Firestopping, Attic Insulation Shield, Wall Support / Wall Band - DuraVent BV Installation Instructions Manual

Increaser
90° Elbow
Adjustable
Length
Type B
Vent
Draft Hood
Connector
FIG. 5 - Combined vent system using type B Parts
starting with Draft Hood Connectors.
7. FIRE STOPPING
All Type B Gas Vents passing through floors,
ceilings or walls must be firestopped using the
Firestop Spacer. The Firestop must close the
area between the outer wall of the pipe and
the opening in the structure. In areas such
as attics with no floor, the Firestop should be
placed on top of a properly framed opening.
KEEP WIRES AND INSULATION OUT OF
REQUIRED AIR SPACE AROUND GAS
VENT. When venting is supported with the
Support Plate it may serve as a Firestop. See
Section 12. For gas vents within a shaft or
chase, firestopping is provided by the vertical
walls of the shaft. Any openings in the chase/
shaft below the roof must be firestopped.
Firestop placed
on top of floor or
framed opening.
Firestop Spacer/Support
Plate to be framed on all
4 sides
FIG. 6 - Fire Stopping Required for all Ceiling/
Floor Levels
8
Common Vent
Tee
45°/60°
Increaser
Elbow
Type B
Vent
Firestop
Spacer/Support
Maintain minimum
airspace clearance
to combustibles,
wires and insulation
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
8. ATTIC INSULATION SHIELD
For diameters 3" to 8", install an Attic Insu-
lation Shield where the vent passes into an
attic space. It is designed to keep insulation
materials or debris from coming into contact
with the vent (see Figures 2, 3 & 4). It must
accomodate the amount of insulation as re-
quired by the National Building Code.
45°/60°
Elbow Where height restrictions will not permit the
use of the Attic Insulation Shield, it is per-
Draft
missible to construct an enclosure with a 1"
Hood
Connector
air space clearance to the outer pipe all the
way to the underside of the roof deck. In this
application you would install a Firestop Spacer
on the ceiling side.
For a proper installation, the opening must
be fully framed at 1" of clearance to the outer
wall of the pipe with framing material of the
same dimension as the ceiling or floor joist.
Install the AIS from above and secure base
with nails or wood screws.
Seal the vapour barrier to the firestop or
ceiling support assembly using a high tem-
perature silicone as per the requirement of
local authorities.
NOTE: For larger diameters (10" to 30") a
Firestop Support Plate must be used installed
in a fully framed opening at the required air
space clearances to combustible materials.
9. WALL SUPPORT/WALL BAND - FIGS
7 & 8
The Wall Support/Band is for use in supporting
35 ft. of vertical Model BV (3" to 8") and estab-
lishes the proper 1" clearance to wall to which
Plate
it is attached, used at maximum 8 ft. spacing.
May also be used to provide lateral support.
Firestop
Spacer
nailed in
FIG. 7 - Wall
place
Support/Band
#10x1-1/4" Wood Screw
(4plcs - to Wall)
1/4" #20x1-1/4"
Screw Nut
#8x1/4po Slotted
Hex Head Screw
at 3 holes if used
as a Support