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Honeywell 80363969-150 Analog Output Module
PRESSURE CHANGES WITHIN A DUCT
For air to flow within a duct, a pressure difference must exist. The fan must overcome friction losses and dynamic (turbulent) losses to create the necessary pressure difference. Friction losses occur due to air rubbing against duct surfaces. Dynamic losses occur whenever airflow changes velocity or direction. The pressure difference (also called pressure head) required to move air must be sufficient to overcome these losses and to accelerate the air from a state of rest to a required velocity.
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PRESSURIZATION
Building pressurization and ventilation are important aspects of airflow control. A building or areas within a building can be pressurized for positive, negative, or sometimes neutral static pressure to control the flow of air from one area to another. A building can use positive static pressure to eliminate infiltration drafts, possible dirt, and contamination from outside sources. Areas within a building such as laboratories can use negative pressure to prevent contamination and exfiltration to adjacent spaces and zones. Proper building pressurization must also consider the effects of outdoor wind pressure and stack effect or vertical air differences.
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