Inlet fi lters remove 99% of air-borne dirt to help keep blowers
and combustion systems clean and operating effi
ciently.
Two styles are available:
An oil-wetted
metal
screen that can be cleaned and reused
indefi nitely.
A
paper
element that normally can be reused 3-6 times, then
is thrown away and replaced.
2923 assemblies allow fi eld conversion from screen to paper
style, or vice versa.
BENEFITS OF CLEAN AIR
Todays precision burner orifi ces require clean combustion air.
Certain kinds of work in a furnace or kiln may be defaced or
otherwise damaged by dirt coming through burners and deposit-
ing on the product.
Some dirt tends to collect on blower impellers, imbalancing them
and causing blower damage, noise, and ineffi
ciency.
Costs of fi lter and maintaining it are small compared to costs
associated with dirt build-up in combustion air piping and
manifolds, as well in the burners themselves:
Burner capacity may be reduced.
Burner
effi
ciency--particularly air/fuel ratio--is likely to be
aff ected adversely.
Dismantling large pipe is expensive and time-consuming
(especially harmful if it necessitates unscheduled furnace
shutdown), but it may be necessary to remove accumulated
dirt.
INSPECTION AND MAINTENANCE
To maintain its low pressure loss rating--less than 0.25 osi at
maximum fl ow--fi lter element should be inspected regularly, as
frequently as ambient conditions dictate. When dirty, elements
are cleaned as described below. Do not attempt to clean any
fi lter while it is mounted on blower.
Keeping a spare element on hand is recommended to avoid
running the blower without fi lter while element is being cleaned.
CYLINDRICAL METAL SCREENS
(add suffi
x W to fi lter
designation)
Unscrew wing nuts and remove screen element. Wash in
kerosene or any commerical cleaning solution such as Oakite
and water. Allow to dry thoroughly; drying can be expedited
by carefully blowing compressed air through element. Immerse
element in engine oil, S.A.E. 30 to 50 viscosity. Drain excess
oil, and reassemble element onto blower inlet.
WARNING: Do
not use gasoline to clean element—doing so could cause a
gasoline vapor explosion in air piping.
CYLINDRICAL PAPER ELEMENTS
(add suffi
x T to fi lter
designation)
Three alternate methods of cleaning:
1.
"Reverse
fl ush" with a stream of compressed air reduced to
less than 30 psi, with eff ective personal protection equipment.
2.
"Reverse
fl ush" with a stream of clean, clear water (40 psi
or less). Allow fi lter to air dry.
3. Filter can be submerged and gently agitated in a solution of
lukewarm water (120°F or less) and a non-sudsing household
detergent. Then rinse with clear water; shake the fi lter gently
to remove excess water and allow it to air dry.
With proper care, an element can usually be cleaned 3 to 6
times. Be sure to inspect the element for damage aft er each
cleaning.
Product Overview | Blower Filters
Bulletin 2923
Page 2