Retrotec RSH Pressure Relief Vents - Manual (Page 3)

QG700 Page 3 of 8 rev-2010-08-13
d) The opening must be framed out with similar studs that the wall is made from, e.g. if cutting into
a 2hour fire rated wall with steel studs then steel studs must be used to frame the hole so as to
maintain the 2 hour fire rating. The frame must then be lined with Plasterboard.
e) Mark the flange through which the fixing screws will seat into the framing studs.
Drill 8 of 5/32 inch (4mm) fixing holes 4 inches (100mm) from each corner and thereafter at 8
inch (200mm) intervals. (At this stage it is worth dry fixing the PRV with a couple of screws and
check that the wall liner will fit in and over the back of the PRV from the opposite side).
Please note: It is essential that the unit is fitted square. (Do not try to force into a hole that is
not cut correctly. Distorting the body of the PRV can affect its performance. It is also essential
that the PRV is fitted vertical/plumb. 3° either way is acceptable).