Pactrade Marine Boat 700CU FT Solar Powered 24HRS Ventilator Stainless Steel Cover Measuring 7 1/2" dia. and 3" H This water resistant 3" solar powered ventilation has two blades (exhaust and intake) that are provided with each vent. It moves up to 700 cu.ft./hr of air during the day on solar power Battery and switch are NOT provided for this item. Item: P13023ss