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Round and Oval Duct Breakaway Connections
Factory furnished duct collars, type R and O, are also considered breakaway (see Figure 12).
Round or flat oval ducts connected to Type R or O damper collars shall be attached with #10 (19 mm) sheet metal
screws as follows:
• Ducts up to 22 in. (558 mm) wide (or dia.) and less shall have three screws.
• Ducts larger than 22 in. (558 mm) wide (or dia.) up to and including 36 in. (914 mm) wide (or dia.) shall have five
screws.
Manufactured Flanged System Breakaway Connections
Flanged connection systems manufactured by Ductmate, Durodyne, Ward, Nexus, Radiant T-35m, and MEZ are
approved as breakaway connections when installed as illustrated (see Figure 13).
8
GFSD Series
Duct
Type R and O
factory furnished
duct collars qualify
as breakaway
connections.
Duct
Figure 12: Type R and O Transition
6 in. long metal cleat or 1/16 in.
max. thickness plastic cleat;
12 in. c-c (min. 1 per side)
Flanged system angles
(Attach per
manufacturer's
instructions)
Duct
Figure 13
Sleeve
Damper
Type B
r
Wall or Floo
Sleeve
Damper
Type R, O
Fire Damper Sleeve
3/8 in. bolts in
corners are optional
Neoprene or Butyl gasket
between all angles
®
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