Osburn OB02401 - Manual (Page 9)

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2.4 The masonry fireplace's draft control system
If the fireplace's draft control system is to remain in the masonry fireplace, it must be locked open
for access of the chimney liner or removed entirely. If you remove draft control system from the
masonry hearth, you will need to install the metal plate (27009), supplied with the owner’s manual
kit, indicating that the masonry hearth has been modified. It must be secured inside the masonry
hearth, in a visible place and easy to locate.
2.5 Compliance of a combustible top shelf
To ensure compliance of an existing top shelf or to install any combustible shelf, refer to table
below and Figure 2.5 for a safe installation or to perform changes if necessary. For example, a
shelf with a 6’’ depth (152 mm) must be installed at least 25 1/2" (648 mm) above the top of the
insert (see Figure 2.5). Different shelf dimensions are listed in the following table in order to
facilitate installation. However, no combustible shelf can be installed at less than 25 1/2"
(648 mm) above the top of the insert. If the depth of the shelf is not listed in the table, add 19
1/2" (495 mm) to the depth of your shelf to obtain the safe positioning of your shelf. For example,
for a 9" (229 mm) shelf, the safe positioning would be 28 1/2" (724 mm) above the top of the
insert (19 1/2" (495 mm) + 9" (229 mm)).
SHELF POSITIONING
MAXIMUM SHELF
DIMENSION (X)
SHELF POSITION
( I )
6" / 152 mm 25 1/2" / 648 mm
8" / 203 mm 27 1/2" / 698 mm
10" / 254 mm 29 1/2" / 749 mm
12" / 305mm 31 1/2" / 800 mm