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 the ease of use. 

Features:

- Circulates fresh air in boat cabin eliminating mold, mildew and musty air

- Moves up to 1,000 cubic feet of air/hour or 24,000 cubic feet of air/day (4" model)

- Rechargeable 2500mAh 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 plastic interior trim ring insect screen mounting hardware and an easy-to-understand installation manual

- Replaces NICRO 3" and 4" snap-in deck plates (fit existing holes once snap-in deck plates are removed) and Day/Night Plus models.