7
Laboratory Exhaust Systems
®
Prior to lifting any components, verify the weights on
the project submittal drawings for each component
or contact factory. Do not lift weights beyond the
capacities of the on-site lifting equipment. Proper
handling of the equipment is critical to avoid damage to
the unit.
Prior to setting the bypass air plenum (BAP), secure
1/4-inch thick by 3/4-inch wide EPDM gasket (provided)
around the perimeter of the roof curb top edge, if
mounting on a roof curb.
Bypass Air Plenum - Rigging and Lifting
Each section
will have four (4)
lifting points. All
lifting points must
be used when
lifting. Spreader
bars of sufficient
length need to
be used to prevent damage to BAP
walls and components mounted to
the BAP.
1.
Always use all lifting points provided by
manufacturer. Failure to do so may result in
dropping the BAP and voiding the warranty.
Lifting points are located around the perimeter of
each section.
2. A spreader bar
must be used
when lifting
each section to
distribute the
weight evenly
and to prevent
the unit from
being over-
torqued. Avoid
unnecessary
jarring or rough
handling.
3. Care must be
taken to keep
the unit in the
upright position
during rigging.
4. Care must be taken to not damage the watertight
seams in the unit casing.
5. Avoid damage to the curb and curb gasketing when
rigging onto a curb.
6. Only use trained professional riggers when moving
equipment.
Bypass Air Plenum Installation
Bypass air plenums (BAP) are delivered fully assembled
unless shipping restrictions require multiple sections.
If delivered in sections, all materials required to join
plenum sections together are provided.
Bypass air plenums are modular in construction and can
be disassembled to provide allowances for lower on-site
lifting capacities. Plenum sections are joined using
stainless steel fasteners. These are removed to separate
sections for lifting purposes. Save hardware as these
will be required to join the BAP sections together again.
If moving separate sections onto a roof curb or support
structure, each section should be joined to its mating
section after moving into position and before lifting any
additional section(s) into position.
Steps for joining multiple BAP sections together:
1. Lift and place first BAP section making sure that
mounting holes are positioned with curb mounting
holes or to structure BAP will be secured.
2. Attached provided gasket to plenum section using
the pattern shown in the image.
3. Ensure bolts are removed from both mating
sections to being joined together. Plenum will ship
with hardware in one section’s bolt holes or were
removed to disassemble BAP to reduce lifting load.
4. Lift and place next section into position using
similar lifting procedure.
5. Align holes between two mating sections.
6. Use fasteners (provided) to join the two sections
together, this will involve utilizing the nutserts in
each section on the inside perimeter. The fasteners
are tightened until the sections are pulled together
and the gasket material is compressed.
7. Caulk joint (provided) on the top and two sides
between sections for enhanced water protection.
8. Repeat steps 1 – 7 until all plenum sections are lifted
and joined together.
Any side panels removed to gain access to the interior
of the plenum should be reattached.
Gasket Material
each plenum section
Bolt Holes
Plenum Section
Lifting Points
Lifting Points
NOTE
Components that are shipped separately should be
lifted separately due to weight and dimensions.
Spreader Bar
Chains
Two fan bypass air plenum shown.
Plenums may be single sections
or up to six in length
Bypass Air Plenum - Rigging, Lifting and Installation
