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Installation Guidelines-
The basic intent of a proper installation is to secure the heavy duty/industrial blast damper into the opening in such
a manner as to prevent distortion and disruption of damper operation. The following items will aid in completing the
damper installation in a timely and effective manner.
1) Dampers are supplied standard without mounting holes. Drill or punch as required. Use appropriate gasketing
between mating flanges. Closed cell sponge rubber, solid rubber, maximum 60 durometer, or fiberglass drop
warp tape is recommended. If damper is replacing existing damper, clean mating surfaces prior to installing new
damper.
2) Damper blades remain within the frame depth.
3) The HBS-330 is installed the same direction as flow. The HBS-331 is installed opposite direction as normal flow.
Damper blade centerline MUST be horizontal. Consult Greenheck for modifications if damper is to be mounted
with blade centerlines vertical.
4) Isolate damper from high vibratory loadings.
Do's
1) Use damper lifting lugs as provided.
2) Install all mounting bolts before tightening. Tighten in even and staggered pattern to evenly compress flange
gasketing.
3) Mating flange must be flat and in the same plane.
4) Verify that damper does not strike mating ductwork or internal ductwork reinforcing when blade is in the open
position.
5) Provide expansion joints upstream/downstream for angled ductwork so damper is not subjected to thermal/wind
load forces off the centerline of damper.
Dont's
1) Do not lift damper with chain/strap with blade propped open and with chain/strap through frame as this could
damage blade seal.
2) Do not use linkage or axles as lifting point.
3) Do not use prybar to match frame holes to mating ductwork as frame can be warped or pulled out of square by
excessive force.
4) Do not tighten mounting bolts by starting at one point and "walking" around the damper as uneven flange
compression can result.
Damper Maintenance
Greenheck's dampers are designed to be trouble free and hassle free under normal operation. Dampers are to be
installed square and straight so as to prevent binding during operation. The following annual damper maintenance
suggestions will help to insure proper damper operation and increase the life expectancy of the damper.
Foreign Matter
Moving Parts
Closure
Operation
Failure to follow instructions will void all warranties
Over the course of time, dirt and grime may collect on damper surfaces. The damper
surfaces should be cleaned to prevent hindrance to airflow.
Make sure that parts such as linkage, bearings, blades, etc. that are intended to move
freely, can do so. Lubricating these components can prevent possible rusting and
unnecessary friction increase. Use only a molybdenum spray oil or similar graphite based
oil on sleeve bearings as regular lubricating oil will attract dirt.
Bearings. Synthetic, oil impregnated, carbon sleeve, and ball bearings (without grease
fittings) do not require lubrication. Ball bearings with grease fittings should be lubricated as
follows:
Maximum Duct Temperature
250° F
121° C
600° F
316° C
Remove foreign materials that may be interfering with blade closure or effective sealing of
the blades with each other or with the frame.
Blade Seals. Inspect yearly and replace as necessary.
Axle Seals. Inspect and adjust as necessary.
While operating the damper through its full cycle, check to see that the blades open and
close properly. If there is a problem, check for loose linkage. Tighten the linkage where
required.
Lubricant
NLG1 Grade 2 lithium
12-hydrostearate grease
Hi temperature synthetic, Mobil-
lith SHC100 or equal
Minimum Frequency
twice a year
four times a year
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