Fresh air system duct design principles:
One: Define the fresh air path—new winds enter from the cleaner areas of the air and are discharged from the dirty places.
Second: to ensure the minimum amount of fresh air in the house - to meet the daily fresh air volume required for people to rest, according to the "Indoor Air Quality Standards" (GB/T18883-2002): 30 cubic meters per person must be guaranteed.
Three: Define the fresh air time - to ensure the continuity of the new wind, 365 days a year, 24 hours continuous uninterrupted ventilation.
Four: maximize the air circulation - reasonable design of the tuyere position, so that the room air is fully circulated.