||08-11-2007 02:57 PM
Just curious for starters, why did you purchase an exterior unit to use in this location?
For the question.. sure you can remove the big sill. You want to do this before setting the unit, as it is screwed in through the sides of the jambs. To ease the handling of the unit, before removing this, lay the unit on the floor , bump it around until all the reveals look good, then screw a piece of 1 x 6 or a rip of plywood across the jambs about a foot from the bottom, this will keep the bottom from spreading when you handle it. Also check the size of the gap there is now going to be from the bottom of the doors to the ends of the jambs, as once you have removed the typical exterior sill and any sweeps on the bottom of the doors. you will probably need to trim the jambs a bit so you don't end up with an overly large gap between the doors and the finish floor.