Panel fi lter assembly mounted on a blower. With two panels
removed, a 2936 Silencer can be seen mounted to the inlet of
the blower. This is the 2941 Filter-Silencer assembly. Without the
Silencer, the assembly number is 2921. Filters shown are wash-
able type, designated "W". Throwaway type is designated "T".
(Support leg is furnished as part of the assembly.)
Inlet fi lters remove 95-99% of airborne dirt to help keep blowers
and combustion systems clean and operating effi
Two types of panels are available:
Washable (W) fi lters (cost more initially, but can be cleaned
Throwaway (T) fi lter panels.
Washable panel fi lters remove 99% of airborne dirt; the throw-
away type is 95% eff ective fi ltering particles 5 microns and
larger. Pressure loss in clean fi lters is minimal.
A 2921 Filter Assembly can be added to a blower with an existing
2936 Silencer; or a Silencer can be added to an existing panel
fi lter assembly.
BENEFITS OF CLEAN AIR
Today’s precision burner orifi ces require clean combustion air.
Some dirt tends to collect on blower impellers, imbalancing them
and causing blower damage, noise, and ineffi
Costs of fi lter and maintaining it are small compared to costs
assoc iated with dirt build-up in combustion air piping and
manifolds, as well as in the burners themselves:
Burner capacity may be reduced.
ciency--particularly air/fuel ratio--is likely to be
aff ected adversely.
Dismantling large pipe is expensive and time-consuming
c ially harmful if it necessitates unscheduled furnace
shutdown), but it may be necessary to remove accumulated
INSPECTION AND MAINTENANCE
o maintain its low pressure loss rating--less than 0.25 osi
at maximum fl ow--fi lters should be inspected regularly, as
frequently as ambient conditions dictate. When dirty, "W" panels
are cleaned as described below. Do not attempt to clean any
fi lter while it is mounted on blower.
Keeping spare panels on hand is recommended, even the
washable (W) type, to avoid running blower without fi lter while
element is being cleaned.
To clean washable fi lters, remove them from the assembly and
wash in kerosene or any commercial cleaning solution, such
as Oakite and water. Allow to dry thoroughly, then immerse in
engine oil, SÆ 30 to 50 viscosity. Drain off excess oil and reas-
WARNING: Do not clean fi lters in gasoline--doing so could
cause an explosion in air piping.
2921 and 2941 Assembly designations are descriptive:
2941: fi lter and silencer
2921: fi lter only
14: 14" pipe connection (female) 20: 20" pipe connection
02: two sections long
03: three sections long
8: eight panel fi lters
9: nine panels
W: washable type
T: throwaway type
Each section has provision for four panel fi lters. When less than
four are required, metal blanks are supplied (these could be
replaced with panels later if additional capacity is required).
All Panels are 16" × 25" × 2". Washable fi lters (1-2873-2) are inter-
changeable with throwaway (1-2873-1).
Panel fi lters are not oiled as shipped.
Product Overview | Panel Filters/Silencers