Inline Duct fans and Tube Axial Duct fans are the appropriate choice where space is at a premium. The duct fan can be used for either exhaust air or supply air depending on what is required. Applications for duct fans include: enclosed garages, spray booths (explosion proof fans are typically used), heat & smoke ventilation, or in any space where air is moved through ducting. Square Inline Duct fans can be used where space is limited. Multi-Purpose Duct fan applications include: bathrooms, kitchen range hoods, utility rooms, cafeterias, offices, welding fume extraction, equipment cooling, workshops and smoking areas. Industrial Fans Direct carries the right duct type fan for most commercial and industrial applications.