Heatilator • NDI30, NDI30-SP, NDI35, NDI35-SP, NDI30-SPFK, NDI35-SPFK • 2226-900 Rev. G • 4/11 18
B. Mantel and Wall Projections
WARNING! Risk of Fire! Comply with all minimum clear-
ances to combustibles as specifi ed. Framing or fi nishing
material closer than the minimums listed must be construct-
ed entirely of noncombustible materials (i.e., steel studs,
concrete board, etc).
Clearance to combustible material under the insert is 1/4
inch (6 mm). Clearance from top of fi replace opening for
combustibles extending 12 inches max. is 12 inches.
• Use leveling legs to raise insert minimum 1/4 inch (6 mm)
above combustible material or outer wrap of factory built
fi rebox.
Combustible facings must not extend behind the insert
surround. For non-combustible material specifi cations
refer to Section 1.E.
Figure 5.3 Mantel Clearances
12 IN. MIN.
12 IN. MAX.
EXISTING NON-COMBUSTIBLE FACING
Figure 5.2 Fireplace Opening - Deep Surround
CD
SURROUND
APPLIANCE
1-1/2 IN.
BD
AD
APPLIANCESURROUND
MINIMUM FIREPLACE SIZE
Location
NDI35 NDI30
Inches Millimeters Inches Millimeters
ADAlternate Unit Width 33-3/16 843 29-1/16 738
BDAlternate Unit Depth 15-1/16 383 13-7/8 352
CDAlternate Unit Height 22-9/16 573 19-1/16 484
* Note: If exhaust collar on insert and fi replace damper do not line up, add 4 inches (102 mm) to minimum
fi replace height for bends in vent pipe.
TOP VIEW
SIDE VIEW