4-Inch Inline Duct Fan: Small Vent Fan Fit 4" Duct

Widely Used -- The 4 inch inline fan is widely used in homes, offices, warehouses, restaurants, bars, shops, shopping malls, grow tents, greenhouses and other places where a lot of air is needed | Large Airflow -- It is designed with high quality sleeve motor, quiet and service life more than 3 years, with rotational speed 2400 r/min, 76 CFM large airflow | Over-heat Protection >> The motor comes with low operating temperature and low heat generation, the built-in temperature protection device, the contact point is disconnected when the motor overheats, which acts as a power failure protection. double protection is safer | DIY Your HVAC System >> You can supply fresh air with one or more fans to DIY air circulation systems depending on the size of your space | Easy to install >> only connect it with 4" ventilation pipe, 39" cable, brown live wire, blue neutral wire, easy to install, please fix the fan to avoid noise due to looseness