Spiral
duct is produced by
winding zinc galvanized
sheet with width 135mm,thickness
0.5~2.3mm in spiral
form as like following
picture and finishing
by seam welding, which
makes joint folded
by 4 sheets and this
provides high strength,
elasticity and higher
resistance to outer
pressure
and smoothened joint
reducing friction
loss makes this pipe
lighter.
-
This
pipe is very thin
and light compared
to other pipes and
so it saves not only
material cost but
also strength and
extra cost for construction.
-
Even
person not professional
can construct and
because there is no
limit to length for
construction, it can
be installed by free
adjustment.
-
Strength
degree of outer rib
of straight duct is
high and it has long
lifetime.
-
Connection
and attachment are
easy.
-
Interior
side is smooth and
so it is superior
in efficiency of friction
loss and leakage of
wind.
-
Air-conditioning,
combustion passage
for boiler, conveyer
of air, ventilation
pipe, protection of
heat-retaining pipe
-
Temporary
drainage pipe, pipe
for collecting water,
pipe for scattering
concrete on site,
civil engineering
and construction
