A field serviceable assembly for displaying images comprising: a frame; an intake for ingesting ambient air; an exhaust for exhausting ambient air; a first and second side assembly, each having a rear surface and mounted to the frame in a back to back arrangement, wherein the first and second side assembly are each mounted to the frame in a hinged fashion for movement between an opened and a closed position, and wherein at least one of the first and second side assemblies comprises: a cover panel (17, 217); an electronic display (11, 211) located behind the cover panel; a backlight (21, 221) located behind the electronic display; a first channel (25, 225) configured to receive circulating gas; and a second channel fluidly connected to the intake and the exhaust and configured to receive the ambient air; and a cavity located in a space between the rear surfaces of the first and second side assemblies and the frame; an electronics plate (42, 142) positioned within the cavity and configured to receive a plurality of electronic components (30, 44), wherein said electronics plate is configured to remain stationary when said first and second side assemblies are moved between said opened position and said closed position, wherein movement of said first or second side assemblies into said opened position exposes said electronics plate to facilitate access to said electronic components located thereon; a closed loop pathway for the circulating gas comprising said cavity and said first channel of each of said first and second side assemblies; and an open loop pathway for the ambient air comprising said intake, said exhaust and said second channel of each of said first and second side assemblies; characterised in that said closed loop pathway, including said cavity, is isolated from the open loop pathway and the ambient air while the first and second side assemblies are in the closed position. a frame; an intake for ingesting ambient air; an exhaust for exhausting ambient air; a first and second side assembly, each having a rear surface and mounted to the frame in a back to back arrangement, wherein the first and second side assembly are each mounted to the frame in a hinged fashion for movement between an opened and a closed position, and wherein at least one of the first and second side assemblies comprises: a cover panel (17, 217); an electronic display (11, 211) located behind the cover panel; a backlight (21, 221) located behind the electronic display; a first channel (25, 225) configured to receive circulating gas; and a second channel fluidly connected to the intake and the exhaust and configured to receive the ambient air; and a cover panel (17, 217); an electronic display (11, 211) located behind the cover panel; a backlight (21, 221) located behind the electronic display; a first channel (25, 225) configured to receive circulating gas; and a second channel fluidly connected to the intake and the exhaust and configured to receive the ambient air; and a cavity located in a space between the rear surfaces of the first and second side assemblies and the frame; an electronics plate (42, 142) positioned within the cavity and configured to receive a plurality of electronic components (30, 44), wherein said electronics plate is configured to remain stationary when said first and second side assemblies are moved between said opened position and said closed position, wherein movement of said first or second side assemblies into said opened position exposes said electronics plate to facilitate access to said electronic components located thereon; a closed loop pathway for the circulating gas comprising said cavity and said first channel of each of said first and second side assemblies; and an open loop pathway for the ambient air comprising said intake, said exhaust and said second channel of each of said first and second side assemblies; characterised in that said closed loop pathway, including said cavity, is isolated from the open loop pathway and the ambient air while the first and second side assemblies are in the closed position.