Greenheck DFD Series Installation, Operation And Maintenance Manual page 14

Duct to Sleeve Connection cont....
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 up to 22 in. (558mm) wide (or dia.) and less
shall have three screws.
• Ducts larger than 22 in. (558mm) wide (or dia.) up to
and including 36 in. (914mm) wide (or dia.) shall have
five screws.
Factory furnished duct collars, type R and O, are also
considered breakaway (see Figure 17).
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).
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. (152mm) metal clip may be used with
spacing as shown in diagram (see Figure 19 & 20). 3
together corner pieces (see Figure 21).
Sleeve
Duct
Typical TDC/TDF joint
Figure 19
Sleeve
Duct
Typical TDC/TDF joint
10
Curtain Fire Dampers
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 18
Clip Spacing
Std. Clip
Length
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
C L
36 in. Duct
1 Req'd.
3 Req'd. Duct
5 in.
24 in. Duct
2 Req'd.
18 in. Duct &
Smaller
1 Req'd.
Figure 20
Type R and O
factory furnished
duct collars qualify
as breakaway
connections.
Figure 17: Type R and O Transition
Neoprene or Butyl gasket
between all angles
⁄ in. (9.5mm) metal bolts and nuts may be used to fasten
3
8
9 in.
6 in.
7 in.
9 in.
5 in.
6 in.
5 in.
7 in.
5 in.
5 in.
C L
Duct
Duct
Type B
Wall or Floo
Duct
Type R, O
Fire Damper Sleeve
3/8 in. bolts in
corners are optional
Duct End
Flange
Figure 21
Damper
r
Sleeve
Damper
Corner Piece
3/8 in. bolt
(optional)