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Objective The purpose of this report is to inform you of a malfunction in the ventilation system and to propose a solution to this problem. Summary After receiving numerous complaints of illness from many of the employees in the Painting Department, I have inspected the ventilation system and found it inadequate. The fresh air volume entering the room is well under the requirement for safe working conditions. I have found that the problem does not lie with the fan itself, but in the drive system design. I have decided that the most economical solution is to redesign the drive system of the main ventilation fan. In this report I will address both the problem and the solution in detail. Problem The ventilation system that is currently in use is not providing proper fresh air vol- ume to the painting area. The result of this problem has been numerous complaints of headaches and nausea among the employees who work in this department. After conducting extensive research, I have found that the volume of fresh air entering the area is well under the OSHA standard for safe working conditions. This lack of ventilation is not caused directly by the fan but the system that drives it. Upon my inspection of the drive system of the fan, I found two problems: se- vere misalignment between the motor and fan sheaves and an improper drive speed ratio. The severe misalignment is causing extensive wear and decreased performance. The misalignment causes the belt to fit improperly into the sheave groove. The improper drive speed ratio is caused by a miscalculation in the de- sign of the drive system. The ratio is a numeric value that compares the speed of the faster shaft to the speed of the slower shaft. This ratio is controlled through the use of sheaves with different diameters for the motor and the fan. Solution I propose the redesign of the drive system for the main ventilation fan. This process would include realigning the motor with respect to the fan and correcting the drive speed ratio. The realignment of the motor can be achieved by adding an adjustable base to the foot of the motor. The adjustment is made through the use of elongated holes in the base. Positioning the sheaves parallel to each other allows proper contact between the belt and the sheave thus there is better trans- mission of power to the fan and belt life is increased. Correction of the speed ratio is casily achieved through the substitution of the current sheaves with those of the proper diameters. Many combinations of diameters are available that will fulfill the requirements for increasing the speed of the fan. This is a relatively economical solution to a very serious problem.