The exhaust fan can be either a rooftop device or a fan box. The electric motor, which can be EC or frequency-controlled, is always separated from the airflow. Several kitchen hoods can share one fan or every hood can have its own fan. A damper with the motor drive has to be built in with the fan. A silencer can be added if needed.
Supply ventilation device
This device is used to supply air into the energy-saving hoods with inbuilt plate heat exchangers. It can be internal or external. A damper with the motor drive, M5 pre-filter, F7 main filter and a glycol register or a register for the direct expansion of the refrigerant gas are always built in with the fan. A silencer can be added if needed.
Supply and extraction ventilation device
A supply and extraction ventilation device is always combined with plate heat exchangers. It is used in larger kitchens to supply and extract the air above thermal elements where there is no grease or other particles (dishwashing, the baking of bread and desserts …) and to ventilate other areas with special technologies.