Martin VENT-FREE FIREPLACE SYSTEMS 33ISDG Installation And Operating Instructions Manual page 17

CHECK GAS TYPE: The gas supply must be the same as stated on heater's rating plate.
Located behind the control access door (Figure 1, page 5). If the gas supply is different,
DO NOT INSTALL the heater. Contact your dealer for the correct model. Connecting to
the wrong gas type may result in property damage or personal injury.
To reach factory installed flex line, go through access door on right or left side of firebox.
23D8036
Connecting directly to an unregulated
propane/L.P.G. tank can cause an
explosion.
Figure 18 - Access Holes
CONNECTING THE GAS
Access Door
for Gas Line
Cord Protector
Manual Gas Shutoff
(Recommended Outlet
Positioned Vertical)
Stainless Flex Line
17