Give your boat the at-home look with real-wood grilles. Available in teak, however many other woods are available, including cherry and maple, with a special order and minimal price difference.
Kits are available using either wood grilles or plastic grilles.
Return-air grilles have easy-to-clean, replaceable filters. Supply-air grilles have double-deflection, moveable louvers which can be removed for easy cleaning. Transition Boxes (plenums) are needed for supply air grilles.