Great solution when you need complete 360 low volume leak protection. System provides 4" wide protection around the fan curb and utilizes the DRIPLOC SUPERWASH FILTER technology. System installs in minutes and fits fan curb sizes ranging from 18" to 32" Flex frame design easily adapts to fit a wide variety of curb sizes Top -Pre filter dispersement layer made of fire retardant material (FMVSS 302) holds grease and serves as a UV protectant Four heavy-duty oil absorbing layers made from fire retardant (FMVSS 302) material that absorbs oil only and refuses water 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 .