 What is ventilation, and how can a F.I.T. Ventilation™ System significantly help in moving heat and fumes out of the work space?
Essentially there are three methods of standard ventilation: Negative Pressure, Balanced Air System (or Push/Pull System) and Positive Pressure
With a Negative Pressure system, exhaust fans are used to try and suck heat and fumes out of the building. Negative pressure neutralizes in all directions -- top, bottom, left or right. So, if the emissions or heat are in the middle of a plant, negative pressure is very inefficent. The challenge with a stand-alone exhaust system is that most do not have the power to gather a large portion of air, and will only remove the heat and fumes directly in front of the exhaust fan. A simple illustration of Negative Pressure: try extinguishing a candle by inhaling rather than exhaling.
With a Balanced Air, or Push/Pull, System there are fans at one end of a building pushing air toward an exhaust system either on the ceiling or opposite wall. The challenges with a traditional Balanced Air System is that it requires expensive duct work, and there will quite often be "dead spots" as air flow can only travel limited distances depending on fan size or duct locations.
In a Positive Pressure System, shrouded fans are used and air is introduced into the space, increasing air pressure equally at all points inside the structure. When an exhaust opening is created, all of the interior air moves in one mass to the exhaust point. The key is to seal the opening with incoming air so the air within the building can only escape through the exhaust point. You must have more air coming in than going out. |
