frames, self cleaning drainage systems, flashing,electric
winder assembly and bird wire. Lineal vents shall be manufactured
The vents shall have a throat width as noted on drawings.
The throat refers to the free area. This free exhaust area
shall be maintained by the stack opening and with both dampers
open. At no point shall the free exhaust area of the vent
be less than the normal throat size.
vents shall be constructed of *Zincalume * Colorbond* to match
normal operating conditions, rain shall not enter the throat
when dampers are open. When closed, twin side dampers shall
be rigid and provide a durable seal to prevent the entry of
all wind driven rain, spray drift and dust. Self cleaning
drainage system shall be designed so that all rain, dust leaves
etc are completely removed from the vent unit onto the roof.
stack flashing to the vent shall have a minimum 200mm cover,
and sealed to the roof with a continuous profiled seal. Flashing
at the stop end shall also have a minimum 200mm cover. The
stop end to the lineal vent is to be silicone sealed to the
stack cap on site after installation.
vents shall be designed to resist wind loads resulting from
**41 metres per second wind in non cyclonic areas** 69 metres
per second wind in cyclonic areas** as outlined in AS 1170
shall be controlled by the manufacturers recommended electric
motors. The electrician shall supply a press button switch.
the switch shall clearly indicate by means of light when the
dampers are open or closed. Refer to drawings for location
in accordance with manufacturers recommendation.