High Capacity Grease Gutter Our Grease Gutter High Capacity is the perfect solution for high discharge fans where four sided protection is needed. The High capacity Grease Gutter will accommodate the higher volume of grease produced by char broiling and heavily used fryers. It has a compact design with a eight inch trough and is made from the same durable polymers as the original. The High Capacity Grease Gutter uses a simple combination of efficient grease absorbing pads to suit high discharge applications without failure. The additional capacity will also decrease the frequency of the filter changes..