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2. Positive pressure - Wikipedia

   en.wikipedia.org/wiki/Positive_pressure

   Positive pressure is a pressure within a system that is greater than the environment that surrounds that system. Consequently, if there is any leak from the positively pressured system, it will egress into the surrounding environment. This is in contrast to a negative pressure room, where air is sucked in. [1] [2]

3. Stack effect - Wikipedia

   en.wikipedia.org/wiki/Stack_effect

   This presents a situation where floors underneath the neutral axis of the building have a net negative pressure, whereas floors above the neutral axis have a net positive pressure. The net negative pressure on lower floors can induce outdoor air to infiltrate the building through doors, windows, or ductwork without backdraft dampers.

4. Negative room pressure - Wikipedia

   en.wikipedia.org/wiki/Negative_room_pressure

   Schematic of a network of rooms where air (shown in blue) flows in one direction from the corridor into the negative pressure room (green). Exhaust air is safely removed from the area through a ventilation system. Negative pressure is generated and maintained in a room by a ventilation system that continually attempts to move air out of the ...

5. Heating, ventilation, and air conditioning - Wikipedia

   en.wikipedia.org/wiki/Heating,_ventilation,_and...

   HVAC systems can be used in both domestic and commercial environments. HVAC systems can provide ventilation, and maintain pressure relationships between spaces. The means of air delivery and removal from spaces is known as room air distribution. [2]

6. HVAC: REPLACEMENT VS. REPAIR - AOL

   www.aol.com/news/2008-08-15-hvac-replacement-vs...

   When and how to invest in your heating, ventilation and air conditioning system. The time to consider upgrades and repairs for your home s heating and cooling systems is before you need the ...

7. Air changes per hour - Wikipedia

   en.wikipedia.org/wiki/Air_changes_per_hour

   The presence of forced ventilation systems has been shown in some cases to actually increase the humidity rather than lower it. [15] By displacing air inside a dwelling with infiltrated air (air brought in from outside the dwelling), positive pressure ventilation systems can increase heating (in winter) or cooling (in summer) requirements in a ...