XF 1.5 Keep threads in specific nodes from showing up in "New Posts"?

I always get vendors asking me to set up a section for them on my forum. I don't mind doing this, but I don't want their posts to show up in "New Posts" since they're likely to spam coupons and whatnot. Is there a way to keep a certain node's threads/posts from showing up in "New Posts"?

Thanks!
 
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