Chimney Requirements - Heatilator NA36 Installation & Operating Instructions Manual

3. Sidewalls/Surrounds
Adjacent combustible side walls must be located a minimum of 12” from the fireplace opening. See Figure 6. If you
are using a decorative surround constructed of combustible material, it must be located within the shaded area
defined in Figure 6. Short stub walls are also acceptable if they are contained within the shaded area.
When planning your fireplace location, the chimney construction and necessary clearances must be considered. The
fireplace system and chimney components have been tested to provide flexibility in construction. The following figures are
the minimum distances from the base of the fireplace.
12
E. CHIMNEY REQUIREMENTS
Minimum overall straight height
Minimum height with offset/return
Maximum height
Maximum chimney length between an offset and return
Maximum distance between chimney stabilizers
Double offset/return minimum height
Maximum unsupported chimney length between the offset and return
Maximum straight unsupported chimney height above the fireplace
17789 Rev H
NA SERIES INSTALLATION INSTRUCTIONS
13 ft.
14.5 ft.
90 ft.
20 ft.
35 ft.
24 ft.
6 ft.
35 ft.
07/03