A methods for mounting, opening, closing and releasing a door assembly relative to a mounting structure employ a first structure that defines at least one elongated guide channel and a latching subassembly that is adapted to be mounted with respect to the foregoing guide channel and to rotate with respect thereto. The installation comprises a chassis including a metallic heat input region. The controllable switch is responsive to the on-off command signal to selectively operate in a CLOSED mode and an OPEN mode. The hammer mechanisms include sidewisely reversible hammer legs having portions received by the rotors sidewisely contiguously.