Stegbar timber internal bi-fold doors and room dividers
ALAFORM Bi-Folding Door Show Room - modern - front doors - other metro - ALAFORM Bi-Folding Door Systems Co., Ltd.
Google Image Result for http://tgnorris.com/assets/images/KITCHEN_EXTENSION_PLANS_3.jpg
Newland Pine French Doors 1981x1168mm - Internal French Doors - Interior Timber Doors -Doors & Windows - Wickes
Room divider how to- The room divider folds neatly to the wall.
Primed 4 Panel Shaker Glazed | Internal Stile & Rail Doors | Doors & Joinery | Howdens Joinery
knocking through a kitchen and dining room - Google Search
could be good as the utility door???
Light hallway with oak doors...again
Bifold doors which can act like patio doors in case you only want to go into the garden or let in some air. but not these faux-Georgian