Hon&Guan 4 Inch Inline Booster Duct Fan with 4 to 3 Inch Duct Reducer

APPROPRIATE SIZE : On one side there is a 99mm Female Spigot（inner：97mm） - Will fit into 4'' dust collection hose/4 inch fan. On the other side there is a 73mm(inner：71mm) Male Spigot - Will fit into 3 inch duct/exhaust fan., DURABLE MATERIAL : 4 inch to 3 inch duct reducer made of galvanized steel, which is stronger and more resistant to high temperatures than ordinary plastic or pvc duct reducer, and is suitable for dryer vent environments., WIDELY APPLICATION : 4in to 3in duct reducer designed for widely used, such as air-cooled hoods, garage, attic, bathroom kitchen extractor fan, hydroponics and HVAC ventilation systems, plastic rigid ducting is perfect for DIY and trade use., Energy-Efficient Ventilation This powerful inline duct fan speed of 4500 RPM can create the air flow of 130 CFM, Maximum power consumption is only 6W. Upgrade DC motor & low noise effectively circulating air, quickly move vast amount of air to exhaust odors., Application Scenarios The 4 inch booster duct fan designed to quietly ventilate grow rooms, bathrooms, kitchens, workshops, basements, attics and etc, in order to boost airflow in HVAC systems.