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HALLOS:
A
family
of
compounds
containing
bromine,
fluorine,
iodine
and
chlorine
used
in
fighting
fires
that
breakdown
in
the
atmosphere
depleting
stratospheric
ozone.
HAPs
(HAZARDOUS
AIR
POLLUTANTS):
Any
of
the
189
chemicals
listed
under
Title
III
of
the
CAAA.
All
HAP
sources
will
have
to
comply
with
GACT
or
MACT
standards.
HCFCs:
Chlorofluorocarbons
that
have
been
chemically
altered
by
the
addition
of
hydrogen
and
which
are
significantly
less
damaging
to
stratospheric
ozone
than
other
CFCs.
HEADER:
As
applied
to
pulse-jet
baghouses,
the
pressurized
pipe
that
contains
the
compressed
air
supply
for
pulsing.
If
it
is
undersized,
insufficient
cleaning
air
will
flow
through
the
valve.
HEAT
EXCHANGER:
A
device
such
as
a
coil
or
radiator
that
is
used
to
transfer
heat
between
two
physically
separate
fluids.
HEPA
FILTER
(HIGH
EFFICIENCY
PARTICULATE
AIR
FILTER):
Capable
of
removing
at
least
99.97%
by
count
of
a
standard
0.3
micron
challenge
particulate
(DOP
test).
HERTZ:
Frequency
measured
in
cycles
per
second.
HG:
Symbol
for
mercury.
Pressure
is
often
measured
in
inches
of
mercury:
(1”
Hg=13.64”
WG).
HIGH
PRESSURE
CLEANING
AIR:
Air
at
80-100
PSIG
used
for
cleaning
air
in
baghouses
and
cartridge
filters.
HI-VOLUME
SAMPLER:
Also
called
a
Hi-Vol.
A
device
used
in
the
measurement
and
analysis
of
suspended
particulate
pollution.
HON:
Hazardous
Organic
NESHAPS.
HOOD:
A
shaped
inlet
designed
to
capture
contaminated
air
and
transport
it
into
the
exhaust
duct
system.
Hood
types
include
canopy,
side
draft,
slotted,
downdraft,
etc.
HORIZONTAL
CARTRIDGE
UNIT:
A
cartridge-type
dust
collector
where
the
filters
are
in
a
horizontal
configuration
and
the
contaminated
air
typically
enters
the
top
of
the
unit
and
moves
in
a
downward
direction.
HORSEPOWER:
(As
applied
to
motors)
is
an
index
of
the
amount
of
work
the
machine
can
perform
in
a
period
of
time.
One
HP
equals
33,000
ft.
lbs.
of
work
per
minute,
also
equal
to
0.746
kilowatts.
Horsepower
can
be
calculated
by:
HP
=
Torque
(ft.
lbs.)
x
RPM
5,250
HUMIDITY:
Measure
of
the
amount
of
water
vapor
in
air.
HUMIDITY,
ABSOLUTE:
The
weight
of
water
vapor
per
unit
volume,
pounds
per
cubic
foot
or
grams
per
cubic
centimeter.
HUMIDITY,
RELATIVE:
The
ration
of
the
actual
partial
pressure
of
water
vapor
in
a
space,
to
the
saturated
pressure
of
pure
water
vapor
in
a
space,
to
the
saturated
pressure
of
pure
water
at
the
same
temperature.
HVAC:
Heating,
ventilating
and
air
conditioning.
HYDROCARBON:
Any
of
the
vast
family
of
compounds
containing
carbon
and
hydrogen
in
various
combinations;
found
especially
in
fossil
fuels.
Some
of
the
hydrocarbon
compounds
are
major
air
pollutants;
they
may
be
carcinogenic
or
active
participants
in
the
photochemical
smog
process.
HYDROPHOBIC
FIBERS:
Those
fibers
or
materials
not
readily
water
absorbent.
HYDRO-WASH:
UAS’
proprietary,
in-place
cleaning
system
associated
with
SMOGHOG
SG
Series
electrostatic
precipitator
systems.
Consists
of
traversing
face
and
overhead
cleaning
nozzles
and
associated
detergent
injection
equipment.
HYGROSCOPIC:
Materials
having
an
affinity
for
water.
HYGROSCOPIC
DUST:
Dry
particles
which
attract
and
retain
moisture,
such
as
cement,
plaster,
cocoa,
etc.
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