Description Compact But Efficient: This duct fan is compact and lightweight enough to be installed in areas with little available space; With a diameter of 4 inches, speed of 2930 RPM and 100 CFM air flow Low Noise: Superior balanced centrifugal impeller for long service life & quiet operation; A less than 30 dB noise level does not have any harm and will not disturb your work Specifications: Voltage 110/120V, Power 14W; Max Operating Temp of Motor is 130℃ / 266℉; Max Ambient Temp is 60℃ / 140℉; Note: Please turn the fan off immediately if the blades get stuck by other objects Perfect Connector: The VIVOSUN ducting is primarily used with duct fan systems in various air circulation and ventilation projects to move and transport air, increasing airflow and easing connections between spaces; It's compatible with front-mounted and top-loading dryers/fans Multi-Layer Protection: It features 3-layer protection, making it more durable and resistant to leaks than single-layer ones; The internal and outer layers are made of heavy-duty aluminum foil that is fire/flame-retardant; Its middle layer adopts PET thermoplastic that protects the ducting from cuts and tears, all while stopping leakage 4 Inch Inline Duct Fan with 4 Inch 8 Feet Ducting