Heatilator • NDI30, NDI30-SP, NDI35, NDI35-SP, NDI30-SPFK, NDI35-SPFK • 2226-900 Rev. G • 4/11 20
7Installation Preparation
Prepare the existing solid fuel masonry or factory built
non-combustible fi rebox for installation.

A. Inspection and Cleaning

Prior to installing the gas insert:
• Have the chimney and adjacent structure inspected
and cleaned by qualifi ed professionals. Hearth & Home
Technologies recommends that NFI or CSIA certifi ed
professionals, or technicians under the direction of certi-
fi ed professionals, conduct a minimum of a NFPA 211
Level 2 inspection of the chimney.
• Replace component parts of the chimney and fi replace
as specifi ed by the professionals.
• Ensure all joints are properly engaged and the chimney
is properly secured.
• Ensure combustible mantel and surround clearances
comply with applicable codes and regulations for solid-
fuelfi replaces. In the absence of local or regional codes,
refer to NFPA 211.
• Ensure chimney is constructed of non-combustible
materials.
• Ensure chimney is clean and in good working order.
• Ensure that all chimney cleanouts fi t properly to prevent
air leakage into chimney.

B. Flue Damper

Fully lock the solid fuel fi replace’s fl ue damper in the open
position, OR completely remove it.

C. Gas Line

Note: If the factory built fi replace has no gas access hole
provided, an access ho le of 1 inch (25 mm) diameter or
less may be drilled through the lower sides or bottom of the
fi rebox in a proper workmanship - like manner. This access
hole must be plugged with non-combustible insulation after
the gas supply line has been installed.
• Install gas line into fi rebox cavity.
• Check local codes and gas line sizing requirements
following NFPA51. See Section 9.
• It is recommended that extra length of gas line be
installed within the existing wood burner or masonry
fi replace to allow removal of the insert for future servicing
needs.

E. Electrical Outlet Box

An outlet box may be installed in a bottom back corner of
the existing solid fuel masonry or factory built fi replace
to power the appliance. Each unit ships standard with a
cord assembly to permit blowers or other optional acces-
sories to be used. The accessories plug into the new out-
let box or may be routed out onto the hearth to a nearby
outlet.

D. Fireplace Conversion Notice

Permanently attach the label with the following warning to
the inside lower back of the fi replace fi rebox into which the
insert is being installed. Silicone or mechanical fasteners
may be required to properly secure the label.
WARNING! Risk of Fire! This fi replace has been con-
verted for use with a gas fi replace insert only and cannot
be used for burning wood or solid fuels unless all original
parts have been replaced, and the fi replace re-approved
by the authority having jurisdiction.