Description Exaco Intake Shutter Vent The exhaust fan is best purchased with the Intake shutter fan to maximize its effect, as the exhaust fan gets rid of warm air in the greenhouse, the intake vent allows for proper circulation of fresh air in the greenhouse. Features & Benefits of Exaco Exhaust Fan Anodized construction reduces rust and corrosion Material: Anodized aluminum Allows for cooler fresh air to travel across the entire structure Gives your greenhouse maximum ventilation and prevents and controls pest Aids pollination Easy installation and requires minimum maintenance Usually positioned in a high location in the back wall Pre-wired with 9 ft plug-in cord, 110v Optional thermostat with 8' cord and plug Available sizes for Exhaust Fan: Fan Size Recommended for Models Thermostat Controller Opening Size Placement Power Cord Length 12" RIGA 2, 3, 4, J-Vics, VI 23 VC115-C 12.25" x 12.25" High location in back wall 9 feet 16" RIGA 5, VI 34-46 VC115-C 16.25" x 16.25" High location in back wall 9 feet 20" RIGA XL VC115-C 20.25" x 20.25" High location in back wall 9 feet Optional Intake shutter vent and thermostat Intake shutter vent: Positioned lower – highest position in the lowest panel in the front wall Available sizes for intake shutter vent: 16in: Opening needed 16.25″ x 16.25″ 20in: Opening needed 20.25″ x 20.25″ 24in: Opening needed 24.25″ x 24.25″