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Except for this gap, the room is as airtight as possible, allowing little air in through cracks and gaps, such as those around windows, light fixtures and electrical outlets. Leakage from these sources can make it more difficult and less energy efficient to maintain room negative pressure. [1]
Displacement ventilation systems supply air directly to the occupied zone.The air is supplied at low velocities to cause minimal induction and mixing. This system is used for ventilation and cooling of large high spaces, such as auditorium and atria, where energy may be saved if only the occupied zone is treated rather than trying to control the conditions in the entire space.
Displacement ventilation is best suited for taller spaces (higher than 3 meters [10 feet]). [2] Standard mixing ventilation may be better suited for smaller spaces where air quality is not as great a concern, such as single-occupant offices, and where the room height is not tall (e.g., lower than 2.3 meters [7.5 feet]).
= Buoyancy-driven ventilation airflow rate, ft 3 /s A = cross-sectional area of opening, ft² (assumes equal area for inlet and outlet) C d = Discharge coefficient for opening (typical value is 0.65) g = gravitational acceleration, around 32.2 ft/s² on Earth H d = Height from midpoint of lower opening to midpoint of upper opening, ft T I
Rooftop HVAC unit with view of fresh-air intake vent Ventilation duct with outlet diffuser vent. These are installed throughout a building to move air in or out of rooms. In the middle is a damper to open and close the vent to allow more or less air to enter the space. The control circuit in a household HVAC installation.
Although dining nooks or booths in the corner of a room can work well for smaller spaces, it often makes most sense to enhance the flow of a space by allowing for more room around the table.