Heng's (V971202-C1G1 White (14" x 14") 12V EZ Vent Heng's Industries Clamp-Style Painted Metal Base Vent with Fan Features: Self-centering device eliminates installation guesswork and assures perfect alignment in roof opening Exclusive four-screw inside flange mount feature for attaching base garnish to lid mount Saves labor on installation Vent with 12-volt fan, Pure White base screen frame; White