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Threads into included deck plate, and is removable from outside without tools. The whisper quiet Nicro Day/Night Solar Vent moves over 1000 cubic feet of air in an hour or 24,000 cubic feet of air a day (4" model). On/off fan switch, LED lights and intake/exhaust switch accessible from inside the cabin for ease of use. Rechargeable battery allows for 24-hour continuous operationNo wiring requiredHigh capacity NiMh battery operates vent for up to 24 hours without sunlightCirculates fresh air in boat cabin eliminating mold, mildew and musty airBuilt-in on/off fan switch, LED lights and intake/exhaust switchThreads into included deck plate and can be removed from outside without toolsComplete air and green water shut-off from belowIncludes white plastic interior trim ring, insect screen, mounting hardware and installation manualReplaces Nicro 4" snap-in deck plates (fits existing holes once snap-in deck plates are removed) and Day/Night Plus models