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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. (152 mm) metal clip may be used with spacing as
shown in diagram (see Figure 14 & 15). A
pieces (see Figure 16).
Sleeve
Duct
Typical TDC/TDF joint
Figure 14
Sleeve
Duct
Typical TDC/TDF joint
#10 x 3/4"
TEK Screw
TDC or TDF
Connection
TDC/TDF to Manufactured Flange
Butyl Gasket
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.
Metal cleat
TDC or TDF
Connection
Butyl Gasket
Figure 23: Metal cleat method
®
⁄
in. (9.5 mm) metal bolts and nuts may be used to fasten together corner
3
8
Clip Spacing
Std. Clip
Length
9 in.
6 in.
6 in.
60 in. Duct
4 Req'd.
Clip Spacing
Std. Clip
7 in.
Length
48 in. Duct
3 Req'd.
5 in.
6 in.
6 in.
60 in. Duct
36 in. Duct
3 Req'd.
4 Req'd.
5 in.
7 in.
24 in. Duct
48 in. Duct
2 Req'd.
3 Req'd.
5 in.
18 in. Duct
&
Smaller
36 in. Duct
C L
1 Req'd.
Duct
3 Req'd.
5 in.
24 in. Duct
2 Req'd.
18 in. Duct
&
Smaller
1 Req'd.
Figure 15
Spot weld or Tek screw per
manufacturer instructions
Damper Sleeve
Spot weld or Tek screw per
manufacturer instructions
Damper Sleeve
6 in.
7 in.
9 in.
5 in.
6 in.
5 in.
7 in.
5 in.
5 in.
C L
Duct
#10 x 3/4"
TEK Screw
TDC or TDF
Connection
Butyl Gasket
Figure 24: Screw method
Metal cleat
TDC or TDF
Connection
Butyl Gasket
Duct End
Flange
Corner Piece
Figure 16
Spot weld or Tek screw per
manufacturer instructions
Damper Sleeve
Spot weld or Tek screw per
manufacturer instructions
Damper Sleeve
GFSD Series
3/8 in. bolt
(optional)
9
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