Page 77 - Vol.19

100
FLOW RATE VS.
DAMPER OPENING
90

PARALLEL BLADE ARRANGEMENT 80
ON-OFF
70
PERCENT OF FLOW RATE 50 PARALLEL
60
BLADES
OPPOSED BLADE ARRANGEMENT
MODULATING 40

BLADES
LOUVER DAMPER BLADE ARRANGEMENT DESIGN OPTIONS OPPOSED
30
20

Note: 10
This figure is typical, only. The relative blade open angle
versus percent of flow rate will vary with system pressure. 0
0 10 20 30 40 50 60 70 80 90
DEGREES OPEN

“L1” 200mm STD

“L2”

Type no. PFDCPA COUNTER WEIGHT
CENTER SUPPORT REQUIRED FOR
BLADES LONGER THAN 1200mm (”L1”)
SPECIFICATIONS
FRAME 200mm STANDARD LENGTH WITH
50mm FLANGES-3mm STAINLESS STEEL CENTER SUPPORT AS REQUIRED.
FLANGE MOUNTING HOLES (12×18 SLOT) EQUAL TO OR
LESS THAN 102 ON CENTER.
FAN INLET DAMPER BLADES-2.0mm STAINLESS STEEL.
FREQUENCY CONVERTER AXLES-20mm DIAMETER STAINLESS STEEL.
MOTORIZED SENSOR CHECK DAMPER LIQUID TIGHT SHAFT SEALS.
MANUAL ADJUSTABLE COUNTERWEIGHTS.

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NEW FAB ENGINEERING JOURNAL SEPTEMBER 2015 7 7