Quote Originally Posted by Heart Of A Lion View Post
When I look at my table, then I see that дверь ends with -ь and when I then look at the genitive singular for that ending, I see -я, so then according to my table I get дверя. Which is a bit confusing, because I got that row of endings from the following Wikipedia page, which also lists exceptions under the table. So perhaps дверь follows the declension pattern of an unlisted exception on Wikipedia?: Russian grammar - Wikipedia, the free encyclopedia
Дверь is feminine. You should use "Third decl. f." row of your table.

дверь - двери - двери - дверь - дверью - двери; двери - дверей - дверям - двери - дверьми - дверях