Wall Mounted Cylinder Pipe Fan could save more space, and it could installed widely, such like interior of ventilation duct to strengthen ventilated. A: Power 250W, speed 2800r/min, air volume 5800m³/h. B: Power 350W, speed 2800r/min, air volume 7800m³/h. C: Power 550W, speed 2800r/min, air volume 8800m³/h. D: Power 900W, speed 2800r/min, air volume 13500m³/h Good sealing and durable; Large angle stainless steel blades, exquisite workmanship and appearance. Fit long time ventilation work, low noise. Reliable and built to last High output fans designed with strong suction. Two durable grills bring the fan's continuous working safely and cleanly. Axial explosion proof fan is highly versatile with high performance, super ideal for air exhausting in factories, warehouse, kitchen, office, workshops, laboratories, etc. This type of ventilation fan can be widely used in bathrooms, kitchens, offices and other areas that require continuous or regular ventilation.