Step 5. Fireplace should be secured to side framing members using the full length nailing tabs at the top and bottom of the fireplace front face. Use 8d nails or equivalent (Figure 18 ).
Framing Stud
Nailing Tab
8d Nail
Figure 18
Note: The nailing tabs and the area directly behind the nailing tabs are exempt from the clearances described on page 5. Maintain at least 1/2" clearance from the firebox wrapper to the framing at the closest point of contact, directly adjacent to the flange.
For Canadian InstallationsProceed with StepsStep 6. Remove one of the knockouts from the fireplace transition and attach the 4" (102 mm) collar from the air kit to the transition with four
(4) No. 8 x ¹⁄₂" screws provided (Figure 19 ).
Optional
Connection
Chimney
Air Kit
Figure 19
Step 7. Connect the 4" (102 mm) Class 0 air duct to the collar with two (2) No. 8 x ¹⁄₂" screws provided in the hardware kit.
Step 8. Route the Class 0 air duct out the back wall or side wall, up through the ceiling or floor joists to an outside wall. The air duct should be located above snow level.
8
Note: If the fireplace is installed against an inside wall, the Class 0 air duct may be extended into a ventilated attic space at least 18" (457 mm) above the attic floor. Secure the duct hood to a vertical post with the inlet positioned downward. Ensure nothing blocks the hood opening. This air duct must never terminate higher than the chimney.
Step 9. Cut or frame hole through the outside wall for the installation of the duct inlet hood. A 4 ¹⁄₂" (114 mm) diameter hole is sufficient. Feed the loose end of the flexible duct through the hole cut for the inlet hood and attach to collar on inlet hood using two (2) No. 6 x ³⁄₈" screws provided. Insert hood into opening. Secure hood in place with the No. 8 x 1 ¹⁄₂" screws provided or with nails driven through holes in hood flange. Seal with noncombustible waterproof silicon type caulking. If additional duct is needed, use Class 0 metallic duct.
INSTALLING THE CHIMNEY SYSTEMStep 1. Before continuing, check the operation of the damper, as described on page 4, (refer to Figure 3 ).
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" CHIMNEY AIR SPACE TO COMBUSTIBLE FRAMING MEMBERS THROUGHOUT VERTICAL OR OFFSET CHIMNEY INSTALLATION.
A minimum 2" air space must be reserved for all combustible materials extending for any continuous length surrounding the chimney.
Reference Figures 16 and 17 and charts Framing Dimensions for Ceiling and Roof, which specify minimum ceiling and roof dimensions.
In 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 20 ). Then plumb from ceiling or roof level directly above hole which has just been completed.
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
Plumb Line
Figure 20
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 21 and 22 ).
Room Above
Firestop Spacer
Figure 21
Attic Above
Firestop Spacer
Figure 22