Abstract: An air vent covering assembly is provided which is adapted to be mounted to a floor, in the peripheral region of an air vent opening therethrough. The air vent covering assembly comprises a cover plate, abase, at least one damper plate, and first and second brackets. The cover plate and base have a plurality of spaced-apart and substantially parallel louvers formed therein, and each of the plurality of louvers defines an edge of a space. Each of the at least one damper plate includes a plurality of spaced-apart and substantially parallel damper bars, and the number of damper bars is equal to the number of louvers provided. When the damper plate is in an open position, flow of air through the spaces defined by the plurality of louvers is allowed, and when the damper plate is in a closed position, flow of air through the spaces is precluded.