DUROMAX XP13000HXT User Manual page 13

As the only safe way to use a portable generator, taking your
generator outside is absolutely mandatory to keep your family
safe from carbon monoxide. But there's even more you can do.
By educating yourself about all carbon monoxide risks, you'll
be better prepared to protect your family from this colorless,
odorless threat. Visit takeyourgeneratoroutside.com for more
information.