Installation Instructions

PI-EZINS 12/16/14
Clearance to Combustibles and Framing Requirements
Table 1 shows the required MINIMUM AIRSPACE CLEARANCE TO COMBUSTIBLES. “Combustibles” include
framing lumber, drywall, plywood, paneling, insulation, wiring and other building materials. This airspace
clearance is required for safe operation of the vent. Failure to follow these clearances could overheat the building
materials and could cause fire.
Max Appliance
Flue Gas
Temperature
V
ertical Horizontal
V
ertical Horizontal
3" & 4" 480°F 4" 8" 1" 1"
3" & 4" 550°F 4" N/A 1" 1"
400°F 4" N/A 1" 1"
480°F 5" N/A 1" 1"
550°F 6" N/A 1" 1"
Pipe Size
Minimum Clearance
Enclosed Vent Unenclosed Vent
5"
Table 1. Minimum Clearance to Combustibles
Note: 5” Vent is not to be installed horizontally in a fully enclosed combustible enclosure.
Vertical (Floor, Ceiling and Roof) Penetrations
Where the vent passes through a floor, ceiling or roof the hole size or framing dimension must maintain minimum
clearances per Table 1. Floor and Ceiling penetrations require a Fire Stop be installed. See Fire Stop section for
installation instructions.
Horizontal (Wall) Penetrations
All horizontal systems passing through a combustible
wall require the use of a Wall Thimble. See Table 2 for
proper framing dimensions and refer to Wall Thimble
section for installation instructions. Non-combustible
wall penetrations do not require a Wall Thimble.
TYPICAL INSTALLATIONS
Horizontal Support
Combustible
Enclosure
Rain Cap or other Termination
Flashing & Storm Collar
Firestop
Unenclosed Attic
See Table 1. (Min.
Clearance for Unenclosed
Vertical Vent)
See Table 1. (Clearance for
Enclosed Vertical Vent)
Fig 1. (Vertical Termination)
See Table 1.
(Clearance for
Unenclosed
Horizontal Vent)
See Table 1.
(Clearance for
Unenclosed
Vertical Vent)
See Table 1. (Clearance for
Enclosed Horizontal Vent)
See Table 2. (Min.
Framing Dimension for
Wall Thimble)
Fig 2. (Horizontal Termination)
Wall Thimble
Termination
Elbow
Firestop
Firestop &
Support Clamps
Support Clamps
Pipe
Minimum Framing Dimensions
Size Wall Thimble
3" 6.5" x 6.5"
4" 6.5" x 6.5"
5
"
10" x 10
"
Table 2. (Minimum Framing Dimension)