Room Ventilation System, Apparatus, and Method

A room ventilation system for enabling a user to selectively ventilate a room, the room ventilation system comprising, in combination:

• a wall-based, assembly-holding construction, the wall-based, assembly-holding construction dividing a room interior from a room exterior, the assembly-holding construction comprising an upper tube-engaging assembly and a lower tube-engaging assembly, the upper tube-engaging assembly comprising lower concave surfacing, the lower tube-engaging assembly comprising upper concave surfacing opposing the lower concave surfacing;
• a tubular vent assembly, the tubular vent assembly having an apertured outer tube construction, an apertured inner tube construction, the outer tube construction having upper convex surfacing, lower convex surfacing, room-exterior-side fixed apertures and room-interior-side fixed apertures, the upper convex surfacing being fixedly attached to the lower concave surfacing, the lower convex surfacing being fixedly attached to the upper concave surfacing, the inner tube construction room-exterior-side rotatable apertures and room-interior-side rotatable apertures, the inner tube construction being rotatable relative to the outer tube construction for aligning the rotatable apertures with the fixed apertures for selectively enabling an air current to pass intermediate the room interior and the room exterior for ventilating the room interior.