Retrotec RSH Pressure Relief Vents - Manual (Page 8)

QG700 Page 8 of 8 rev-2010-08-13
FITTING AN RSH SERIES PRV INTO A THIN PARTITION OR FIRE
DOOR USING A Z FRAME
For installations where the PRV is to be fitted into a door or
partition that is under 4 inches (110mm) thick for internal use
or under 1 1/2 inch (160mm) for external use, the addition of
a Z frame is needed.
a) Cut a hole into the door or stud partition 1/2 inch (12mm) bigger than the size of the casing of
the PRV. (check orientation, holes will not be square) (before fitting into doors assess that once
fitted, the door will open correctly. This can be a particular problem if the door opens against a
90°wall such as a hallway. Do not compromise any safety regulations all building and fire codes
must be adhered to as to the correct aperture required for doorways.
b) If the PRV is to be fitted into a stud partition then 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 of the wall.
c) Drill 8 of 5/32 (4mm) fixing holes 4 inches (100mm) from each corner and thereafter at 8 inch
(200mm) intervals. Run a bead of intumescent fire-rated caulk around the face of the wall
or door opening so as to form a seal under the PRV flange and using 1 inch (25mm) (for doors)
and 2 inch (50mm) (for walls) no. 6 steel screws fix the PRV into the hole. (NOTE: Do not try to
force into a hole that is not cut correctly cut, distorting the body of the PRV can affect its
performance and will nullify any warranty. It is also essential that the PRV is fitted upright.
3° either way is acceptable.)
d) On the Z Frame, drill 8 of 5/32 inch (4mm) fixing holes 4 inch (100mm) from each corner and
thereafter at 8 inch (200mm)intervals. Run a bead of intumescent fire-rated caulk around the
face of the wall or door opening so as to form a seal under the Z Frame flange and using 1 inch
(25mm)(for doors) and2 inch (50mm) (for walls) no. 6 steel screws fix the Z Frame onto the back
of the door/wall to cover the PRV.
e) Check that each and every blade of the PRV opens freely. If blades are rubbing against the side
casing check to make sure the frame of the PRV has been fitted square and is not twisted in any
way and there is no part of the wall opening that is jamming on the vent casing. (it may be
possible to free slightly rubbing blades by tapping out casing where they touch, with a hammer).
f) Using 1 inch (25mm) tech screws fix the internal grill over the PRV. Using 1 inch (25mm) tech
screws fix the external grill/louver/shutter onto the Z Frame.