A door is an entrance to a room or edifice. It is hinged along one side, and usually has a ringed handle or a keyhole on the other. It is left to the artist whether the hinged side is on the dexter or sinister side of the door.
The door may be drawn without a frame, as in the arms of Portinari, c.1475 [Huntington Library art collection]; however, in period emblazons, the door is more frequently found inset into an arch or wall. The canting arms of Portenau or Portnaw, c.1460 [GATD 18], with open double-doors hinged on an arch, was a common heraldic motif for doors.
Galen Litelpage of Redore bears: Argent masoned sable, an arched door gules, banded and handled azure.
Kenneth Underhwealf bears: Or, a wooden door proper, hinged, latched and padlocked, in base a key fesswise, wards to sinister sable.
Aleksandr Vasilyevich Lev bears: Azure, a lion rampant guardant maintaining a patriarchal crozier, within a stooped arch, doors open, all Or.