fresh air system is an independent air handling system consisting of air supply system and exhaust system, which can be divided into two types: ducted fresh air system and ductless fresh air system. The ducted fresh air system consists of a new fan and duct fittings. The outdoor air purified by the new fan is introduced into the room, and the indoor air is discharged through the duct. The ductless fresh air system consists of fresh air fans. Westbank > the outdoor air purified by the fresh air blower and introduced into the indoor fresh air system also belongs to the 11th category of lamp air conditioner

116- air conditioning equipment. P>116: fume hood

11233: When the ventilation equipment and devices (air conditioning) are branded in all or multiple categories, the relevant enterprises should choose the correct trademark category according to the specific goods or services sold.