COOK Laboratory Exhaust - Manual (Page 2)

1.0 Pre-Lift Considerations
Curbs may be structural steel, formed concrete or formed metal. A Loren Cook supplied formed
metal curb will be shipped, unassembled, to the job-site prior to the shipping of the unit.
Scheduling of the curb will be the responsibility of the contractor. Each part of the curb is
identified with the proper tags and / or markings. Complete assembly instructions are shipped
with and attached to each curb package. Where more than one curb is shipped to one location,
there will be assembly instructions with and attached to each curb package. It is important the
curb be installed level and square and that it is checked for proper length and width. Each curb
is marked with matching serial numbers for each unit. The structural steel, concrete pad or
formed curb to be used should be level and of an even plane. Uneven surfaces at the point of
mating sections will cause considerable alignment problems. It would be beneficial to shoot the
grade with a transit prior to the lift. This will determine the high or low points of the installation
and thus the points to be shimmed as well as the amount of shimming material needed.
The curb installation shows a curb gasket that is mounted between the curb and the unit. When
Loren Cook supplies this gasket, it is not shipped with the curb, but shipped with the completed
unit and is so noted on the unit packing list. It is necessary to check the unit packing list for
location of the section of the unit in which the curb gasket is located. It is necessary to install
the curb gasket before setting the unit on the curb. This is necessary for an air seal between
the unit and the curb and also serves as dampening. However, this should not be used as a
vibration isolator where the prevention of noise and vibration transmission into the building is
critical.
Note: See section under receiving instructions when receiving curbs, inspecting for freight
damage and filing of freight damage claims. Any freight damage is the responsibility of the
receiving contractor and/ or his authorized receiving agent and the delivering carrier.