They can be burned before anything without limits; like in front of a door, or open window as an offering.

Near it, a man with his back to her stood beside a small fire that burned almost without smoke.

He put more wood on the fire and it still burned bright without any smoke.

He stared into flames that burned without need for fuel.

We can even burn our flag, as a political protest, without fear of punishment.

Essentially, these buildings burn fuel 24 hours a day, without regard for how hot or cold people feel.

Am I to be burned as a heretic, without even a chance to defend myself?

Yet, Spook had tried to burn other metals without success.

An added bonus in such a case is that someone would be able to burn more calories without feeling he was having to work harder.

By the year 1000 the fort seems to have been deserted and shortly after had simply burned to the ground without any evidence of fighting.