it`s only the glass unit that needs replacing.
remove the beading and take out the glass unit. measure the width, height and importantly the thickness. they are of varying thickness eg.
22mm 24mm 28mm. also check if it is toughened glass, there will be a kite mark if it is. now if any unit from floor level to visible level of glass is below 800mm then it has to be toughened but you can change like for like. also is the inner pane of glass `k` glass? go to a glass manufacturer not a window manufacturer it`s much cheaper.
levilewy, September 2010