33
Double Wall Vertical Floor Support (Wood, Concrete, Steel)
1. Vertical floor supports are used when the duct system is passing through a floor opening. Vertical floor
support assemblies consist of two floor support plates and support bands. The support plates are used
to span the floor opening, the support bands connect the floor plates to the outer shell of the double
wall duct shell.
2. The floor opening is sized per the double wall duct outer shell. Verify the floor opening, refer to
Table 8 (grease duct) or Table 9 (chimney).
3. If there is an existing opening in the floor or chase, you must verify the opening. If the opening is larger
than the dimension referenced in Table 8 (grease duct) or Table 9 (chimney), you must re-frame the
opening or change to a chase support. Refer to Figure 22 for chase support details.
4. Chase supports are used when the floor opening is larger than the floor support plates and the floor
support plates cannot be secured to the floor.
5. Unistrut is bolted to the floor support plates (chase support). Refer to Figure 22 for details.
6. Unistrut is designed to span larger opening in floors when the opening cannot be changed.
NOTE: If there is an existing opening in the floor that exceeds 5” maximum clearance, then re-
frame the opening or use “Double Wall Vertical Ceiling Support” on page 32.
Table 7 - Substrate Hardware
Decking Material Hardware
Minimum Thread
Penetration
Minimum Edge
Distance
Wood - Minimum G.42
Zinc Plated Steel Hex Head Lag Screw
3/8” x 2-1/2” with 3/8” washer
2” 1-1/2”
Concrete - 2500 Minimum
PSI
Hilti Kwik Bolt
3/8” Diameter TZ Expansion Anchor with 3/8” washer
2-5/16” 3”
Steel Roof Truss
Dril-Flex Self-Drilling Screws
1/4”-14 Min. 1/2” Through with 1/4” washer
12 Gauge or
1/8” Thick
3/8”
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