If you want you can even create your door entity to spped up the work. This is suggested only if you are going to put the same kind of door more time in your map.
You have to create a def folder in your mod folder, like
Inside create a new blank text file, then extract the func.def from the q4 pak files (I think the the func.def is on the first pak), then search for func_door inside the def file (you can open def files with notepad or word). Copy the func_door code into your new text file.
Change the header name to something you like, like for example func_mynewdoor, tehn save it with def extension.
Now on your door entity you can change the key/values directly on the def file, much like the sound shader, so each time you create a door in your map instead of converting it into a func_door, you convert it into your new func door already setted up with speed, movedir and everything you need. This will speed up time when building a map especially if you are going to use a lot of the same kind of door.
I usually create 4 doors of the same kind, each one with a different direction move, like one moving toward 0 degrees, 90, 180,270.
Ah another thing, here you can see all the keywords usable in the soundshaders if you want to try them out:http://www.modwiki.net/wiki/Sound_%28keywords%29