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Refer to:
‘Installation Instructions for FD, DFD, SSFD, & KFD Models’
(Part #452763)
or
‘Installation Instructions for FSD-XXX, DFD-XXX, & CFSD-XXX
Series Fire & Combination Fire Smoke Dampers’ (Part #461336)
or
‘Installation Instructions for FD & DFD 150X Series Curtain Fire
Dampers’ (Part #453946) for additional details.
The field or factory installation of a sleeve on a fire rated
damper does not require any application of sealant to
maintain the UL 555 classification of the fire damper
assembly. However, sealant can be used along any
seams of a fire rated damper assembly (except along
blade edges) to help prevent air leakage in high
pressure applications.
The general installation of fire rated dampers is
addressed in UL555 (Standard for Fire Dampers,
Sixth Edition, June 1, 1999) in Section 18, “Installation
and Operating Instructions.” In reference to the use
of a sealant in the area between the inside of a wall
opening and the outside of the fire damper sleeve
(referred to as the “annular space,” see figure 1), UL
555 provides the following information:
18 General
18.1 A copy of the installation and operating
instructions shall be used as a reference in the
examination and testing of the damper. For these
purposes, a final printed copy is not required.
18.2 Each shipping container that contains a
damper(s) shall be provided with legible instructions
pertaining to the installation and operation of the
damper. Illustrations are used with the required
instructions toclarify the intent. Dampers shipped
in a common container are required to be provided
with one copy of the installation and operating
instructions only.
18.3 The instructions shall specify:
a) The type of wall or partition (masonry or gypboard)
or floor, as applicable;
b) The clearances required for expansion of the fire
damper, as applicable;
The list continues, but point 18.3b states that the
clearance requirement for fire damper expansion is
to be called out in the manufacturer’s installation
instructions. Greenheck’s installation instructions
for fire rated dampers (part #452763, #453946, or
#461336) provide the following specific clearance
requirements:
INSTALLATION INSTRUCTION SUPPLEMENT
Part Number 462703
Sealant Usage in Conjunction
with Fire Rated Dampers
Figure 1
Clearances Required Between Fire
Damper Sleeves and Wall / Floor
Openings
Fire dampers and sleeve assemblies expand during
periods of intense heat; it is essential that openings
in walls or floors be larger than the fire damper
and sleeve assembly to allow for this expansion.
Clearances required between the outside of fire
damper sleeve assemblies and wall/floor openings
are:
- Galvanized steel fire dampers and sleeves:
1/8 inch (3mm) per foot of damper width and
height with a minimum clearance ¼ inch (6mm)
and a maximum of 1½ (38mm) inches
- Stainless steel fire dampers and stainless
steel or galvanized sleeves: 3/16 inch (4.7mm)
per foot of damper width and height with a
minimum clearance 1/4 inch (6mm) and a
maximum of 2 inches (51mm).
These are total clearances (ignoring fastener heads)
and do not need to be equally spaced around the
damper.
In the event of a fire, the annular space allows for fire
damper expansion so that the damper will not bind
and fail to function properly. Sealant, or any other
foreign substance, that is introduced into the annular
space must allow for compliance so that the damper
can still expand. If the sealant used will not allow for
proper expansion, the clearance requirements will not
be met.
In conclusion, if a foreign material is to be introduced
into the clearance area, the Local Authority Having
Jurisdiction (AHJ) should decide if the application will
meet necessary expansion requirements.
Copyright © 2008 Greenheck Fan Corporation
462703 Sealant Supplement Rev. 2 March 2008