Greenheck FD Series Installation, Operation And Maintenance Instructions page 2

These instructions apply to 1
and concrete floors. 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. U.L. listing R13317, California State Fire Marshal listings 3225-0981:102 & 3225-0981:107, and New York City
BSA/MEA listing 260-91-M apply to these dampers.
1. CLEARANCES REQUIRED BETWEEN FIRE
DAMPER SLEEVES AND WALL/FLOOR
OPENINGS
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 damper and sleeve
assembly to allow for this expansion. Minimum clearances
required between the outside of fire damper sleeve
assemblies and wall/floor openings are:
• Galvanized steel fire dampers and sleeves:
of damper width and height with a minimum clearance of
1 /4
in. Recommended clearances, for width and/or height
dimensions of:
1 /2
1) 48 in. or less:
2) More than 48 in. and 96 in. or less: 1 in. clearance
3) More than 96 in.: 1
• Stainless steel fire dampers and stainless steel or
3 /16
galvanized sleeves:
height with a minimum clearance of
in. Recommended clearances, for width and/or height
dimensions of:
3 /4
1) 48 in. or less:
2) More than 48 in. and 96 in. or less: 1
clearance
3) More than 96 in.: 2 in. clearance
These are total clearances (ignoring fastener heads) and
do not need to be equally spaced around the damper.
Refer to Section 4 and Figure 6 for additional installation
considerations.
Example: A 12 in. x 12 in. damper would require a
minimum clearance of 1 /4 in.
A 48 in. x 12 in. damper would require a
minimum clearance of 1 /2 in. on width and
1 /4 in. on height.
MINIMUM SLEEVE THICKNESS FOR FIRE DAMPERS
Type of Duct to
Sleeve Connection
Rigid Round
Rectangular
Rigid Round
Rectangular
Breakaway Round or
(or no duct) Rectangular
Important Note:
Sleeve thickness must not be less than the gauge of the connecting duct.
U.L. Standard 555 requires all ducts to terminate at the fire damper sleeves or the damper frames.
Table 1: Minimum sleeve thickness for fire dampers.
1 / and 3 hour rated fire dampers mounted (blades must be horizontal) in masonry, block or stud walls
2
1 /8
in. per foot
in. clearance
1 /2
in. clearance
in. per foot of damper width and
1 /4
in., maximum of 2
in. clearance
1 /2
in.
Duct Duct Dimension
24 in. max. diameter
36 in. max. width or
24 in. max. height
over 24 in. diameter
over 36 in. width or
over 24 in. height
12 in. wide and under
13 in. - 30 in. wide
31 in. - 54 in. wide
55 in. - 84 in. wide
85 in. wide and over
2. GAUGES AND LENGTHS OF FIRE DAMPER
SLEEVES
All fire dampers must be installed in a steel sleeve of the
required gauge and length. See Table 1 for required
minimum sleeve gauges. Maximum sleeve thickness is 10
gauge. Sleeve inside dimensions must equal damper outside
dimensions.
Sleeves shall extend a maximum of 6 in. beyond the wall or
floor opening on each side ( see Figure 1). When an access
door is incorporated as a part of sleeve, the sleeve may
extend a maximum of 16 in. beyond the wall or floor opening
on the access door side.
3. ATTACHING FIRE DAMPERS TO SLEEVES
Fire dampers must be attached to sleeves as shown in
Figure 5. All four sides of the damper frame must be
attached to the sleeve with one row of attachments on each
side of the blade channel. Attachments must be spaced a
maximum of 6 in. on centers and a maximum of 2 in. from
corners. A minimum of 4 attachments (2 on each side of the
blade channel ) per side ( 16 per damper ) are required. One of
the methods of attachment shown below must be used.
• tack or spot welds
• #10 sheet metal screws
1 /4
• in. bolts and nuts
3 /16
• in. steel pop rivets
4. SECURING FIRE DAMPER AND SLEEVES TO WALL
AND FLOOR OPENINGS.
Fire damper and sleeve assemblies must be installed in wall
and floor openings using retaining angles on each side of the
wall or floor as described below:
• Retaining angles must be a minimum of 16 gauge steel with
1 /2 1 /2
minimum 1 in. x 1
greater than 48 in., retaining angles must be a minimum of
16 gauge steel with minimum 1
•
the sleeve using the procedures and
methods described in Section 3. The
angles must be attached to all 4 sides of
Sleeve Gauge
the sleeve with butt joints at each corner.
A minimum of two attachments are
required on each side, top and bottom.
16 (.060 in.)
The angles need not be attached to each
other at the corners.
•
cover the clearance space between the
14 (.075 in.)
sleeve and the wall / floor opening, plus
overlap the wall / floor a minimum of 1 in.
This coverage includes all corners (see
26 (.018 in.)
Figure 6).
24 (.024 in.)
•
22 (.030 in.)
fastened to the wall / floor material. The
20 (.036 in.)
angles should only sandwich the wall / floor
18 (.048 in.)
and allow for damper/ sleeve expansion
during periods of intense heat.
2
in. legs. For dampers with height
1 /2 1 /2
in. x 2 in. legs.
Retaining angles must be attached to
Retaining angles must completely
Retaining angles should not be