Installation and Operation
5
26D4720
MCUF Series Vent-Free Firebox
The MCUF36 and MCUF42 Series are vent-free reboxes.
They feature a self contained heat-circulating system.
This installation manual will enable you to obtain a safe,
efcient and dependable installation of your vent-free
rebox.
Do not alter or modify the rebox or its components under
any circumstances. Any modication or alteration of the
rebox system, including but not limited to the rebox and
accessories, may void the warranty, listings and approvals
of this system and could result in an unsafe and potentially
dangerous installation.
Carefully inspect the contents for shipping damage. If any
parts are missing or damaged, immediately inform the
dealer from whom you purchased the appliance. Do not
attempt to install any part of the appliance unless you have
all the parts in good condition.
Check your packing list to verify that all listed parts have
been received. You should have the following:
1. Vent-Free Gas Firebox
2. Canopy
3. Installation and Operating Instructions
4. Five (5) sheet metal screws for canopy
• Phillips screwdriver • Square
• Framing materials • Hammer
• Saw and / or sabersaw • Tee joint
• Level • Pipe wrench
• Measuring tape • Pliers
• Electric drill and bits
• Fireplace surround materials (noncombustible)
• Caulking material (noncombustible)
• Piping complying with local codes
• Wall nishing materials
• Pipe sealant approved for use with propane/L.P.G.
(resistant to sulfur compounds)
Refer to the installation instructions provided with the log
sets for items required for log set installation.
In planning the installation for the appliance it is necessary
to determine where the unit is to be installed and whether
optional accessories are desired. Gas supply piping should
also be planned. The following steps represent the normal
sequence of installation. Each installation is unique, how-
ever, and might require a different sequence.
1. Position rebox prior to framing or into prepared fram-
ing.
2. Field wire main power supply to models with fan kit.
(Electrical connections should only be performed by an
experienced, licensed /certied tradesman).
3. Plumb gas line. (Gas connections should only be per-
formed by an experienced, licensed/certied trades-
man).
4. Install vent-free gas log heater per the instructions
provided with the vent-free gas log heater.
5. Complete nish wall material, surround and optional
hearth extension to your individual taste.










