a passenger side air bag deployment opening is formed by interfit unequal triangular door substrate panels , four triangular door substrate panels in a first embodiment fit into an asymmetric quadrangular deployment opening in the instrument panel and able to be hinged open by the inflating air bag . three triangular door substrate panels in a second embodiment forming a triangular deployment opening the door patterns of each embodiment allow the door substrate panels to avoid damage to the windshield and injury to a passenger when forced open .