Multiple Section Dampers; Baffles - Honeywell AUTOMATIC CONTROL SI Edition Engineering Manual

MULTIPLE SECTION DAMPERS

Typically, single rectangular dampers are manufactured in
incremental sizes, up to maximum horizontal and vertical limits.
If system requirements dictate damper sizes larger than the
maximum available, single dampers can be arranged in multiple
section assemblies (Fig. 13).
Fig. 13. Multiple Section Damper Assembly.
Multiple section damper assemblies have the drive blades
interconnected between sections so all the sections operate in
unison. Figures 14 and 15 show methods of connecting drive
blades and cross-connecting damper blade linkage for a multiple
section damper. As a multiple section damper assembly
increases in size, additional precautions are required to
withstand pressure drop forces, including:
— Increased bracing at intersecting corners of individual
dampers.
— Additional external supports from the damper frame near
the center of the assembly to other solid structural
members adjacent to the assembly.
ENGINEERING MANUAL OF AUTOMATIC CONTROL
Fig. 14. Drive Blade Axle Extended for Horizontal
M10417
Fig. 15. Drive Blade Linkage for Vertical

BAFFLES

System duct sizes do not always correspond with the available
sizes of a damper or multiple section damper assembly. In these
cases, a baffle is used inside the duct to surround the damper
(Fig. 16).
451
DAMPER SELECTION AND SIZING
DRIVE
BLADE
DRIVE
BLADE
AXLE
Multiple Section Damper Assembly.
Multiple Section Damper Assembly.
DRIVE
BLADE
M10410
M10411