Ravenscroft BSD-PW Installation Instructions

Important:
The following instructions refer to mounting the BSD-PW fire damper in plasterboard (Gib) wall
applications. AS1682.2-1990 requires fire dampers to be installed in the same method as
tested. These installation details are derived from the test.
The Australian & NZ Building Codes require fire dampers to comply with AS 1682-1990 Part 1 & 2,
and AS1530.4-1990 as the Acceptable solution. The BSD-PW complies with the Australian & NZ
Building Codes as an Alternative solution (incorporating AS1682 as a guideline). Verification as
follows: BRANZ Test No. FP2376 results confirm the plasterboard mounting system for the
BSD-PW will satisfy AS1530.4 -1990 for 120 minutes.
BSD-C fire dampers have been tested for installation in masonry walls & floors overseas and have
achieved a fire rating of 2 hours. Refer to Ravenscroft's for further detail. Separate installation
instructions are available for concrete/masonry wall options. Do not use the BSD-PW for ceilings
without consultation with Ravenscroft's.
Wall & Hole Preparation Instructions:
• The BSD-PW fire damper unit mounts into a wall cavity hole and is secured with approved
fasteners only. Supporting framework within the wall cavity is not required. The BSD-PW can
also be fastened to both the wall framing and plasterboard. This is recommended where possible
to insure a more robust installation.
• The 400 BSD-PW have mounting flanges sized to overlap a 600 mm stud spacing. The damper
would then screw directly into the studs with intermediate fasteners into plasterboard.
• When checking the location of the duct penetration, check that there is adequate space for the
flanges and where the framing is. Refer to the following table for damper, hole and flange sizes.
BSD-PW Hole
Size Diameter
125 165
150 190
175 215
200 240
• Use the radius guide provided to mark from the hole centre outwards to the hole diameter. Also
mark the diameter of flange corner fastener holes. This is important to ensure the damper can be
located in the centre of the hole with a concentric expansion space all around.
• Once the damper centre location is found, use a long drill to mark the centre of both sides of the
wall simultaneously. This damper flange system will not accommodate any misalignment. It is
therefore very important that the centre pilot holes are drilled perpendicular to the wall.
• Holes must be cut accurately with a jig saw or a key hole saw. The hole sizes listed include
suitable clearance for expansion. Holes of excessive size will not comply with Standards as the
flange may not overlap the hole sufficiently.
• Remove the loose flange from the unit. Insert the damper through the hole and fit the flange over
the spigot protruding from the other side. Mark the flange location and rivet holes on the damper
body.
• To prevent damage to the wall board, remove the damper from the wall to drill rivet holes.
• It is much easier and cleaner to check the holes are correct by refitting the damper to the wall at
this stage before the fire mastic sealant is applied.
• You are now ready to apply fire mastic sealant and fix the damper to the wall.
Plasterboard Installation Instructions I
All Rights Reserved, NZ Patent No. 328088 , Australian Patent No. 730742
BSD-PW Fire Damper
Plasterboard Wall
Installation Instructions
Square Flange BSD-PW
Size Size
225 250
250 300
275 400
300
November 2017 © Malcolm Ravenscroft Ltd
Hole Square
Diameter Flange Size
290 350
340 410
440 650
www.ravenscroft.co.nz