. If connected, the alarm signal will be sent to the Building Management System.