them under the track to help distribute the air flow along their length it will be understood that the number location and orientation slots 92 of cooling ducts 88 and 90 can be varied and altered to facilitate alternate track and conveyor chain configurations referring again to fig3 an air knife system 70 is also preferably included upstream from cooling system 80 since the lubricants delivered to the hot chain 34 by automatic lubricating system 64 tend to leave deposits on conveyor chain 34 and some of these deposits can fall or be dislodged from chain 34 the flow of cooling air from cooling system 80 could potentially result in the unwanted distribution of dirt particles throughout the ambient air in the vicinity of the area on which baking products are onloaded and offloaded to conveyor 14 thus it is desirable to remove as much of such deposits from conveyor chain 34 as possible in the present embodiment these deposits are removed by air knife system 70 air knives are generally well known in industry the air knife envisioned for use to remove deposits from the conveyor chain 34 includes a high pressure air supply 72 which directs high pressure air to one or more air knife nozzles 74 in such a manner as to direct a high velocity high pressure stream of air across conveyor chain 34 to dislodge the maximum amount of lubricant and dirt deposits therefrom air knife system 70 is preferably positioned upstream from cooling system 80 so that deposits can be stripped and collected from conveyor chain 34 before it is subjected to cooling air flow and thereby minimizing the amount of dirt particles which are carried into the ambient air.