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Type of Duct to
Sleeve Connection
Rigid
Rigid
Breakaway
(or no duct)
Important Note: Sleeve thickness must not be less than the gauge of the connecting duct.
UL Standard 555 requires all ducts to terminate at the fire damper sleeves or the damper frames.
Our Commitment
As a result of our commitment to continuous improvement, Greenheck reserves the right to change specifications
without notice.
Product warranties can be found online at Greenheck.com, either on the specific product page or in the
literature section of the website at Greenheck.com/Resources/Library/Literature.
®
Phone: 715.359.6171 • Fax: 715.355.2399 • Parts: 800.355.5354 • E-mail: gfcinfo@greenheck.com • Website: www.greenheck.com
2
463543 • Field Installed Sleeve, Rev. 7, January 2022
Minimum Sleeve Thickness for Fire Dampers
Duct
Round
24 in. (610mm) max. diameter
Rectangular
36 in. (914 mm) max. width or
24 in. (610mm) max. height
Round
over 24 in. (610mm) diameter
Rectangular
over 36 in. (914 mm) width or
over 24 in. (610mm) height
Round or
12 in. (305 mm) wide and under
Rectangular
13 in. - 30 in. (330 mm - 762 mm) wide
31 in. - 54 in. (787 mm - 1371 mm) wide
55 in. - 84 in. (1397 mm - 2134 mm) wide
85 in. (2159 mm) wide and over
Table 1: Minimum sleeve thickness for fire dampers.
Duct Dimension
in. (mm)
Copyright 2022 © Greenheck Fan Corporation
Sleeve Gauge
16 (.060 in.)
[1.5 mm]
14 (.075 in.)
[2 mm]
26 (.018 in.) [.46 mm]
24 (.024 in.) [.6 mm]
22 (.030 in.) [.76 mm]
20 (.036 in.) [.9 mm]
18 (.048 in.) [1.2 mm]
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