Heng's 14"  Smoke Lid Roof Vent With 12V Fan       

Rough Cut-out Opening Dimensions                                                                        (this is the hole you will need in your unit):14 1/2" X 14 1/2"

Exterior Mounting Flange Dimensions                                                                      (this is on the top of your unit): 16 1/2" X 16 1/2"

Garnish/Interior Trim Ring Include