Remove specific page/post from feed

I’m working on a website with lots of tutorials/pages.

I have made a separate rss feed for the pages – works fine.
But then I had to create a sitemap (a page), and it shows up in my “pages” rss feed!

My Question: How can I remove a specific post/page from a feed?

The quick and dirty way is set the published date a year or so in the past, past the oldest posts in the feed. There’s also a nice plugin for this – Stealth Publish – where you set a flag in a custom field to exclude it from feeds and the home page feed.