Methods and apparatus for providing a gas tight enclosure

A closure assembly comprising:

• a plurality of tubular inflatable seals;
• a sliding door comprising a first portion and a second portion, said first portion having an opening therethrough, said door further comprising a plurality of grooves encircling said first portion and a plurality of grooves encircling said second portion, said grooves encircling an area slightly larger than the opening, said inflatable seals configured to fit into at least one of said grooves encircling said first portion and at least one of said grooves encircling said second portion;
• and
• a frame configured to allow said door to slide back and forth within said frame, said frame comprising a middle opening for allowing objects to pass therethrough when said first portion of said door is aligned with said middle opening, said frame further comprising a top opening and a bottom opening, said top opening and said bottom opening allowing said inflatable seals to be changed without removing or disassembling said door from said frame, said seals allowing a sealing of either of said first portion or said second portion of said door around said middle opening of said frame.