First of all in the production process at the same time, not according to the customer’s order requirements to do, is a deception, more serious is the impact of the entire ventilation system air volume, is also a direct cause of return. Medium efficiency PP material is required for large air flow, low resistance of the intermediate filter, and efficient HV-type filter in the same filtering effect and air volume, the resistance is equivalent to the effect of PP material filter 3 times the resistance, air volume (wind speed) Less than the customer’s request.
