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The Maxxfan combines a standard 14 x 14 in roof vent opening with a high-powered, 4-speed exhaust-only fan and a built-in rain-shedding lid, so you get ventilation and weather protection from one unit. A manual knob at the ceiling opens and closes the lid.
A solid, no-frills replacement or upgrade for RVs still running fixed roof vents, or for swapping out a worn factory fan.