a wood or metal structure built over a weather-deck opening to afford light and ventilation to the spaces below. The top covers are flat or pitched and are provided with hinges. They can be raised or , lae valgusluuk. Keiluti klaasid on pealt kaitstud kaldrestiga. Ilusa ilmaga kasut keilutit ka õhutamiseks, tormi ajaks kaetakse keilut purjeriidest kattega.