Heng's 22" X 22" White Exit Vent Lid for Hengs/ Elixir 90129-C1 22-0171

Replacement lid is made of plastic. When in normal use, these large exit vents draw out and emit three times the air flow of a conventional size dome vent. A unique added feature is that they are designed to allow a person to escape through the vent by engaging the emergency lever that opens the screen.