CaptiveAire DW - Through Penetration and Fire Stops

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Through Penetration and Fire Stops
Through floor fire stop support assemblies are used to support duct sections that penetrate a fire resistant
floor(s). The full support ring is installed under the double V-band; the struts are connected to the support
ring with supplied 5/16”-18 hardware. Once the struts have been connected, they are secured to the floor
using appropriate type and size fasteners supplied by others. The fire stop support is designed to support
the penetrating duct section and maintain annular distance, see Figure 26.
When duct systems penetrate a fire resistance rated floor, ceiling and/or a wall, a fire stop kit is used to
retain the fire resistance rating on the floor and/or wall. The double wall grease duct (2R, 3R and 3Z) and
the fire stop assemblies detailed below have achieved 2-hour ratings for integrity, insulation and stability.
Testing was conducted in accordance with the applicable requirements UL 2221, Test of Fire Resistive
Grease Duct Enclosure Assemblies.
Table 8 - Opening Size through Penetrations Grease Duct
Duct Model Inner Diameter Outer Diameter
Square/Round Opening
Min/Max
DW - 2R 8” 12” 14” - 15”
DW - 2R 10” 14” 16” - 17”
DW - 2R 12” 16” 18” - 19”
DW - 2R 14” 18” 20” - 21”
DW - 2R 16” 20” 22” - 23”
DW - 2R 18” 22” 24” - 25”
DW - 3R / 3Z 8” 14” 16” - 17”
DW - 3R / 3Z 10” 16” 18” - 19”
DW - 3R / 3Z 12” 18” 20” - 21”
DW - 3R / 3Z 14” 20” 22” - 23”
DW - 3R / 3Z 16” 22” 24” - 25”
DW - 3R / 3Z 18” 24” 26” - 27”
DW - 3R / 3Z 20” 26” 28” - 29”
DW - 3R / 3Z 22” 28” 30” - 31”
DW - 3R / 3Z 24” 30” 32” - 33”
DW - 3Z 30” 36” 38” - 39”
DW - 3Z 36” 42” 44” - 45”