Need to move some serious air quietly and efficiently? The YOZON 6-inch inline fan is a powerhouse. It uses a modern, energy-efficient EC motor that moves up to 420 cubic feet of air per minute (CFM) while running super quietly – as low as 30dB, which is like a whisper. It only uses about 45 watts of power. The best part is the included PWM speed controller with a long cable; you can dial the fan speed anywhere from 30% to 100% to get the exact airflow you need. It's built tough with a metal base and corrosion-resistant ABS housing. It's perfect for ventilating grow tents, hydroponic rooms, drying rooms, workshops, attics, or boosting weak airflow in your home's HVAC ducts. It comes with stainless steel hose clamps and mounting hardware for easy installation into standard 6-inch flexible or rigid ducting. A reliable, versatile, and quiet solution for any ventilation challenge. Get your air moving the right way!