3.8.1.1 Single Opening Vented Cavity Option
Alternative Installations (cont.)
•
Figure 3.18 shows an alternative installation method where you
cap off the fireplace cavity so the air discharge opening can be
located further down the fireplace chamber. 1-1/2” (38mm) is
the maximum drop for framing the air discharge opening to the
fireplace enclosure top. This avoids trapping heat in the upper
areas of the vented cavity enclosure. Framing the outlet any
lower than 1-1/2” (38mm) will cause over heating create a fire
hazard. If you cap the fireplace cavity off, it cannot have any vent
pipe running through the top without a ceiling firestop. This
installation method can alleviate any possible concerns with
paint discoloration from heat or dust.
3” (76mm)
6”
(152mm)
2
½
”
(63mm)
1
½
”
(38mm)
MIN
Ceiling
MAX
MIN
Enclosure Top
Must Be Installed
Figure 3.18, Single Opening Vented Cavity Alternative Installation
VENTED CAVITY INSTALLATIONS ONLY
#CLW-40 R.3 November 2021
Hussong Mfg. Co., Inc. • Kozy Heat Fireplaces
FRAMING
27
