Proper ventilation is imperative to prevent a buildup of moisture that will promote the growth of mold and mildew winter or summer. Damage to interior fabrics and electronics as well as the unpleasant odors of a musty boat are eliminated with proper ventilation. I've never had a problem with mildew in my 20 year old boat because I added a solar vent before I ever sailed it.
Especially important on smaller boats where space is at a premium, our low profile vent is unobtrusive on deck as it sits only 2-3/8" high. A fan moves 1000 cubic feet of air per hour. The solar cell runs the fan and charges a built in battery. The fan will continue to run for up to 40 hours during nights or bad weather when the sun is not available.
The vent is designed with a damper that can be closed from inside the boat to stop airflow or when you're taking green water over the bow. Two blades are provided so it can be used as either an intake or exhaust vent. An insect screen is also included as is a switch to turn the fan off.
Fits a standard 4-3/4" vent hole cutout in the deck which makes it compatible with Nicro vents built in the past. Outside diameter is 9". Stainless steel cover.
1) If you have a 3" vent and would like to install this 4" vent, here is a trick: Since there is already a hole in the deck, there is nothing for the pilot bit to drill through. Use both 3-3/4" and a 4-3/4" hole saws. Place the 4-3/4" saw on the mandrill first. Now screw on the 3-3/4" saw inside of it. The smaller saw will act as the pilot as the larger saw bores a nice, clean 4-3/4" diameter hole!
2) There is a plastic version of this vent available for about $20.00 less but we don't carry it. In our experience the white plastic housing yellows when exposed to UV light. In a year or two the vent looks old and funky. The stainless shroud on our vent covers the plastic housing and still looks new for years.