Feature: 1. High Capacity Output: Ventilation blower fan is designed with a high speed, high capacity output, copper winding motor that can move large amounts of air quickly. 2. Work Efficiently: Portable ventilation fan extracts large amounts of air and keeps working efficiently. 2 high density housings ensure continuous and safe operation. 3. Dual Speed Mode: Ventilation blower fan has dual speed mode with low speed and high speed replacement and powerful motor. 4. Use Scenario: Ventilation blower fan can be used as a smoke evacuator for home and workplace exhaust and ventilation. 5. Adjustable Rope: The blower fan's thick rope can be adjusted according to the size of the air duct opening to ensure a good sealing environment and smooth running process. Specification: Item Type: Portable Ventilation Fan Specifications: 12 Inches, Fan, 5 Meters Long Hose, 10 Meters Long Hose, 2 Clamps Material: Steel, PVC Connection Size: 12in Rotation Speed: 2900 Or 3300 R/Min. Package List: 1 x Blower Fan1 x 5m Long Hose1 x 10m Long Hose2 x Clamp