Greenheck Firestop Material DFD Series Manual, Installation Instruction Supplement

These instructions apply to 1
1
⁄2 hour rated combination 
fire smoke dampers and dynamic rated multi-blade 
fire dampers mounted in masonry, block, or metal or 
wood stud walls. Note: This installation is intended 
for underfloor applications where the damper/duct is 
directly above (4 in. [101mm] or less) the rated concrete 
floor (see Figure 2). No duct impact test was conducted. 
Specific requirements in these instructions are mandatory. 
These instructions meet the requirements of UL 555.
Installation shall comply with the requirements of NFPA 
90A (Standard for the Installation of Air Conditioning and 
Ventilating Systems) and UL Classification R13317.
Fire and Combination Fire/Smoke dampers up to a 
maximum size of 72 in. W x 96 in. H (1828mm x 2438mm) 
may be installed as instructed below.
1.  Expansion Clearance - Fire damper and sleeve 
assemblies expand during periods of intense heat. 
Therefore, it is essential that openings in walls or 
floors be larger than the fire or fire/smoke damper and 
sleeve assembly to allow for this expansion. Minimum 
clearances required between the outside of fire or fire/
smoke damper sleeve assemblies and wall openings 
are:
•  Galvanized steel fire dampers and sleeves: 
1
⁄8 in. 
(3mm) per foot of damper width and height with a 
minimum clearance of 
1
⁄4 in. (6mm), maximum of 1 
1
⁄2 in. (38mm). Recommended clearances, for width 
and/or height dimensions of:
1) 48 in. (1219mm) or less: 
1
⁄2 in. (13mm) 
clearance
2) More than 48 in. (1219mm) and 96 in. 
(2438mm) or less: 1 in. (25mm) clearance
3) More than 96 in.(2438mm): 1
1
⁄2 in. (38mm) 
clearance
•  Stainless steel fire/smoke dampers and stainless 
steel or galvanized sleeves: 
3
⁄16 in. (4.7mm) per 
foot of damper width and height with a minimum 
clearance of 1/4 in. (6mm) , maximum of 2 in. 
(51mm)

®

Copyright © 2008 Greenheck Fan Corporation
Firestop Material IOM Rev 2 Mar 2008
Part number 469419
Firestop Material
INSTALLATION INSTRUCTION SUPPLEMENT
Refer to:
‘Installation Instructions for FSD-XXX, DFD-XXX,  
SSFSD-XXX & CFSD-XXX Series Fire & Combination Fire 
Smoke Dampers’ (Part #461336)
DFD Series                
1
1
/2 Hour Multi-Blade Fire Dampers and
FSD Series                     
1
1
/2 Hour Combination Fire Smoke 
Dampers-Vertical Mount
Recommended clearances, for width and/or height dimen-
sions of:
          1) 48 in. (1219mm) or less: 
3
⁄4 in. (19mm) clearance
2.  Packing (optional) - Polyethylene backer rod, recessed from 
surfaces of wall to accommodate the required thickness of 
fill material.
3.  Fill Material - Hilti Corporation - FS-One fire stop caulk 
applied to a minimum 5/8 in. (16mm) thickness within the 
annular space and flush with both surfaces of the wall 
with a 1 in. (25mm) overlap onto the gypsum board. If the 
damper/sleeve assembly comes into contact with the wall, 
a minimum of 3/8 in. (10mm) diameter bead shall be applied 
to the interface between the sleeve and contact surface. 
Firestop should be installed according to manufacturers 
instructions and firestop instructions given in the 2007 UL 
Fire Resistance Directory Volume 2B, page 4471. 
4.  Retaining Clip - Retaining clip 1 in. x 2 in. x 2 in. x 16 gauge 
(25mm x 51mm x 51mm x 1.5mm)  is attached to one side of 
the wall with 1 1/2 in. (38mm) long #8 sheet metal screws  or 
masonry screws in the masonry wall. The 1 in. (25mm) leg of 
the clip shall be attached to the damper sleeve with 1/2 in. 
(13mm) long #10 sheet metal screws. The retaining clips are 
required to be spaced a maximum of 6 in. (152mm) from the 
top of the sleeve and spaced a maximum of 12 in. (305mm) 
on center on the sides of the unit only. 

Floor tiles
Rated wall
Fill material
Fill material
Ductwork
max. 4 in. (102mm)
Rated masonry floor
Retaining
clip
(one side only on bottom)

Figure 1
Figure 2

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