use
Dual-function product acts as a
cavity ventilator permitting the
cavity to breathe.Also acts as a
weep to evacuate water from
lintels,dpc ’s and cavity trays.
introduction
The Type W may be used to
provide the balanced air
conditions demanded within the
cavity in timber-frame
construction.The equivalent
airflow of an open perp is
required every 1.5 metres around
the base of the cavity walls and
around the top of the same walls.
Where such wall cavities are
closed or compartmented with
the presence of horizontal fire
stops or similar,ventilation
apertures are required below and
above such stops.
Type W cavivents are designed
for such purposes.Type W
cavivents are available in a range
of colours to blend with the
adjacent mortar or masonry.
To the front of each Type W is an
insect resistant grille,whilst within
the body of the ventilator are
baffles to diffuse the effects of
directly-blowing winds.Type W
cavivents may be used to satisfy
the requirements of cavity
ventilation.
data
•Size 105/115mm x 65mm x
10mm.
•Free airflow 320mm˛.
•Use every third or forth brick to
provide compliant balanced
ventilation.
•BS polypropylene.
•Colours:grey,black,beige,
brown,terracotta,white and
translucent.
•Packaged in boxes containing
50no.
|
