and to capture contaminated air at that point to cause it to flow
into the hood.
b.
Capture zone: Controlled space around an industrial process that
provides a safe and healthy workspace.
c.
Equilibrium performance point: The operating condition after
sufficient start-up time that an air pollution control device
reaches optimum efficiency. The manufacturer recommends the
minimum start-up time for each device.
d.
Facility: A building or portion of a building in which
contaminated air is controlled by the industrial ventilation
system. This includes the shop space, equipment room, offices,
restrooms and locker rooms affected by the industrial process.
e.
Full load condition: Condition in the facility where exhaust and
replacement air systems operate simultaneously, as installed by
the Contractor according to the design plans and specifications.
f.
Heating and cooling equipment: Equipment used to temper air in
the facility. Equipment includes, but is not limited to:
condensers, chillers, pumps, heat exchangers, heating and cooling
coils, heat pumps, cooling towers, and duct heaters.
g.
Hood static pressure: Static pressure, in Pascals (Pa) inches of
water gage (wg), taken at 3 duct diameters from a flanged or plain
hood or 1 duct diameter from a tapered hood.
h.
Manometer: An instrument for measuring pressure. Electronic or
U-tube manometers with water or light oil are acceptable.
i.
Replacement air system: The mechanical system supplying air to a
facility to replace exhausted air.
j.
Standard Temperature and Pressure: Air at standard conditions of
21.1 degrees Celcius and 101.3 kilopascals 70 degrees Fahrenheit
and 1 atmosphere.
k.
Static Pressure: The potential pressure exerted in all directions
by a fluid at rest. For a fluid in motion, it is measured in a
direction normal to the direction of flow. Usually expressed in Pa
inches of wg.
l.
System Effect: The estimated loss in fan performance from
non-uniform air flow at the fan's inlet or outlet.
m.
Test agency: A first tier subcontractor who is independent from
the Contractor and the mechanical Sub-contractor except by the
affiliation established by this contract.
n.
Transport velocity: Minimum air velocity, in meter per second
(m/s) feet per minute (fpm), required to prevent contaminants from
settling, condensing, or pocketing in the ductwork.
o.
Velocity pressure: The kinetic pressure in the direction of flow
necessary to cause a fluid at rest to flow at a given velocity.
Usually expressed in Pa inches of wg.
SECTION 15951N
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