Check the listing for details. Pactrade Marine 700CU FT Solar Powered Ventilator SS Cover Rechargeable Battery. Condition: New. Listed at 81.95 USD. Measuring 7 1/2" dia. and 3" H, this water resistant 3" solar powered ventilation comes with rechargeable battery and switch. Two blades (exhaust and intake) are provided with each vent. It moves up to 700 cu.ft./hr of air during the day on solar power while charging a rechargeable battery to run at night. Ventilation can run on battery for 24 hours at full charge. It is constructed with high impact stainless steel cover and stainless steel screws are included. No wiring is required during installation and it comes with a ON/OFF switch. Cutout size 3 3/4" Installation If you are unsure how to fit the solar vent yourself, consult a professional installation expert. Do not remove any screws that are preinstalled from the vent as this is not needed for installation.