"cj" wrote in message
...
i have an enclosed sunroom attached to the side of my house. i can enter
the room through a standard size doorway but i would like to open the
entrance considerably, about 10 feet or so.i guess the way to go would be
to put in an i beam header to support the weight. what size i beam would i
use? the i beam would be part of an exterior load bearing wall.

Any of the W36 sections properly braced and supported should surely be
enough for residential construction. I'm certain it can be made smaller; ask
an architect or structural engineer to render a professional opinion as to
how much smaller.