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Chapter 2 - Principles of Operation
Balancing Dampers
Balancing Dampers
Balancing Dampers Overview
The ELXC and ELXC-UVi Series Ventilators, as a standard, come with one of three models of Gaylord Indus-
tries Listed Balancing Dampers. Balancing dampers would typically be used when two or more Ventilators
are connected to a common exhaust fan. The purpose of the balancing damper is to raise or lower the
airflow of each Ventilator to achieve the desired exhaust rate. One of the damper models is a combination
Fire/Balancing Damper. If the Ventilators include a Balancing Damper the suffix GBD, GEBD or GFBD will be
included in the Ventilator model number shown on the Ventilator Nameplate. Refer to Figure 5-4-1 on page
5-4 for an example of the nameplate.
The three damper models available are as follows:
1. Model GBD (Gaylord Balancing Damper) is a manually adjusted balancing damper with internal setting
(refer to Figure 2-20-2). Adjustment is made by removing the Extractor under the exhaust duct collar and
reaching up with a wrench to the Adjusting Nut. The nut is loosened, dampers manually adjusted and the
Adjusting Nut retightened.
2. Model GEBD (Gaylord Electric Balancing Damper) is an electrically adjusted balancing damper (Refer to
figure 2-20-1). Adjustment is made by use of a potentiometer, one for each damper, mounted in a junction
box located in the roof of the Ventilator (Refer to figure 2-20-3). The GEBD is set up to automatically close
upon shutting off the exhaust fan every night. This feature prevents conditioned air from exiting the building
through the Ventilator. In the event of a power failure the damper will automatically open.
3. Model GFBD (Gaylord Fire / Balancing Damper) is a combination thermostatically activated fire damper/
electrically adjusted balancing damper. With this option one or more thermostats are mounted in the ex-
haust duct collar of the Ventilator (Refer to Figure 2-6-2). The thermostats are factory set for 250°F., and in
the event of a fire when the thermostat(s) reach 250°F., the damper will close to prevent fire from extending
into the ductwork and up to the exhaust fan. Adjustment for balancing of the system is made by use of a
potentiometer, one for each damper, mounted in a junction box located in the roof of the Ventilator (Refer to
figure 2-20-3). The GEBD is set up to automatically close upon shutting off the exhaust fan every night. This
feature prevents conditioned air from exiting the building through the ventilator. In the event of a power
failure the damper will automatically open.
Adjustment
The adjustment of all the models relies on the internal dimension between the two blades called the Damper
Set Dimension, "DSD" (Refer to Figure 2-20-2). The manipulation of this distance will balance the airflow be-
tween multiple section Ventilators. Refer to the Measuring Airflow section beginning on page 5-1 for more
details.
2-19
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