Greenheck Fan OFSD-311 Ventilation Hood User Manual


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Pressure Drop Data OFSD-311
ThispressuredroptestingwasconductedinaccordancewithAMCAStandard500-Dusingthethreeconfigurationsshown.All
data has been corrected to represent standard air at a density of .075 lb/ft
3
(1.201 kg/m
3
).
ActualpressuredropfoundinanyHVACsystemisacombinationofmanyfactors.Thispressuredropinformationalongwithan
analysis of other system influences should be used to estimate actual pressure losses for a damper installed in a given HVAC
system.
AMCA Test Figures
Figure 5.3Illustratesafullyducteddamper.Thisconfigurationhasthelowestpressuredropofthethreetestconfigurations
because entrance and exit losses are minimized by straight duct runs upstream and downstream of the damper.
Figure 5.2Illustratesaducteddamperexhaustingairintoanopenarea.Thiscongurationhasalowerpressuredropthan
Figure 5.5 because entrance losses are minimized by a straight duct run upstream of the damper.
Figure 5.5Illustratesaplenummounteddamper.Thisconfigurationhasthehighestpressuredropbecauseofextremelyhigh
entrance and exit losses due to the sudden changes of area in the system.
5D 6D
5D
D
4 (W) (H)
3.14
Figure 5.3
5D 6D
5D
D
4 (W) (H)
3.14
Figure 5.5
Figure 5.2
5D 6D
5D
D
4 (W) (H
)
3.14
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