What are the modes of fiber fabric bag air duct?

Pure Penetration Mode All air flow is permeated from the surface of the fiber fabric and sent to the ventilation area. The wind speed of this mode is about 0.05~0.25m/s; it is characterized by low wind speed, uniform airflow and small temperature gradient. It is mostly used in cold storage, fruit refrigeration workshop, electronic workshop and other places. High Humidity Mode A supply air mode in which the air volume is delivered by a long grid to the ventilated area. The wind speed of this mode is about 0.9~2.5m/s; it is characterized by low wind speed, specific wind direction and uniform airflow. It is mostly used in places such as swimming pools with anti-condensation design. The uniform air supply mode is the air supply mode in which the air volume is delivered to the ventilation area by multiple rows of orifices. The wind speed of this mode is about 7~13m/s; the characteristic is that the diameter of the orifice is small and the same (the diameter is below φ30mm), and the air flow is uniform when the number is large. It is mostly used in places with large air volume, small space and high ventilation times, such as greenhouses. The flat air supply mode is the air outlet mode in which the air volume is delivered to the ventilation area by rows of orifices. The wind speed of this mode is about 7~13m/s; the characteristic is that the orifices are neatly designed in rows, the diameter of the orifices in a single row is the same, the air supply coverage is wide, and the air flow is uniform. Mostly used in shopping malls, supermarkets, workshop production, food workshops, logistics warehousing, etc.