... ventilation, air conditioner, heat exchangers, in-line duct blowers, range hood, fire place inserts, humidifiers, dehumidifiers, hand dryers.2. The Brief ... : Coated in black—Direction of rotation: Clockwise, seen on rotor—Type of protection: IP54 or IP44—Insulation class: B or F ... installation5. air volume and static pressure curve dual inlet forward curved centrifugal fan for range hood