The core of a tunnel fan is its high energy efficiency ratio(airflow per watt).Its aerodynamically optimized aluminum or composite blades are lightweight with low inertia for quick starts and smooth operation.Efficient airfoil shapes maximize airflow while minimizing noise.The robust galvanized steel housing offers corrosion resistance in harsh,ammonia-rich,and dusty environments.High-quality,waterproof motors and permanently lubricated bearings ensure reliable,continuous operation in hot,humid conditions.Some models feature automatic shutters to prevent backdraft when off.
A standard 54-inch(≈1.37m)fan typically delivers over 36,000 CFM at 0.05"static pressure with a≈1.5 kW motor.Blade pitch is often adjustable for fine-tuning airflow and power use.The housing seals to the wall via a flange to prevent air leakage.Fans are installed on the end wall of a building,working with air inlets on the opposite wall to create a longitudinal flow.Noise level is a key metric,with quality fans operating below 65 dB.
Widely used for summer cooling in enclosed layer,broiler,breeder houses,and finishing pig barns.When the outside temperature exceeds a set point,the ventilation system switches to tunnel mode:all end-wall fans operate at full capacity,side curtains close,and evaporative cooling pad inlets open.The powerful negative pressure draws air through the pads,cooling it before it flows at high speed over the animals,providing a wind-chill effect to alleviate heat stress.Correctly calculating the total required fan capacity(typically aiming for a cross-sectional air speed of 2-3 m/s in poultry houses)is critical for effective cooling.It is a vital component of modern environmental control.
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