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56131L
16
6. Make final connection to vent terminal.
Flush or recessed with short vent sys-
tem:
Vent system may be pre-sized. Check
for final fit and slide unit into framing with
firestop in place. This is helpful when using
rigid pipe and round vent termination. Vent
may be preconnected and slipped through
firestop. Make sure 45° connection at unit
is tight and does not come loose before
unit is nailed to framing.
Square vent or long vent configuration:
Vent pipe must be manipulated at outer
end to make final connection. Manually
secure pipe inside open framing. If this
is a retrofit installation in an inaccessible
space, you may have to secure outer
end of vent pipe with wall straps and tap
screws at outer end.
When using tap screws with rigid pipe,
be sure that screws do not penetrate
inner pipe. These procedures may also
be followed by flexible pipe installations.
To use flexible pipe, vent must be drawn
through end firestop, cut back to 6"-8" to
permit easy connection of flex termination
and connection must be slipped back into
and secured to installation. You must use
an adequate number of spring spacers at
ends and closest bend to termination to
prevent kinks or collapsing on the fire. Do
not use screws with flex pipe. Vent system
must be code inspected and released
before adding dry wall or other surface
treatments.
Figure 22 - Horizontal Termination
Configuration for Rigid Venting Using
One 90° Elbow
Horizontal Venting
Vertical (V)
Horizontal (H)
49.5" min.
17" max.
(45° elbow, 1' vertical pipe, 90° elbow)
60" min.
77" max.
72" min.
101" max.
84" min.
125" max.
132" min.
149" max.
Figure 20 - Installing Vinyl Siding
Standoff (Combustible Exterior Wall)
Cut Vinyl Siding
Away to Fit Standoff
Wood
Screw
Bolt
Standoff
Vent
Cap
Apply Mastic to
All Four Sides
Vent Cap (Horizontal
Termination)
Interior Wall
Surface
Interior Wall Firestop
(Combustible
Exterior Wall Only)
Horizontal
Vent Pipe
Figure 21 - Connecting Vent Cap with
Horizontal Vent Pipe
Screw
VENTING INSTALLATION
Continued
45° Starter
Elbow
Horizontal Termination Configurations
Figures 22 and 23 show different configura
-
tions for venting with horizontal termination.
Each figure includes a chart with vertical
minimum/maximum and horizontal maximum
dimensions which must be met. All horizon
-
tal terminations require 1/4" rise per 12" of
horizontal run. You must add 1/4" of vertical
height (V) in the following tables for each foot
of horizontal run (H).
