Installing The Chimney System; 30° Offset Through Floor/Ceiling - Marco Builder Series Installation Instructions Manual

Step 4. 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 ( Figure 17 ).
8d Nail
Figure 17
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.

INSTALLING THE CHIMNEY SYSTEM

Step 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 1"* CHIMNEY
AIR SPACE TO COMBUSTIBLE FRAMING MEM-
BERS THROUGHOUT VERTICAL OR OFFSET
CHIMNEY INSTALLATION.
A minimum 1"* air space must be reserved for
all combustible materials extending for any
continuous length surrounding the chimney.
8
Reference Figures 15 and 16 and charts Fram-
ing 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 fire-
place.
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 18 ). Then plumb from ceiling or roof
level directly above hole which has just been
completed.
Figure 18
Step 3. Position appropriate firestop spacer at
ceiling and nail temporarily with two (2) 8d
nails. Use flat firestop spacer, Model F8FS-2, if
chimney penetrates ceiling vertically. If chim-
ney penetrates ceiling at 30° angle (offset chim-
ney), use 30° firestop spacer, Model F8FS30.
Use one nail on opposite sides to hold firestop
spacer in position. Nail permanently, using at
least two (2) more 8d nails, after chimney
sections have been assembled through the
firestop spacer and after any necessary adjust-
ments have been made. Firestop spacer must
be secured by at least four (4) 8d nails when
completely installed.
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
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 19 and 20 ).
Room Above
Figure 19
Attic Above
Firestop Spacer
Figure 20
CHIMNEY 30° OFFSET THROUGH FLOOR
OR CEILING
It may be necessary to assemble the chimney at
30° when passing through the floor or ceiling
area. Use the F8FS30 firestop spacer as shown
in Figures 21 and 22 . Support the chimney at
floor or ceiling penetration with a FTF8 stabi-
lizer if distance of chimney below ceiling is 10'
or more. Maintain 1"* minimum air space to
combustibles from chimney sections.
*Note: 2" clearance to combustibles required
in Canada.
Firestop Spacer