Shut-Off Baffle & Sleeve kit for Ventilator In cases of excessive water flow over the decks or coachroof, an inner sleeve complete with flush handle, is closed by moving in an upward direction to ensure 100% waterproofing. This simple operation is carried out from within the cabin or wheelhouse, and vice versa, a downward motion returns the unit to the standard Ventair/Ventilite version. This inner sleeve in no way inhibits airflow under normal circumstances. Inner baffle fits into deck aperture 92mm. Inner baffle depth below deck 18mm.