As mentioned in a previous article, HVLS fans work best over open areas where air can move freely ceiling to floor, then outward in all directions. For this reason, fans should not be placed near walls or other obstructions, since these may limit airflow and effective coverage area. Ideally, each fan should be between 20 and 25 feet above the floor, using extensions (known as downrods) where necessary to achieve optimum height. Facilities with very tall ceilings will need multiple fans spaced closer together to provide ample air movement at the working level, as ideal fan height may not be possible.
Other factors to consider when placing HVLS fans:
- Avoid mounting the fan underneath any area lighting. This will prevent the “strobing effect” when the fan is in operation.
- Blade clearances are critical! Hanging a fan too close to potential obstructions (chain suspended lighting for example) can create a safety hazard. A good rule of thumb: blade clearances should equal 15% of the fan’s diameter in all directions. Example: a 24 foot fan should not have any potential obstruction closer than 3.6 feet.
- Pay particular attention to the routing of the fan’s control cable (between the fan and the control keypad near the floor). If possible, run this cable in conduit, or in such a way as to avoid lighting fixtures. Doing so will reduce the possibility of signal noise and fan operational issues.
Still have questions? As always, the air movement experts at Patterson are a phone call away! Put their HVLS experience to work in your facility!