Widely Used – The 4-inch inline duct fan is suitable for use in homes, offices, warehouses, restaurants, shops, shopping malls, grow tents, greenhouses, and other spaces where ventilation is needed. Overheat Protection – The motor operates at a low temperature with minimal heat generation. An integrated thermal protection device disconnects the circuit if the motor overheats, providing safety against failure. Airflow Performance – Designed with a high-quality sleeve motor, this fan is quiet and energy efficient, offering a rotational speed of 2800 r/min and an airflow of 140 CFM. DIY HVAC System – You can install one or more fans to create a customized air circulation system based on your space requirements. It effectively moves air through carbon filters, long duct runs, or grow light reflectors. Helps exchange stale air with fresh air to maintain optimal temperature and humidity levels, and can cool reflectors using the blower. Safe and Environmentally Friendly – Non-insulated flex aluminum ducting provides reliable HVAC ventilation. Integrated steel wire reinforces the ducting for durability and long-lasting performance. Specifications: Voltage: 220V 50Hz Input Power: 25W Speed: 2800 RPM Air Volume: 140 m³/H Noise Level: 30–35 dB Fan Size: Diameter: 93 mm; Height: 78 mm Ducting Length: 1M Color: Black Material: Metal Package Contents: 1 x Duct Fan 1 x Aluminum Ducting 2 x Clamps Note: Only the items listed above are included. Other products are not included. Lighting and display differences may cause slight color variations between the image and the actual item. Measurement allows an error of +/- 1–3 cm.