Keeps fats and oils off of rooftops and out of drains reducing fire hazards and fines from FOG contamination in water runoff and in waterways. Two-tiered system made from galvanized metal to stand up to extreme weather conditions. Fats and oils are stopped and absorbed by the first-tier box with a grease pillow that mounts inside and above a larger bottom section with a larger grease pillow for extra absorbency and protection. Weep holes allow water to run freely while specially designed grease pillows trap grease and oil. The pillows are made with a weather resistant mesh fiber filled with a granular mineral absorbent that is hydrophobic and allows the grease to penetrate deep within the pillow for maximum absorbency. Protects roofs from harmful fats, oil and grease. Mitigates rooftop grease fire potential. Grease absorbent is ECOLOGO Certified and certified non-leaching. Like it or not, grease happens. Right over your head, right now: Fats, Oil and Grease (FOG) may be destroying your roof and creating a real fire hazard. And after it’s done there, FOG will typically make its way into your drains, creating even more problems for you. With more cities and states passing legislation aimed at protecting storm drains, you may be liable for expensive fines. With the revolutionary Grease Catcher Grease Containment System, you can protect your kitchen roof from damage or fire by automatically catching and absorbing grease and oils that drip from your kitchen exhaust fan. Includes: Installation instructions 16" x 16" Tray 4.5" x 16" Box 16" Tray Pillow Cross Bar Three sheet metal screws XPFG616S Box Pillow XPFG1616S Tray Pillow