11. Anti-smoke flap
12. Installation in a large-sized
hearth
opened. For installation details, see
Drawing 27.
11.1 Anti-smoke flap (optional):
This part is
used when the flue draught is not sufficient or
when there is a negative pressure in the house.
The anti-smoke flap will prevent the smoke from
spilling into the room when the insert door is
12.1 Non-combustible materials
(Drawing 9
:
Use only 100% non-combustible materials to
reduce the area of an over large hearth. When in
doubt, don't hesitate to contact Don-Bar.
12.2 Metal framing:
Use only metal studs
to
f
rame the hearth. Allow for thermal expansion by
cutting all studs 1/8" (3 mm) shorter than
necessary.
12.3 Insert must be removable:
The insert must
always be easily removable from the hearth.
Provide a 2" (50 mm) free space between all
metal studs and the ventilated finishing frame. Do
not secure metal studs to the insert or to its
finishing frame.
12.4 Non-combustible finishing materials
(Drawing 9)
:
Use only 100% non-combustible
composite cement boards (Durok or equivalent).
Fill the joints or cover the boards with ceramic
tile.
Page 12
100% non-combustible
composite cement
board (Durok or
equivalent). Finish
by filling joints or
recover with ceramic
tiles, at choice.
Ventilated frame
Metal studs
IMPORTANT: Allow
for thermal expansion.
Cut all the studs 1/8"
(3 mm) shorter than
necessary
Don't secure the
insert to the studs.
Provide a 1"
(25 mm) free
space between
the metal framing
and the insert.
The insert must
always be
removable.
Non-combustible
floor protection
(See Drawing 7
for minimum
dimensions)
DRAWING 9
Framing a large-sized hearth
REV. 2014-11
