Step 4. Two sets of nailing tabs have been provided. One set of four is to accommodate ⁵⁄₈" drywall and the other set is for ¹⁄₂" drywall.
To insert the unit into prepared framing, bend the four nailing flanges adjacent to one of the fireplace faces completely over 180 degrees until they are flush with the cabinet. Bend the remaining nailing flanges adjacent to the opposite face out 90 degrees (see Figure 18 ). Slide the unit through the framed opening with the face adjacent to the flanges bent fully over 180 degrees, inserted first.
Slide the unit into the prepared framing until the unit is centered between the walls. Fold the nailing tabs back against the framing, level the unit with shims as necessary and secure the fireplace to the side frame members with 8d nails or screws as appropriate.
Framing
Stud
Nailing
Flange
Figure 18
Note: The nailing tabs are exempt from the fireplace clearances described on the fireplace clearance label.
INSTALLING THE CHIMNEY SYSTEMStep 1. Check flue damper for proper opera- tion. To open, pull handle down and release. Damper will open automatically. To close, push handle up. The damper should lock into the closed position.
Note: The damper is set to one opening, but may be switched if necessary.
Step 2. Using standard construction framing techniques, construct opening for chimney route up through the ceiling(s) and roof or through an outside chase.
Framing must maintain adequate minimum air space clearance at all times.
CAUTION: ALLOW MINIMUM 2" (51 MM)
CHIMNEY AIR SPACE TO COMBUSTIBLE FRAMING MEMBERS THROUGHOUT VERTICAL OR OFFSET CHIMNEY INSTALLATION. ALSO MAINTAIN AIR SPACE ON TOP OF THE FIREPLACE AS DEFINED BY THE SPACERS AND STANDOFFS.
A minimum 2" (51 mm) air space must be reserved for all materials extending for any continuous length surrounding the chimney.
See Figures 26 and 27 and charts “Framing Dimensions for Ceiling and Roof” on page 10, which specify minimum ceiling and roof di- mensions.
For new construction, to determine chimney center line, use plumb line from roof or ceiling above fireplace to center of flue collar on fireplace.
For remodeling, plumb to center of flue collar from ceiling above, drive nail through ceiling from below to mark position, then mark and cut to passage from above ceiling (around nail) (Figure 19 ). Then plumb from ceiling or roof level directly above hole which has just been completed.
Plumb Line
Figure 19
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
Step 3. Position appropriate firestop spacer at ceiling and nail temporarily with two (2) 8d nails. Use flat firestop spacer, Model
Note: If there is a room above ceiling level, firestop spacer must be installed on the bottom side of the ceiling. If an attic is above ceiling level, firestop spacer must be installed on top side of ceiling joist (Figures 20 and 21).
Room Above
Firestop Spacer
Figure 20
Attic Above
Firestop Spacer
Figure 21
Step 4. Note: Chimney sections are constructed with a unique locking tab design which ensures an immediate, tight assembly between sections. Plan your chimney requirements carefully before assembly as chimney is difficult to disassemble after installation. If disassembled, the tabs might become dam- aged. Be certain tabs are properly formed to ensure tabs engage properly.
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