4-Inch Inline Duct Fan, 205 CFM, Temp Humidity Controller

4 inch inline duct fan boosts airflow to remove heat and humidity fast for cleaner, more stable indoor air. Designed for grow tent ventilation, hydroponics rooms, basements, kitchens, and equipment spaces, it pairs a quiet EC motor with a temperature and humidity controller for hands-off start/stop control. Compact, efficient, and easy to mount or hang, it’s built for continuous exhaust and ventilation where noise matters.

• Delivers up to 205 CFM airflow to ventilate wide areas and support dehumidification


• Runs quietly with low noise operation (about 28 dB) for workspaces and living areas


• Controls automatically via temp/humidity controller with ON/OFF/TIMER/AUTO modes and alarm


• Includes hang-up slings, anti-vibration rubber mats, and straps for faster installation


• Fits 4 in ducting and allows wall-mounting or hanging to suit tight indoor setups

Use this inline exhaust fan to stabilize temperature and humidity swings that can stress plants, equipment, and stored items. The controller can start or stop the fan based on your set high/low temperature or humidity thresholds, helping you maintain consistent ventilation without constant checking. Speed is adjusted manually when needed, while the system handles automatic operation and alerts. Set it up once, fine-tune your environment, and keep fresh air moving—grab yours today.

• Duct size: 4 in (102 mm)


• Airflow: up to 205 CFM


• Noise level: ≤ 50 dB (about 28 dB)


• Air pressure: 200 Pa


• Rated power: 21 W


• Fan speed: 2900 RPM


• Voltage/Frequency: AC 110–240 V, 50/60 Hz


• Motor: EC copper motor


• Size (L×W×H): 11.8 × 9.2 × 7.1 in (300 × 235 × 182 mm)


• Weight: 4.3 lb (1.94 kg)