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Laboratory Exhaust
Vari-Plume® and Laboratory Exhaust Products
SUPPLEMENTAL INSTALLATION AND MAINTENANCE MANUAL
This publication contains supplemental installation and maintenance instructions for Vari-Plume® and Laboratory Exhaust units:
• CPSLE |
• QMXLE |
• TCNHBLE |
• CAVP |
• QMXVP |
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Carefully read this publication prior to any installation or maintenance procedure. Refer to the appropriate Installation, Operation, and Maintenance Manual for items not specifically covered here, such as handling, storage, start-up, etc.
Loren Cook brochure, Vari-Plume® Laboratory Exhaust, provides additional information describing the equipment, fan performance, available accessories, and specification data.
For additional safety information, refer to AMCA Publication 410-96, Safety Practices for Users and Installers of Industrial and Commercial Fans.
WARNING
This unit has rotating parts. Safety precautions should be exercised at all times during installation, operation, and maintenance.
ALWAYS disconnect power prior to working on fan.
Handling and Lifting
Always lift fan by lifting lugs. Never lift unit by shaft, motor, housing, or nozzle.
The units may be shipped in sections and each section should be lifted into place using the provided lifting lugs. If the unit is to be lifted assembled, lift the unit with lifting lugs attached to the fan housing using a spreader bar as required to ensure no damage is incurred on the nozzle assembly.
All Vari-Plume® and Laboratory Exhaust units are designed to be self-supporting, without the use of guy wire, when installed according to the instructions within this document. The roof curb must be securely installed prior to fan installation according to the curb manufacturer’s recommendations.
Unit Assembly
If unit is shipped in sections, assemble unit starting at the lowest level moving up the assembly. Each section should have a pre-installed gasket that must be present to ensure proper sealing of unit. If the gasket is damaged or missing, caulk may be used to seal the sections by applying between the bolted sections. Once the gasket/caulk has been verified, assemble the sections and bolt together with the provided hardware.
Installation
The unit should be installed on a curb/base that is securely attached to the roof structure per contract documents and local codes. If the curb is provided by Loren Cook, the curb should be attached per the provided submittal document by welding to the roof structure.
For curb mounted assemblies, the unit should be securely fastened to the curb using minimum ¼” x ¾” sheet metal screws using pre-punched holes in the curb cap. If pre-punched holes are not provided, use a minimum of 2 screws per side and a maximum of 12” spacing.
Drain Connections
Loren Cook lab exhaust fans all have drains as standard construction features. These drains should be properly connected to a drainage system to ensure that the run off from the units is disposed of properly. The connection should include a trap system (Figure 5) that is sized adequately to not allow for air leakage under the system pressure. Dimension A and B should be double the total static pressure for the unit.
FIGURE 5
Finger-Tight Plug
Clean Out 
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B |
Finger-Tight Plug |
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Drain Pipe |
Clean Out |
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(6" Min) |
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Slope To |
A |
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(6" Min) |
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Drain Trap |
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Drain |
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CPSLE
QMXLE
CAVP
TCNHBLE
QMXVP
Typical Installations
QMXVP QMXLE, TCNHBLE
Typical installations for QMXVP, QMXLE, and TCNHBLE are shown below utilizing the Loren Cook LE curb. Figure 1 shows a unit without mixing box and an optional curb mounted isolation damper. The curb should be secured to the roof structure per project documents and then the isolation damper mounted in the curb as required. Ensure that the curb gasket is present and not damaged once the curb has been properly installed on the roof. Then the unit should be installed on the curb using the supplied mounting brackets and recommended fasteners.
CURB CAP
PVC GASKET
3/8-16 STAINLESS STEEL BOLT
ISOLATION DAMPER
LE CURB
A x 3/4”
SELF TAPPING SHEET METAL SCREWS
(BY OTHERS)
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C |
SIZE |
A |
DUCT WORK |
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60-330 |
1/4 |
SELF TAPPING SHEET |
365+ |
3/8 |
METAL SCREWS |
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(BY OTHERS) |
FIGURE 1 |
DETAIL C |
Figure 2 shows a typical installation using a mixing box/ plenum and the Loren Cook LE curb. Similar to above the curb should be installed first per project documents and then the unit installed on the curb using recommended fasteners.
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DETAIL B |
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ANGLE |
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FRAME |
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A x 3/4” |
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SELF-TAPPING |
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SHEET METALS SCREWS |
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CURB CAP |
(BY OTHERS) |
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PVC |
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GASKET |
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3/8-16 STAINLESS |
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STEEL BOLT |
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MIXING BOX |
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PVC |
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GASKET |
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WIZZ BOLT |
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B |
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CURB |
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DUCT WORK |
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Figure 2 |
SIZE |
A |
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60-330 |
1/4 |
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365+ |
3/8 |
CPSLE
Figure 3 shows a typical CPSLE installation on a Cook RCG curb. The RCG curb should be securely mounted to the roof per project documents. Ensure that the curb gasket is in place once the curb has been installed on the roof. The unit should then be installed on the curb using the fasteners recommended in figure 3, Use a minimum of 2 screws per side and a maximum of 12” spacing.
NOZZLE
CPSLE UNIT
CURB CAP
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1/4" SELF-TAPPING |
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LOREN COOK |
SHEET METAL |
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SCREWS |
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RCGH CURB |
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(BY OTHERS) |
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FIGURE 3
CAVP
A typical installation for a CAVP with mixing box is shown in figure 4. The CAVP unit is installed on either isolation rails or base as defined in the project documents. This unit is then installed on the roof using the correct vibration isolators per the isolator installation instructions. The mixing box is installed on a roof curb using the fasteners recommended in figure 4 and the roof curb should be mounted securely to the roof per the project documents. The final connection between the fan and mixing box is made using the supplied flex duct connector.
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8" to 16" |
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CAVP |
FLEX DUCT CONNECTOR |
MIXING BOX |
ASSEMBLY |
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ISOLATION |
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RAIL |
PVC GASKET |
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ISOLATORS |
RCGH CURB |
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1/4" SELF TAPPING |
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FIGURE 4 |
SHEETMETAL SCREWS |
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(BY OTHERS) |
2
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