Duct
Sleeve
6 in.
Std. Clip
Length
CL
Duct
60 in. Duct
4 Req’d.
48 in. Duct
3 Req’d.
36 in. Duct
3 Req’d.
24 in. Duct
2 Req’d.
18 in. Duct &
Smaller
1 Req’d.
Clip Spacing
Typical TDC/TDF joint
6 in.
6 in.
9 in.
7 in.
7 in.
5 in.
5 in.
5 in.
5 in.
Figure 20
Duct End
Flange
Corner Piece
3/8 in. bolt
(optional)
Figure 21
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 Standards. Standard 6 in. (152 mm) metal clip may be used with
spacing as shown in diagram (
see Figure 19 & 20
). A
3
⁄
8
in. (9.5 mm) metal bolts and nuts may be used to fasten
together corner pieces (
see Figure 21
).
Duct
Sleeve
6 in.
Std. Clip
Length
CL
Duct
60 in. Duct
4 Req’d.
48 in. Duct
3 Req’d.
36 in. Duct
3 Req’d.
24 in. Duct
2 Req’d.
18 in. Duct &
Smaller
1 Req’d.
Clip Spacing
Typical TDC/TDF joint
6 in.
6 in.
9 in.
7 in.
7 in.
5 in.
5 in.
5 in.
5 in.
Figure 19
Fire Damper Sleeve
Neoprene or Butyl gasket
between all angles
Flanged system angles
(Attach per
manufacturer's
instructions)
Duct
3/8 in. bolts in
corners are optional
6 in. long metal cleat or 1/16 in.
max. thickness plastic cleat;
12 in. c-c (min. 1 per side)
Figure 18
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 18
).
Figure 22: Metal cleat method
Figure 23: Screw method
TDC/TDF to Manufactured Flange
Flanged connection systems manufactured by Ductmate, Durodyne, Ward, Nexus, Radiant T-35m, and MEZ can
be connected to TDC and TDF system as an alternate breakaway connection. This alternate connection is covered
under the UL certification of the damper. See Supplement: Duct-Sleeve Connection (IOM #468502) for more
information.
Spot weld or Tek screw per
manufacturer instructions
Spot weld or Tek screw per
manufacturer instructions
Damper Sleeve
Damper Sleeve
Butyl Gasket
Butyl Gasket
TDC or TDF
Connection
TDC or TDF
Connection
Metal cleat
#10 x 3/4”
TEK Screw
Spot weld or Tek screw per
manufacturer instructions
Spot weld or Tek screw per
manufacturer instructions
Damper Sleeve
Damper Sleeve
Butyl Gasket
Butyl Gasket
TDC or TDF
Connection
TDC or TDF
Connection
Metal cleat
#10 x 3/4”
TEK Screw
Curtain Fire Dampers
10
®
