Breakaway Connections - Greenheck FD150X Installation, Operation And Maintenance Manual

Breakaway Connections

Traditional Breakaway Style Transverse Joints
Transverse joints illustrated in Figure 5 have always
been approved as breakaway connections. SMACNA
testing has also approved the following variations as
breakaway connections.
• Standing "S" joints can be applied with #10
sheet metal screws (through joint and duct) subject
to the following limitations: Maximum 2 screws in
each side and in bottom joint.
• Transverse joints illustrated
can be applied as top and
bottom joints with Drive Slip -
side joints in duct heights up to 20 in.
Round and Oval Duct Breakaway Connections
Round or flat oval ducts connected to factory supplied Type
R, CR, or CO damper collars may use #10 sheet metal
screws as follows:
• Ducts 22 in. wide (or dia.) and smaller may use 3
screws.
• Ducts larger than 22 in. wide (or dia.) may use 5 screws.
Proprietary Flange System Breakaway Connections
(Ductmate, Ward, Nexus)
Flanged connection systems manufactured by Ductmate,
Ward, and Nexus are approved as breakaway
connections when installed as illustrated in Figure 6.
(
TDC by Lockformer, TDF by Engle)
TDC and TDF systems are approved as breakaway connections when installed as described in the SMACNA Duct
Construction Standards. Standard 6 in. metal clips may be used with spacing (see Figure 7). Three-eighth in. metal bolts and
nuts may be used to fasten together corner pieces (see Figure 8).
Sleeve
T ypical TDC/TDF joint
Figure 7: Detail of proprietary flanged system breakaway
connections.
Drive Slip Joint
Clip Spacing
Std. Clip
Length
6 in. 6 in.
60 in. Duct
4 Req'd.
7 in.
48 in. Duct
3 Req'd.
5 in.
36 in. Duct
Duct
3 Req'd.
5 in.
24 in. Duct
2 Req'd.
18 in. Duct &
Smaller
1 Req'd.
Plain "S" Slip
Inside Slip Joint
Standing "S" (Alt.)
Figure 5: Traditional breakaway style transverse joints.
NOTE: All breakaway connections described may have duct sealant, PA2084T
duct sealant adhesive manufactured by Precision, applied in
accordance with SMACNA recommendations.
6 in. long 1 /
16
thickness plastic cleats;
12 in. c-c (min. 1 per side)
Flanged system angles
(Attach per
manufacturer's
instructions)
Duct
Figure 6: Detail of manufactured flanged system
breakaway connections.
9 in.
6 in.
7 in.
5 in.
5 in.
C L
Duct
Figure 8: Detail of bolted corner.
Hemmed "S" Slip
Standing "S"
Standing "S"
(Bar Reinforced)
in. max.
Neoprene gasket
between all angles
Duct End
Flange
Double "S" Slip
Standing "S" (Alt.)
Standing "S"
(Angle Reinforced)
Fire Damper Sleeve
Corners may be bolted
with 3/8 in. nuts and bolts
Corner Piece
3 /8 in. bolt
(optional)
5