there are multiple baffle assemblies 10 in the hood assembly 40 then there would be a drainage trough 62 associated with each baffle assembly 10 however it is also contemplated that the drainage trough 62 may extend the width of the several or all of the baffle assemblies 10 by making the drainage trough removable it can be easily cleaned by the user referring to fig8 as discussed above the channels in the upper and lower baffle sections are designed to direct and capture grease that is entrapped within the air stream as it is being exhausted during use when the motor assembly 44 is activated a negative pressure vacuum is created along the top of the upper baffle section 14 this causes air from the cooktop to be drawn first through the spacing 22 between the lower baffle channels 18 and into the open side 28 of the upper baffle channels 26 the grease laden air hits the base 26 a of the upper baffle channel 26 and is then directed to the lower baffle channel 18 contacting its base 18 a due to surface tension and the physical properties of the grease the grease is retained on bases 26 a and 18 a as the air continues to flow as shown in the figure by the solid arrow as the grease builds up on channel 26 gravity and the pressure caused by the flowing air will cause the grease to slide along the side walls 26 b of the upper baffle channel this is shown by the stippling in fig8 the grease will eventually drain down onto the base 18 a of the lower baffle channel 18 where it will collect as discussed above the baffle assembly 10 is mounted.