Amazon.com: Blackout Shade for Regular Hatches with Built in Ventilation | Blackout, Ventilation and Bug Screen (1320) Hatch is not Included : Sports & Outdoors
Get Air Down There: How To Improve Ventilation On Any Boat | BoatUS
Gebo 10 3/4 X 10 3/4 Inch White Aluminum Boat Ventilation Hatch