[jeffba]

Cutting a hole for that will most likely void your Montana warranty

you better plan on owning your Monty forever.

They will need to be able to bolt to the floor when in transit.
It will need to be installed in a way to not interfere with the slides

Follow the installation process to the letter.

make sure it is cleaned monthly.
double up on CO and Smoke detectors.

Make sure your insurance does not have heartburn.

Make sure your installer is doing it right.

Past life I was a volunteer fireman.

Past life I was a chimney sweep and installer.

If there is no published code for this type of installation, I would not have touched it.
You will be able to find someone to install it-- just doesn't mean it is right.


I would look ling and hard at getting a 100 gal propane tank.