Commercial Products  > Commercial Systems
Building Exhaust System SV
Clean Air. Quietly.

An extremely good option for retrofitting, the ENERVEX Modulating Building Exhaust System™ (MBESV) is a demand-controlled ventilation system designed for multi-story buildings that have kitchen hoods, bathrooms or clothes dryers on multiple floors.

Rather than operating at full speed 24/7, the MBESV senses when no appliances are running and kicks into a very low speed. Once the appliance starts, the internal appliance fan creates pressure inside the duct, causing the fan to speed up.

  • Automatically controls fan speed based on current demand
  • Costs less to operate than a fixed-speed CAV system Extremely suitable for retrofitting
  • Rugged EFV exhaust fan with vertical discharge allows maximum flexibility
  • Discharges on the roof, making it easier to clean architectural vents
  • Quiet performance eliminates constant fan noise & noise from speed variations
  • Ability to combine ducts & reduce duct sizes cuts material & labor costs
  • Variable speed, direct-drive fans eliminate broken belts
  • 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.

MBESV Building Exhaust System SV—demand-controlled ventilation system with box fan and rooftop fan
BEF Box Fan—high-efficiency ventilator designed to reduce noise and condensation in intake and exhaust appliances
Box Fans

Multi-use centrifugal exhaust fan designed for indoor and outdoor installation. Can be used for special exhaust or exhaust of lint-laden air. Also used to supply air.

EFV Rooftop Fan—multi-use centrifugal exhaust fan used for dryer/building exhaust
Rooftop Fan

Multi-use centrifugal exhaust fan designed for outdoor termination installation. Can be used for special exhaust or exhaust of lint-laden air.