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10
9
Fan installation
The process of ventilation stack installation is shown in Fig. 9-10.
Air flow direction should match the direction of an arrowhead placed on the fan case.
To ensure quiet operation of ENERGY STAR qualified inline fans, each fan shall be installed using sound attenuation techniques
appropriate for the installation. Insulated flexible type duct work (recommended for all bathroom exhaust applications) will result in
quieter operation. We recommend minimum 8" of insulated flexible duct between any exhaust grill and fan for low noise level. Flexible
duct should be connected to the fan with hose clamps (VENTS C series is recommended), aluminum foil tape or both. All connections
should be as airtight as possible to maximize system performance and eliminate air leakage. When using flexible type duct work, duct
should be as tight and straight as possible. In case you intend to use non-flexible ducts we recommend to install flexible connectors
(VENTS VVG series is highly recommended) which are designed to exclude the vibration transmission from fans to an air duct. Remove
any insulation from the area where you will be mounting the fan. Insulation should never be installed over any part of an exhaust fan.
Keep the insulation at least 3" away from the fan case.
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