FloAire Non-Welded Grease Duct Systems User Manual
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Fig. 8 – Horizontal Support Details
IMPORTANT: VERTICAL & HORIZONTAL SUPPORTS SHOWN IN THIS MANUAL ARE
RECOMMENDED. SUPPORTS BY OTHERS MUST BE APPROVED BY THE MANUFACTURER AND
AHJ. SUPPORT SPACING MUST BE AS STATED IN THIS MANUAL.
Wall Guide Support & Support Vertical Spacing
The wall guide is to be attached to Non-Combustible and Combustible surfaces. The wall guide is
constructed of 12 gauge steel and is comprised of a full ring, brackets, angle struts, wall support plates and
hardware for assembly (Includes mounting hardware to secure supports to gypsum walls constructed using
25 gauge steel studs), see Fig. 9. The ring, which is split in two halves for ease of assembly, is constructed
of 12 gauge steel. With the addition of a spacer between the two halves, the diameter is 1/8” larger than the
outside diameter of the duct. This is to allow for thermal expansion.
The wall support should be installed at the joint of the duct and below the “V” clamp so the “V” clamp moves
away from the support ring. The wall guide assembly is designed for 2 to 18 inches clearance from duct to
non-combustible / combustible walls. The side struts may be placed either up or down as is convenient. This
assembly is intended to resist lateral or side loads only and is not for carrying the weight of the vertical
grease duct. The horizontal struts allow for attachment to the wall after the grease duct has been positioned.
The angle of attachment may vary as needed for the duct to wall clearance. Wall supports shall be used at
the proper spacing shown in Table 4 for vertical duct support, with appropriate expansion joints to allow for
thermal expansion and wall guides for lateral stability.
Table 4 – Vertical Support Spacing
DIAMETER VERTICAL SUPPORT SPACING (FEET)
8"
10'
10"
10'
12"
10'
14"
10'
16"
10'
18"
10'
20"
10'
24"
10'
See table 3
Angle / Unistrut
Duct
Duct Wrap
Inner Layer
6" Collar
OD + 4"
3/8" Threaded Rod
Duct Wrap
Outer Layer