One disadvantage with this ceiling system is the reduced headroom. Clearance is required between the grid and any pipes or duct work above to install the ceiling tiles and light fixtures. In general, a minimum clearance of is often needed between the lowest obstruction and the level of the ceiling grid. A direct-mount grid may work for those who want the convenience of a dropped ceiling but have limited headroom. Stretch ceiling supports require less than one inch of vertical space, and no space is required for tiles to be lifted out with a stretch ceiling, but a greater clearance space may be chosen to allow room for MEC or for aesthetic reasons.