GC150 Series Direct Vent GAS Appliance

2.Preparing the ceiling for firestop spacers. Mark and cut out an opening in the ceiling for the firestop spacer. Frame the opening with the same size lumber used in the ceiling joists. Unless the flue if offset, frame the 10" x 10" opening directly over the firebox.

3.Installing the firestop spacers. Firestop spac- ers must be used whenever the venting penetrates a ceiling/floor area.

In all situations, firestop spacers are to be nailed to the ceiling joists from the bottom or fireplace side, EXCEPT when the space above is an insulated ceiling or attic space. In this situation, the firestop spacer must be nailed from the top side to prevent loose insulation from falling into the required one inch air space around the vent system. See Figure 13.

Install the firestop spacer (FS6) by positioning and nailing the four sides of the firestop spacer to the joists using a minimum of three nails per side.

4.Securing vent system. Continue assembling the vent sections up through the firestop spacers as needed. vent sections must be locked into posi- tion with the screws provided, using the predrilled holes. The 15942B starter elbow and the vent sta- bilizers have straps for securing these parts to joists or rafters.

Note: Be sure to provide intermediate sup- port for the vent during construction and check to be sure inadvertent loading has not dislodged the vent from the appliance or any vent joint.

6.Marking the exit point in the roof. Locate the point where the venting will exit the roof by plumbing down to the center of the vent. Drive a nail up through the roof to mark the center. See Figure 15.

7.Cutting out the hole in the roof. Measure to either side of the nail and mark the 10" x 10" open- ing required. This is measured on the horizontal; actual length may be larger depending on the pitch of the roof. Cut out and frame the opening. See chapter 25 of the Uniform Building Code for Roof Framing details. A one inch minimum air space clearance must be maintained between the chim- ney section and the roof.

8.Install roof flashing or site-produced chase top. Position a roof flashing or a site-produced chase top and secure in place with nails.

9.Assembling vent sections. Continue to add vent sections through the roof opening, maintaining at least a one inch air space clearance. If a specif- ic height is desired, the chimney sections may have to be cut (using shears) to a certain length.

Figure 13

Installing the firestop spacer

Figure 14

Ceiling and attic construction

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GC150 specifications

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