Cooling of a product may be accomplished using a rotating drum cooler or a fluidity bed cooler. Either way cool air is brought into intimate contact with a hot – and usually granular – product which is tumbled through the cool air stream in the case of a drum or air fluidity in the case of the fluidity bed. Heat is taken out of the hot product and into the air stream which must be extracted and filtered since it will has gained a loading of particulate matter during the process . Even if the hot product has significant moisture content the action of heating the air stream results in driving down the relative humidity of the air so wetting of the filter media is not to be expected. The flows are usually large so FabriPulse Fusion will be an expected choice, although if the waste particulates are to be taken into solution (e.g. sugar fines) then RotoClone W or RotoClone N make good choices.