Wooden Fills Cooling Towers

Fill, or wet deck or surface, is a medium used in cooling towers to increase the surface area of the tower. Increased surface area allows for maximum contact between the air and the water, which allows for greater evaporation rates. There are two basic types of fill: splash fill and film fill.In the past, redwood was selected for use in cooling towers because of its high strength-to-weight ratio, availability, ease of use, low cost, and natural resistance to decay. Pressure-treated Douglas fir and similar types of wood are replacing redwood due to cost and availability factors.