HENG'S 14" RV CAMPER TRAILER UNIVERSAL SMOKE LID ROOF VENT WITH 12V 12 VOLT FAN 74112- NO GARNISH RING INCLUDED RV Roof Vent w/ Smoke Lid and 12 Volt Fan Heng's Part # 74112-C NO Inside Garnish Shroud (Trim Ring) Mounting Hardware Included 70" Putty tape - 28 Pan Head Screws #8 x 1" ROUGH CUT-OUT OPENING DIMENSIONS (this is the hole you will need in your roof) 14  X 14 EXTERIOR MOUNTING FLANGE DIMENSIONS (sits on the top of your unit) 16  X 16