The sharp 90° bend is an anti-blocking device, rather like the u-bend
under a sink - this MUST be located immediately behind all inlets
(including VacPans) to stop anything that could block-up the system. Any
debris that can’t get past is then easily extracted by opening the inlet and
hooking it out.
Occasionally, if you are putting the pipe through a solid wall, it will not be
possible to position the sharp 90° bend right behind the inlet, in which
case it should be the first bend on the other side of the wall.
There are also rare situations where the plasterers have been a little too
generous with the plastering and the inlet won’t reach the mounting
plate. You may therefore need to order an inlet valve extension from us
(code 2020) to fit into the mounting plate before you can fix the inlet on
the wall satisfactorily.
RULE 5
SHARP 90° BEND: behind every inlet
Sharp 90°
Bend
Sweep 45°
Bend
Sweep 90°
Bend
FIRST FITTING TO BE BEHIND INLET
15
NEVER
LOCATE
A
SHORT
90°B
END
ANYWHERE
ELSE
IN
THE
DUCT
RUN
APART
FROM
BEHIND
AN
INLET
. A
S
AN
ANTI
-
BLOCKING
DEVICE
DEBRIS
MAY
BE
STOPPED
HERE
AND
YOU
WON
’
T
BE
ABLE
TO
HAVE
ACCESS
TO
CLEAR
A
BLOCKAGE
.
NB: I
F
THIS
BEND
IS
PUT
ELSEWHERE
IN
THE
SYSTEM
,
THE
LIFETIME
GUARANTEE
AGAINST
BLOCKAGES
WILL
BE
MADE
INVALID
.
