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What is the best way to model infliltration in a building?

There are numerous papers and methods out there that include "flow per exterior area", "flow per exterior wall area", "air changes per hour", etc. There are also different recommended schedules with different fractions of maximum flow rate for when the supply fans are on/off. How do you know the best way to model infiltration in your building?

What is the best way to model infliltration in a building?

There are numerous papers and methods out there that include "flow per exterior area", "flow per exterior wall area", "air changes per hour", etc. There are also different recommended schedules with different fractions of maximum flow rate for when the supply fans are on/off. How do you know the best way to model infiltration in your building?