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

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