The next generation  of closure solution

Inside setting

No any sill

door leaf makes descendant moving, so we can use same steel building as for outside and set it above of the floor for permitting compression of join on the floor.

• door leaf (blue) set at distance of the floor
• Join (black) set up under
• Floor without transformation

Technical result

1. Airtightness of room 
2. Floor preservation
   

Slant can be partial, for example at the half of the panel thickness, in order to be more inclined for pressure resistance.