Camco 45192 Sunshield 14" x 2-3/4" Reflective Foam Vent Insulator Sunshield RV Vent Insulator with a full 2.75? of foam. Fits snugly in vent opening to help stop heat transfer, keeping your RV cooler in summer and warmer in winter. Reflective surface blocks 100% of the suns damaging rays. Fits standard 14 vents.