can be swung down fully 90 degrees as shown in dotted lines in fig4 for removal of filters if desired but the doors can be swung down only 20 degrees from vertical and locked there for cleaning without removal of filters the bottom trough of the ventilator is pitched from one end to the opposite end to provide for drainage directly into the building floor drain to clean the ventilator a water spray nozzle is manually injected into the ventilation slot 34 from the slot the spray nozzle cleans the front inside of the chamber and the front surface of the baffle 44 then the filter access doors can be locked open at a 20 u00b0 angle and the spray nozzle inserted to clean the top side of the grease filters the access door is then opened fully the grease filters turned upside down the access door closed to 20 u00b0 open position and the second side of the filters cleaned water evenly dispersed through the filters will clean the back side of the back of the chamber and the back of the baffle is cleaned the baffle 44 can be lowered and moved forward to the position shown in fig6 so that the lower back wall 21 and the rear of baffle 44 can be cleaned by inserting the spray nozzle through the ventilation slot 34 to this point the operator has spent less time than would be required to clean the filters and the grease collection cups in a conventional system and has actually done everything except the duct and fan that would be done in a one two four times per year.