Grow Room Ventilation Exhaust Duct Fan 4′ 6′ 8′ HVAC Exhausting Inline Fans for Hydroponics. Low Noise Operation: Avg noise level ranges from 26 to 39dB(A) at 3 meters for quiet performance. Two-Speed Control: Features high and low speed settings for adjustable airflow and pressure. Durable Construction: Made of fire-retardant ABS, stainless steel rotor, and pure copper wire stator. Easy Maintenance: Removable central cartridge and detachable body allow for simple cleaning. Versatile Application: Ideal for bathrooms, kitchens, offices, and hydroponics with high humidity. Lifetime Spare Parts: All spare parts are available for the lifetime use of the product. Certified Quality: CE certified with IP44/IP56 protection rating for safety and reliability. Compact Design: Small size and light weight (2kg) allow installation in narrow spaces.