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Figure 7.13 Insert Bolt into Brackets
• Slide the assembled storm collar down the pipe section
until it rests on the roof flashing. See Figure 7.13.
• Tighten nut and make sure the collar is tight against the
pipe section.
• Seal around the top of the storm collar. See Figure 7.14.
Install Vertical Termination Cap
• Attach the vertical termination cap by sliding the inner
collar of the cap into the inner flue of the pipe section
while placing the outer collar of the cap over the outer
flue of the pipe section.
• Secure the cap by driving three self-tapping screws
(supplied) through the pilot holes in the outer collar of
the cap into the outer flue of the pipe. See Figure 7.14.
TERMINATION CAP
(1 OF 3)
SCREWS
SEAL
Figure 7.14
Heatilator • NNXT33-IFT, NNXT33L-IFT, NNXT36-IFT, NNXT36L-IFT Installation Manual • 2628-980 Rev. C • 8/20
F. Horizontal Termination Requirements
Heat Shield Requirements for Horizontal
Termination
WARNING! Risk of Fire! To prevent overheating and fire,
heat shields must extend through the entire wall thick-
ness.
• DO NOT remove the heat shields attached to the
• Heat shields must overlap 1-1/2 in. (38 mm) mini-
There are two sections of the heat shield. One section
is factory-attached to the wall shield firestop. The other
section is factory-attached to the cap. See Figure 7.15.
If the wall thickness does not allow the required 1-1/2 in.
(38 mm) heat shield overlap when installed, an extended
heat shield must be used.
• If the wall thickness is less than 4 in./102 mm (DVP)
or 4-3/8 in./ 111 mm (SLP), the heat shields on the cap
and wall shield firestop must be trimmed. A minimum
1-1/2 in. (38 mm) overlap MUST be maintained.
• Use an extended heat shield if the finished wall
thickness is greater than 7-1/4 in. (184 mm).
• The extended heat shield may need to be cut to length
maintaining sufficient length for a 1-1/2 in. (38 mm)
overlap between heat shields.
• Attach the extended heat shield to either of the existing
heat shields using the screws supplied with the extended
heat shield. Refer to vent components diagrams in the
back of this manual.
• Rest the small leg on the extended heat shield on top
of the pipe section to properly space it from the pipe
section.
Important Notice: Heat shields may not be field constructed.
STORM
COLLAR
wall shield firestop and the horizontal termination cap
(shown in Figure 7.15).
mum.
41
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