If noise is of no concern to you while working in the darkroom I suggest that you purchase the cheap bathroom fans that were previously mentioned. Frankly they would drive me "batty." I discovered Panasonic ventilation fans at our local lighting goods supplier. I was particularly impressed with the quietness and the volume of air that it moves. The fan comes complete with in intake assembly to assure a smooth and effective in/out transfer of air. I placed my fan about four feet above my sink. The cost was around $130.(posted 8828 days ago)