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NACE:
National
Association
of
Corrosion
Engineers.
NAPPED:
The
rupturing
of
the
filling
yarns
to
produce
a
fleecy
surface
on
woven
fabrics.
NATURAL
FREQUENCY:
The
frequency
at
which
a
component
or
system
resonates.
NEC:
National
Electrical
Code.
NEEDLED
FELT:
A
felt
made
by
the
placement
of
loose
fiber
in
systematic
alignment
with
barbed
needles.
The
needles
move
up
and
down,
pushing
and
pulling
fibers
to
form
an
interlocking
of
adjacent
fibers.
It
is
the
most
commonly
used
construction
method
since
it
is
stronger
than
pressed
felt.
NEDS:
National
Emission
Data
System.
NEMA
(The
National
Electrical
Manufacturers
Association):
The
trade
association
establishing
standards
of
dimensions,
ratings,
enclosures,
insulation
and
other
design
criteria
for
electric
motors.
NESHAP:
National
Emissions
Standards
for
Hazardous
Air
Pollutants.
NEW
SOURCE:
A
stationary
source;
the
construction
or
reconstruction
of
which
is
commenced
after
the
proposal
date
of
the
standard.
Also
NSPS
(New
Source
Performance
Standard).
NFPA:
National
Fire
Protection
Agency.
NIOSH
(NATIONAL
INSTITUTE
FOR
OCCUPATIONAL
SAFETY
AND
HEALTH):
Created
by
the
Occupational
Safety
and
Health
Act
of
1970,
NIOSH
is
part
of
the
Centers
for
Disease
Control
under
the
Department
of
Health
and
Human
Services.
Its
mandate
includes
conducting
research
in
developing
criteria
and/or
recommendations
to
be
used
in
setting
occupational
exposure
standards,
identifying
and
evaluating
workplace
hazards,
measurement
techniques
and
control
technologies,
and
providing
professional
education
as
well
as
health
and
safety
information.
NOISE
CRITERIA:
A
way
for
an
architect
to
specify
the
maximum
permissible
sound
power
level
in
each
of
the
eight
octave
bands
NC
curves
give.
In
a
graphical
form,
maximum
permissible
intensity
per
octave
band.
NON-ATTAINMENT
AREA:
An
area
that
has
not
achieved
air
quality
as
good
as
the
National
Ambient
Air
Quality
Standards
as
defined
by
the
CAAA.
NON-WOVEN
FELT:
A
felt
made
by
either
needling,
matting
of
fibers
or
compressed
with
a
bonding
agent
for
permanency.
NOX
(NITROGEN
OXIDES):
Chemical
compounds
containing
nitrogen
and
oxygen.
Reacts
with
volatile
organic
compounds
in
the
presence
of
heat
and
sunlight
to
form
ozone.
It
is
also
a
major
precursor
to
acid
rain.
Nationwide,
approximately
45%
of
Nox
emissions
come
from
mobile
sources,
35%
from
electric
utilities,
and
15%
from
industrial
fuel
combustion.
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