Table of Contents
Advertisement
8. DUCT-SLEEVE CONNECTIONS
Traditional Breakaway Style Transverse Joints
Transverse joints illustrated at right have always been
approved as breakaway connections. SMACNA testing
has also approved the following variations as breakaway
connections.
• The breakaway connections shown to the right (Fig.
12) can be applied with maximum of two #10 (19mm)
sheet metal screws on each side and on the bottom
located in the center of the slip pocket and penetrating
both sides of the slip pocket.
• Transverse joints illustrated
can be applied as top and
bottom joints with Drive Slip -
side joints in duct heights up
to 20 inches (508mm) see Fig. 11.
Plain "S" Slip
Hemmed "S" Slip
Inside Slip Joint
Standing "S" (Alt.)
(Bar Reinforced)
Fig. 12
Round and Oval Duct Breakaway Connections
Round or flat oval ducts connected to Type R or O damper
collars shall be attached with #10 (19mm) sheet metal
screws as follows:
• Ducts to 22 in. (558mm) wide or diameter and smaller
shall have three screws.
• Ducts larger than 22 in. wide (558mm) or diameter
up to and including 36 in. (914mm) wide or diameter
shall have five screws.
All breakaway connections described may have duct
NOTE:
sealant applied, PA2084T duct sealant adhesive
manufactured by Precision, DP1010 water base duct
sealant manufactured by Design Polymetrics, Grey
Pookie, or Ductmate PROseal
in accordance with SMACNA recommendations.
Manufactured Flanged System Breakaway Connections
(Fig. 13)
Flanged connection systems manufactured by Ductmate,
Ward, and Nexus are approved as breakaway connections
when installed as illustrated (Fig. 13).
Drive Slip Joint
Fig. 11
Double "S" Slip
Standing "S"
Standing "S" (Alt.)
Standing "S"
Standing "S"
(Angle Reinforced)
Sleeve
, or CL Ward S Seal
®
6 in. long 1 /16 in. max.
thickness plastic cleats;
12 in. c-c (min. 1 per side)
Flanged system angles
(Attach per
manufacturer's
instructions)
Duct
Fig. 13
Proprietary Flange System Breakaway Connections
(TDC by Lockformer, TDF by Engle)
TDC and TDF systems are approved as breakaway
connections when installed as described in the TDC or
TDF addendum to the SMACNA
Duct Construction. Standard 6 in.
(152mm) metal clip may be used
with spacing as shown in diagram
(Fig. 14 & 15). 3/8 in. (9.5mm)
metal bolts and nuts may be used
to fasten together corner pieces.
(see Fig. 16)
60 in. Duct
Duct
Typical TDC/TDF joint
Fig. 15
Sleeve
Clip Spacing
Std. Clip
Length
6 in.
6 in.
4 Req'd.
7 in.
48 in. Duct
3 Req'd.
5 in.
36 in. Duct
3 Req'd.
5 in.
24 in. Duct
2 Req'd.
18 in. Duct &
Smaller
C L
1 Req'd.
Duct
Duct End
Flange
Fig. 16
Fire Damper Sleeve
Do not bolt corners
Neoprene gasket
between all angles
60 in. Duct
4 Req'd.
48 in. Duc
3 Req'd.
36 in. Du
Duct
Typical TDC/TDF joint
Fig. 14
9 in.
6 in.
7 in.
5 in.
5 in.
Corner Piece
3/8 in. bolt
(optional)
Clip S
6
3 Req'd
24 in.
2 Req
18
Hide quick links:
Advertisement
Table of Contents
