Stuv 21 - Option: Airtight Box

29
4
INSTALLATIONSTÛV 21
Ø6"
Ø4"
Ø4" or Ø6"
Ø4"
Ø6"
.3 OPTION: AIRTIGHT BOX
Option 1 Without airtight box
Option 2 The airtight box with an external
air inlet and air damper.
SUB-OPTIONS
1.1 A 12 sq. in. opening in the wall near the
fireplace. The underside of the fireplace
must allow air circulation and the room
must not be airtight.
1.2 (not recommended) Use the
outside air connection kit to supply air
under the fireplace. The area under the
fireplace needs to be insulated with non-
combustible materials to prevent cold air
from entering the room.
2.1 Use the outside air kit to connect the
ambient air to the airtight box. Grille not
included.
2.2 (recommended) Use the outside air
connection kit to connect the outside air
to the airtight box. It is recommended to
make a loop in the wall with the duct to
avoid condensation.
COMBUSTION AIR
Linear access to the front of the
fireplace feeds the combustion air that
will be expelled through the chimney.
!
1
2
1.2 2.1 2.2
Ø6”
1.1
RECOMMENDED
!
NOTICE
Refer to the damper manual if this
option have been selcted.
!