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2. Duct leakage testing - Wikipedia

   en.wikipedia.org/wiki/Duct_leakage_testing

   A third test method to determine if ductwork is leaking to the outside is to use a pressure pan, which is a register cover with a pressure tap for a hose connection. With the house pressurized (or depressurized) to 50 Pa (-50 Pa) using a blower door, a pressure gauge is attached to the pressure pan by means of a hose.

3. Pressure measurement - Wikipedia

   en.wikipedia.org/wiki/Pressure_measurement

   A vented-gauge pressure transmitter, for example, allows the outside air pressure to be exposed to the negative side of the pressure-sensing diaphragm, through a vented cable or a hole on the side of the device, so that it always measures the pressure referred to ambient barometric pressure.

4. Leak-down tester - Wikipedia

   en.wikipedia.org/wiki/Leak-down_tester

   Gauge meter faces can be numbered 0-100 or 100-0, indicating either 0% at full pressure or 100% at full pressure. There is no standard regarding the size of the restriction orifice for non-aviation use and that is what leads to differences in readings between leak-down testers generally available from different manufacturers.

5. Air line - Wikipedia

   en.wikipedia.org/wiki/Air_line

   The compressed air lines will be piped from the compressor to one or multiple point of use outlets. At the outlet of a fixed air line you will typically find a Pressure regulator installed upstream of the termination/outlet point, this allows the user to regulate the pressure and flow of air to suit the desired use. The regulator allows each ...

6. Inch of mercury - Wikipedia

   en.wikipedia.org/wiki/Inch_of_mercury

   Inch of mercury (inHg and ″Hg) is a non-SI unit of measurement for pressure. It is used for barometric pressure in weather reports, refrigeration and aviation in the United States. It is the pressure exerted by a column of mercury 1 inch (25.4 mm) in height at the standard acceleration of gravity.

7. Heating, ventilation, and air conditioning - Wikipedia

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

   Then the mixture air enters an indoor or outdoor heat exchanger section where the air is to be cooled down, then be guided to the space creating positive air pressure. The percentage of return air made up of fresh air can usually be manipulated by adjusting the opening of this vent. Typical fresh air intake is about 10% of the total supply air ...