The Low Volume Grease Containment System is designed for exhaust fans that don't create a significant amount of grease. It's a cost-effective solution to take care of those low volume areas. The LV Box System has the custom manufactured grease pillow inside the box. After installation, only the grease pillow needs to be replaced depending on the amount of grease discharged by the fan. The grease pillows are inexpensive, which makes this an attractive option for cooking operations with lower grease volume. Each Low Volume Box comes with custom DRIPLOC Filters inside. We recommend the filters be changed after each exhaust fan cleaning, however, grease exhaust volume will dictate the changing frequency. WARNING : This product can expose you to chemicals including Cobalt Metal Powder and 1,3,5-Triglycidyl-s-triazinetrione, which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov .