What size fan should I use if I want to use the BIG BLUE in an exhaust system for odor control?
Sizing a fan for the BIG BLUE isn’t like sizing for a carbon filter. Fan size and the CFM rating are not the variables you need to account for. Contact time is the important variable. If you have a 5 CFM fan blowing through a BIG BLUE then you’ll have more contact time for the UV light to kill malodors vs having a 500 CFM fan blow through the same unit. This is more related to the number of air exchanges in a given period you desire for proper plant transpiration. It is not a question of what is best for odor elimination. It is best to use the lowest cfm fan available to accomplish this exchange. Watch this video. BIG BLUE ozonators come in varying diameters from 4 to 12 inches. The larger diameters are not only designed to fit your existing ventilation ducting but also ever higher fan volumes. In other words the 12 inch BIG BLUE will handle more cfm than the 4 inch.