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14 ga. (0.075 in.) -
10 ga. (0.138 in.)
[2 mm - 3.5 mm]
16 ga. (0.060 in.)
16 ga. (0.060 in.)
18 ga. (0.048 in.)
20 ga. (0.036 in.)
26 ga. (0.018 in.)
See Breakaway Connection section for additional information.
UL Standard 555 requires all ducts to terminate at fire damper sleeves.
Approved Breakaway Connections
All breakaway connections described below may utilize the following duct sealants: PA2084T duct sealant adhesive
manufactured by Precision, DP1010 water base duct sealant manufactured by Design Polymerics, Grey Pookie,
Ductmate PROseal®, or CL Ward S Seal in accordance with SMACNA recommendations.
Transverse Joints
The transverse joints shown below are approved as breakaway connections.
• A maximum of two #10 (19 mm) sheet metal screws on each side and on the bottom may be used. The screws
should be located in the center of the slip pocket and penetrate both sides of the slip pocket.
• Dampers up to 20 inches (508 mm) high may use transverse joints on the top and bottom and Drive Slip joints
(see Figure 11) on the sides.
Plain "S" Slip
Hemmed "S" Slip
Inside Slip Joint
Standing "S" (Alt.)
(Bar Reinforced)
Figure 10
®
Sleeve Gauge
Duct Dimension
All duct sizes
36 in. (914 mm) max. width
24 in. (610 mm) max. height
[1.5 mm]
24 in. (610 mm) diameter
All duct sizes
[1.5 mm]
85 in. (2159 mm) wide and
[1.2 mm]
55 in. - 84 in. wide
[0.9 mm]
(1397 mm - 2134 mm)
22 ga. (.030 in.)
31 in. - 54 in. wide
[0.76 mm]
(787 mm - 1372 mm)
24 ga. (0.024)
13 in. - 30 in. wide
[0.6 mm]
(330 mm - 762 mm)
12 in. wide and under
[0.46 mm]
(305 mm)
Double "S" Slip
Standing "S"
Standing "S" (Alt.)
Standing "S"
Standing "S"
(Angle Reinforced)
Type of Duct to Sleeve
Connection Permitted
Rigid or
Breakaway
Rigid or Breakaway
over
Breakaway only
Drive Slip Joint
Figure 11
GFSD Series
7
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