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ULPA
FILTER:
Ultra
Low
Penetration
Air
Filter
designed
to
be
99.997%
efficient
on
0.3
micron
particles
when
clean.
UNBALANCE:
The
condition
of
a
rotor
in
which
its
rotation
results
in
centrifugal
force
being
applied
to
the
rotor’s
supporting
bearings.
UNDUCTED:
System
consisting
of
one
or
more
air
cleaners
positioned
in
the
overhead
space
to
create
a
planned
air
circulation
pattern.
This
method
effectively
cleans
the
overall
ambient
plant
air.
Unducted
systems
rely
upon
constant
cleaning
and
mixing
of
the
entire
room
volume
to
remove
airborne
contaminants.
Unducted
systems
never
remove
100%
of
the
contaminants.
The
objective
of
this
method
is
to
achieve
a
substantial
reduction
in
steady-state
contaminant
concentration.
UNICELL:
Combination
of
an
ionizer
and
collection
cell
in
a
single
assembly
in
a
SMOG-HOG
electrostatic
precipitator.
UNIFORM
FLOW:
Airflow
in
which
velocities
between
any
two
given
points
remain
fairly
constant.
UPPER
EXPLOSIVE
LIMIT:
The
upper
limit
of
flammability
or
combustibility
of
a
gas
or
vapor
expressed
in
percent
of
gas
or
vapor,
in
air,
by
volume.
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