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FABRIC:
A
collective
term
applied
to
cloth
no
matter
how
constructed
and
regardless
of
the
kind
of
fiber
used.
FAHRENHEIT:
A
thermometric
scalre
in
which
water
boils
at
212°
and
freezes
at
32°.
°F
=
(1.8
x
°C)
+
32°
FAN:
A
power-driven
machine
that
moves
a
continuous
volume
of
air
by
converting
rotational
mechanical
energy
to
an
increase
in
the
total
pressure
of
the
moving
air.
FAN
CAPACITY:
Performance
requirement
for
which
a
fan
is
selected
to
meet
specific
system
calculations
given
in
terms
of
ACFM
at
the
fan
inlet.
FAN
CLASS:
Operating
limits
at
which
a
fan
must
be
physically
capable
of
operating
safely.
FAN
LAWS:
Theoretical
constant
relationships
between
CFM,
RPM
and
BHP
for
a
given
fan
used
in
a
given
fixed
system:
CFM
varies
as
RPM
SP
varies
as
(RPM)2
BHP
varies
as
(RPM)3
FC:
Fan
wheel
design
using
forward-curved
blades.
FEDERAL
IMPLEMENTATION
PLAN
(FIP):
Under
current
law,
a
lederally
implemented
plan
to
achieve
attainment
of
an
air
quality
standard,
used
when
a
state
is
unable
to
develop
an
adequate
plan.
Under
the
Senate
bill,
a
plan
containing
control
measures
developed
and
promulgated
by
EPA
in
order
to
fill
gaps
in
a
State
Implementation
Plan
(SIP).
FELTED
FABRIC:
Type
bag
used
on
most
pulse
jet
dust
collectors.
Features
a
heavy,
thick
cloth
of
short
fibers
on
a
woven
backing.
FIBER:
The
fundamental
unit
comprising
a
textile
raw
material
such
as
cotton,
wool,
etc.
FILAMENT-MONO:
One
continuous
strand
of
fiber
to
indefinite
length.
FILAMENT-MULTI:
More
than
one
mono-filament
strand
grouped
together
of
definite
length.
FILL:
Crosswise
threads
woven
by
loom.
FILL
COUNT:
Number
of
threads
per
inch
of
cloth.
FILTER
AREA:
Quantity
of
filter
media
available
for
collection
of
contaminants.
Expressed
in
square
feet.
FILTER
CAKE:
The
accumulation
of
dust
on
a
bag
before
cleaning.
This
cake
assists
in
the
filtering
of
dust.
FILTER
COLLECTOR:
A
mechanical
filtration
system
for
removing
particulate
matter
from
a
gas
stream
for
measurement,
analysis
or
control.
Also
called
bag
collector.
Filters
are
designed
in
a
variety
of
sizes
and
materials
for
specific
purposes.
Also
called
bag
collector
or
cartridge.
FINES:
Fine
particulate;
aerosol.
FIRE
RETARDANT:
A
special
treatment
that
results
in
the
filter
media
not
supporting
combustion
unless
a
flame
source
is
present.
FLASHING:
Sheet
metal
strip
placed
at
the
junction
of
intersecting
exterior
building
surfaces
to
make
the
joint
water-tight.
FLEXING:
Bending,
or
contracting
and
expanding.
FLY
ASH:
The
particulate
impurities
resulting
from
burning
coal
or
other
material.
FOG:
The
condensation
of
water
vapor
in
air.
Also
see
Smog.
FOOT-POUND
(ft.-lb.):
Torque
rating
or
requirement;
equivalent
to
the
force
required
to
move
a
one-pound
weight
one
foot
in
distance,
equal
to
12
in.-lb.
FORCED
DRAFT:
How
air
is
provided
in
a
process
such
as
a
combustion
process,
when
air
is
blown
or
forced
into
a
process.
Known
as
a
“forced
draft”
system.
Also
see
Induced
Draft.
FORCED
DRAFT
BURNER:
A
burner
that
has
its
secondary
air
supplied
under
pressure.
This
is
normally
done
by
surrounding
the
dryer
opening
with
a
plenum
or
windbox
and
supplying
the
air
with
a
low-pressure
fan.
FOSSIL
FUELS:
Coal,
oil
and
natural
gas;
so-called
because
they
are
the
remains
of
ancient
plant
and
animal
life.
FPM
(Feet
per
minute):
Commonly
defines
air
velocity
(to
determine
velocity
pressure
or
suitability
for
material
conveying),
shaft-bearing
speeds
(used
to
determine
lubrication
requirements)
and
wheel
tip
speeds.
FRAME
SIZE:
A
set
of
physical
dimensions
of
motors
established
by
National
Electrical
Manufacturers
Association
(NEMA)
for
interchangeability
between
manufacturers.
Dimensions
include:
shaft
diameter,
shaft
height
and
motor
mounting
footprint.
FREQUENCY:
Any
cyclic
event,
whether
vibration,
alternating
current
or
rotational
speed.
Usually
expressed
in
cycles
per
second
(cps)
or
cycles.
FRICTION
LOSS:
Resistance
to
air
flow
through
any
duct
or
fitting,
given
in
terms
of
static
pressure.
FRP:
Abbreviation
for
fiberglass-reinforced-plastic.
FUGITIVE
EMISSIONS:
Emissions
not
caught
by
a
capture
system.
FULL-LOAD
SPEED:
The
speed
at
which
the
rated
horsepower
is
developed.
This
speed
is
less
than
synchronous
speed
and
varies
with
the
motor
type
and
manufacturer.
FULL-LOAD
TORQUE:
The
torque
required
to
produce
the
rated
horsepower
at
fullload
speed.
FUME:
An
aerosol
consisting
of
dispersed
liquids
or
solids
having
particles
smaller
than
1
micron.
Fine
particles
dispersed
in
air
and
formed
by
condensation,
such
as
heat
oxidation
of
metals
or
oil
smokes.
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