110 Print Reading for HVACR
Copyright Goodheart-Willcox Co., Inc.
■ Motorized dampers. These open and close to increase or decrease
the amount of air introduced to a particular area in response to
some condition, such as occupancy.
■ Back draft dampers. Allow air to fl ow in only one direction and
closes if air fl ows in the opposite direction.
Dampers also play a large role in ensuring the safety of occupants in
a conditioned space. If smoke or fi re is detected in a duct, dampers close
to prevent the air-conditioning system’s blower from potentially feeding
the fi re. Symbols for smoke and fi re dampers are shown in Figure 5-52.
5.4.4 Additional Components and Accessories
Although a legend showing the symbols used on the particular set of
drawings will be provided with the plans used on the job site, Figure 5-53
displays some additional symbols you will likely encounter when reading
air-distribution prints.
FD
FD
SD
SD SFD
SD FD SFD
Standard
Vertically mounted
Horizontal mounted
Key
FD =Fire damper SD =Smoke damper SFD =Combination smoke/fire damper
B
C
A
Goodheart-Willcox Publisher
Figure 5-52. A—Generic symbols for fi re and some dampers. B—Symbols for
vertically installed fi re, smoke, and combination smoke/fi re dampers. C—Symbols for
horizontally installed fi re, smoke, and combination smoke/fi re dampers.
Copyright Goodheart-Willcox Co., Inc.
■ Motorized dampers. These open and close to increase or decrease
the amount of air introduced to a particular area in response to
some condition, such as occupancy.
■ Back draft dampers. Allow air to fl ow in only one direction and
closes if air fl ows in the opposite direction.
Dampers also play a large role in ensuring the safety of occupants in
a conditioned space. If smoke or fi re is detected in a duct, dampers close
to prevent the air-conditioning system’s blower from potentially feeding
the fi re. Symbols for smoke and fi re dampers are shown in Figure 5-52.
5.4.4 Additional Components and Accessories
Although a legend showing the symbols used on the particular set of
drawings will be provided with the plans used on the job site, Figure 5-53
displays some additional symbols you will likely encounter when reading
air-distribution prints.
FD
FD
SD
SD SFD
SD FD SFD
Standard
Vertically mounted
Horizontal mounted
Key
FD =Fire damper SD =Smoke damper SFD =Combination smoke/fire damper
B
C
A
Goodheart-Willcox Publisher
Figure 5-52. A—Generic symbols for fi re and some dampers. B—Symbols for
vertically installed fi re, smoke, and combination smoke/fi re dampers. C—Symbols for
horizontally installed fi re, smoke, and combination smoke/fi re dampers.