Abstract: An electronic lock housing for the inside surface of a door with an opening therethrough has an interior portion for receiving electronic components for a door lock, a back portion with channels, a bracket, a plug, and a front portion. The back portion is meant for securing onto the door surface and has an opening meant for alignment with the door opening. The channels in the back portion permit air from the outside of the door to flow through the door opening and housing back opening to the inside of the door without passing through the housing interior. The bracket secures the back portion to the door and receives the plug to create an air-tight seal within the housing interior. The housing front portion is secured over the assembled back portion, bracket, and plug once they are installed to the door surface, fully encasing the electronic components.

Abstract: A lock cylinder monitoring assembly for monitoring position of a lock cylinder. The monitoring assembly includes a housing having an inner cavity and an exterior diameter. The exterior diameter of the housing is not significantly greater than the corresponding cylinder diameter. The assembly further includes a switch received into the inner cavity of the housing. The switch is in electrical communication with an indicator. The switch is reactive to any change in position of the lock cylinder.

Abstract: A cylinder lock monitoring assembly for monitoring position of a lock cylinder. The monitoring assembly includes a housing having an inner cavity and an exterior diameter. The exterior diameter of the housing is not significantly greater than the corresponding cylinder diameter. The assembly further includes a switch received into the inner cavity of the housing. The switch is in electrical communication with an indicator. The switch is reactive to any change in position of the lock cylinder.