Hearth and Home Technologies CNXT4236ILT, CNXT4842ILT, CNXT4842IH Disassemble Vent Sections

E. Disassemble Vent Sections	• Use a plumb-bob to mark the center line of the venting
• Rotate either section (see Figure 10.11) so the seams	system on the ceiling and drill a small hole through the
	ceiling and roof at this point. Locate the hole and mark
on both pipe sections are aligned as shown in Figure
	the outline of the cathedral ceiling support box on the
10.12.
	outside roof.
• Pull carefully to separate the pieces of pipe.
	• Remove shingles or other roof covering as necessary
	to cut the rectangular hole for the support box. Cut the
	hole 1/8 in. (3 mm) larger than the support box outline.
	• Lower the support box through the hole in the roof until
	its bottom is at least 2 in. (51 mm) below the ceiling
	(Figure 10.13).
	• Level the support box both vertically and horizontally
	and temporarily tack it in place through the inside walls
	into the roof sheathing.
	• Use tin snips to cut the support box from the top corners
	down to the roof line and fold the resulting flaps to the
	roof. See Figure 10.14.
	• Nail the flaps to the roof AFTER running a bead of non
	hardening sealant between the flaps and the roof.
	WARNING! Risk of Fire! Clean out ALL materials from
	inside the support box and complete the vertical vent run
Figure 10.11 Rotate Seams for Disassembly	and termination.
			Level
			Cathedral ceiling
			support box
				2 in. (51 mm)
				minimum below
				finished ceiling
		Cut hole 1/8 in. (3 mm) greater
Figure 10.12 Align and Disassemble Vent Sections
		in size than pattern of support
		box as it is projected onto
		roofline.
F. Install Decorative Ceiling Components
(SLP only)	Figure 10.13

A decorative ceiling thimble can be installed on a flat ceil-
ing through which the vent passes. The decorative ceiling
thimble is used to cover the firestop, which is installed
according to section 8.C.
• Seal the gap between the vent pipe and firestop
using high temperature silicone to prevent cold air
infiltration.
• Install the decorative ceiling thimble by sliding it up to
the ceiling and attaching it using the provided screws.
A decorative black cathedral ceiling support box can be
used where vertical vent runs pass through a cathedral
ceiling.
Figure 10.14
Heatilator • Caliber CNXT Series • 4047-132 Rev U • 11/08	45