Dimension of outer the frame is 80mm(L) x 80mm(W) x 25mm(H) / The size of fan in inch is 3.15in(L) x 3.15in(W) x 1in(H); The center to center distance beween the mountiong holes is 71.5mm/2.81in.

QUIET: RVLOVENT 12 volt RV roof vent can intake or exhaust fresh air immediately and stay cool without distracting noise. 3-SPEED FAN REVERSIBLE : The fan can be operated in Reverse/Forward mode.