I recently bought a metal fire-rated door at Lowe's for the doorway from my house to my garage. In putting it into my van, it bumped into a dolly cart. I was surprised to see that it was dented from the bump. If it is dented so easily in transport, it surely will be dented in ordinary use. I returned the door.
So how do I find an inexpensive fire-rated door that is more durable, perhaps dent-resistant? The salespeople seem to think that all metal doors could dent and that all fire doors they might sell are just about the same.