Abstract: A slot diffuser deflector and air deflector assembly to redirect the air flow emitted from a slot type air diffuser are disclosed. In one embodiment, the air deflector device includes an arc deflector configured for placement suspended from a slot air diffuser having a slot opening for emission of air from a central heating and cooling system, wherein the emitted air is dispersed and directed by the arc deflector. The air deflector device includes an attachment means configured to attach the arc deflector to the slot opening of the slot air diffuser.