Abstract: A roof ventilation system for efficiently allowing air to flow through the peak of a grain bin year round. The roof ventilation system generally includes a frame extending from the upper opening, wherein the frame defines a passageway extending through an interior of the frame adapted to communicate air flow between an interior of the grain bin and ambient air. A shell at least partially surrounding the frame to at least partially seal the interior of the frame. A screen is interconnected between the frame and the shell, wherein the screen includes a plurality of outlets extending therethrough in communication with the passageway. A heating element is in communication with the screen, wherein the heating element dissipates heat to the screen to prevent ice buildup upon the screen.