AMS Fireplace offers Vent covers complete the construction of your gas fire pit project. Ventilation is a necessity for all gas fire pits; for propane applications, fresh oxygen is required to draw into the air mixer in order to burn properly, while natural gas units can overheat without any ventilation. We recommend you install two of these vent covers on opposing sides to give your gas fire pit the ventilation it requires - and also keep small animals from getting into your fire pit.