New design threads into included deck plate, and is removable from outside without tools. On/off fan switch, LED lights and intake/exhaust switch accessible from inside the cabin for ease of use.

Circulates fresh air in boat cabin eliminating mold, mildew and musty air Moves 1,000 cubic feet of air/hour or 24,000 cubic feet of air/day (4" model)
Rechargeable battery allows for 24-hour continuous operation
Whisper quiet fan operation
No wiring required
Built-in on/off fan switch, LED lights and intake/exhaust switch
High capacity NiMh battery operates vent for up to 24 hours without sunlight on a full charge
Threads into included deck plate and can be removed from outside without tools
Complete air and green water shut-off from below
All Day/Night Plus models come complete with white plastic interior trim ring, insect screen, mounting hardware and an easy-to-understand installation manual
Replaces NICRO 3" and 4" snap-in deck plates (fits existing holes once snap-in deck plates are removed) and Day/Night Plus models