This is a great way to get a gas fireplace into any space you wish! See the following blog post from Heat-n-Glo manufacturers for more info.
To state again, a pre-fabricated fireplace system is also known as a "zero-clearance" fireplace. This is a fireplace made from a kit, that does not require any masonry. The components can be placed very close to combustibles without catching them on fire. These systems are common in apartment complexes, as well as single-family Dwellings. In the trade, we use round brushes that are soft to clean the flues, which are round metal piping. Over the last 24 years I have had possibly 5 customers that had the operating manual for the system. There is a right way (and a wrong way) to use these systems. Stay tuned for more data on operating these systems.
The people at the USDA Forest Service probably know a thing or two about firewood and its use…
Go to this link for some great data:
The above photos are of extremely flexible PVC rods and of a poly brush. This equipment is ideal for cleaning light-weight stainless steel all-flex liners. These rods and brushes navigate bends in flexible liners very easily. The rods and brushes in the photos below are very stiff, and can get caught up in a flex liner, and possibly rip the liner. They should not be used: