Air Diverter- Ceiling Air Vent Deflector, White 24″x12″ for traditional style ceiling air diffusers. Divert cold or hot air from HVAC air conditioning units from blowing down directly. Easily installed underneath a standard 2’x2′ HVAC diffuser. 23-3/4″ wide x 11-3/4″ long x 2-1/2″ high. .080 gauge polystyrene construction. NOTE: Air Diverters are intended to be used one at a time. Do not block the entire diffuser by using two side by side.