50
25
25
Air Ventilation Through Chimney Chase
Air Ventilation Through Top Flashing
D
raw
ings
No
tTo
Sc
al
e
Non combustible material
Hebel Block or
12 mm Promatect H board
or similar under the flashing
Oversized casing cover
is necessary
150 mm
minimum
150 mm
minimum
Spigot flashing to suit
flue pipe casing
Drip
Line
Drip
Line
flue pipe
flue pipe casing
25
25
Fig. 20
Typical Cowl
Casing Cover
Air Gap
Top Spider
Approved
Flashing
Air
Vents
min 2 x 80mm dia
or equal square or
rectangle shaped
area
min 25mm gap between flue
pipe casing & combustible
surface
EXTERNAL REQUIREMENTS – SOLID FUEL
Refer to AS/NZS2918:2001; 4.9.1
Note:
All external air vents &
ceiling penetrations must be bird
& rodent proofed with permanently
fixed screens
D
raw
ing
No
tTo
Sc
al
e
Minimum 25mm gap between
flue pipe casing
& combustible surface
Air Vent
min 2 x 80mm diam. or equal square or rectangle shaped area
Promina Board or similar
Hebel Block
Note:
All external air vents & ceiling penetrations must be bird & rodent proofed with permanently fixed screens
Fig. 21
Fig. 22
FLUE PENETRATION
CHIMNEY CHASE AIR VENTILATION
6.TMWG.14
EXTERNAL REQUIREMENTS – GAS
Refer to AS/NZS 5601:2013
