Page 75 - Gaylord Blue Book 2021

GBD Balancing Damper

ITEM NO.

MODEL “GBD” SERIES BALANCING DAMPER

FOR COMMERCIAL RESTAURANT EXHAUST HOODS

GENERAL SPECIFICATIONS

Furnish Gaylord Damper Model “GBD”- ”, or “GEBD”-
in accordance with the following specifications:

GENERAL: Each balancing damper shall be of dual opposing blade
construction fabricated from stainless steel and built to meet the
duct sizing requirements of the commercial cooking hood it serves.
Each damper blade shall be composed of two interlocking stainless-
steel skins. The blades are to be assembled in such a manner as to
create low impact surfaces that will reduce or even eliminate the
accumulation of grease from normal cooking operations.

OPERATION OPTIONS:

• Model GBD-IS Series - The balancing damper shall have an
Internal Set to allow the damper to be adjusted and secured,
by tightening a self-locking nut from within the hood plenum.
The damper setting and locking mechanism shall not interfere
with any duct wrap. This model is intended for use as a duct-
collar replacement.
• Model GBD-ES Series - The balancing damper shall have an
External Set to allow the damper to be adjusted and secured
by tightening a self-locking nut mounted on the outside of
the damper housing. Access to the damper adjustment and
locking mechanism shall be made through the duct shaft, fire
wrap or any other obstructions in accordance with the IMC and
NFPA-96. Figure 1. GBD-ES Series Balancing Damper
See figure 3 for proper installation.
• Model GEBD Series - The balancing damper shall have an
electric motor to control the damper and shall be adjusted by
a variable 2 to 10 VDC input from a potentiometer provided
with the damper. The potentiometer shall be in a junction box
mounted external to the hood, as shown on the plans, and
wired to the Balancing Damper by the electrical contractor.
Access to the damper motor shall be made through the duct
shaft, fire wrap or any other obstructions in accordance with DAMPER OPERATION: Each damper is field adjustable to allow your
the IMC and NFPA-96. commercial cooking ventilation system to be perfectly optimized. GBD-
IS and GBD-ES dampers are manually adjusted and secured in place by
use of a self- locking nut. The GEBD electric damper series is adjusted by
a variable 2 to 10 VDC input which will allow for easy adjustment and bal-
APPLICATION: The GBD and GEBD Series dampers are to be ancing by use of a provided potentiometer or as part of a larger control
used downstream of a listed Type I commercial cooking hood. system designed to reduce air volumes based on equipment and cook-
Typically, they are mounted directly to the hood duct collar but ing requirements. The damper may be wired to the exhaust fan so that
can be located downstream of the hood. (refer to Figure 3 for it closes upon fan deactivation to preventing cold air from drafting into
proper installation) They are intended to balance the exhaust the kitchen once cooking operations have halted. The electric damper
flows of two or more hoods on the same exhaust system. The may also be used to reduce or even shut down particular hood sections
GBD and GEBD Series Dampers have been tested and are listed when cooking lines are at idle or not in operation. The electric damper
as an Exhaust System Accessory under UL 710 and ULC S646, may be interfaced with a variable air volume system, possibly achieving
and are constructed under the guidelines specified in NFPA-96. U.S. Green Building Council LEED™ credits in the area of Energy Efficiency.

GAYLORD INDUSTRIES
10900 SW AVERY ST • TUALATIN, OR 97062 U.S.A.
PHONE: 503-691-2010 • 800-547-9696
Patent Pending FAX: 503-692-6048 • email: info@gaylordventilation.com
www.gaylordventilation.com