Pre-Installation Requirements; Masonry Fireplace Requirements; Venting Requirements - Osburn 2400 Owner's Manual

1.0 PRE-INSTALLATION REQUIREMENTS

1.1 Masonry Fireplace Requirements

The masonry fireplace must meet the minimum code requirements, or NFPA 211 or the equivalent for a
safe installation. Contact your local Building Inspector for requirements in your area. An inspection of
the fireplace should include the following:
1. CONDITION OF THE FIREPLACE AND CHIMNEY:
Examine the masonry fireplace and chimney prior to installation, to determine that they are free
from cracks, loose mortar, creosote deposits, blockage, or other signs of deterioration. If evidence
of deterioration is noted, the fireplace or chimney should be upgraded prior to installation.
2. CHIMNEY CAPS:
Mesh type chimney caps must have provision for regular cleaning, or the mesh should be removed
to eliminate the potential of plugging.
3. LINER:
The chimney must have an acceptable 6" (152 mm) stainless steel chimney liner installed.
NOTE: The 2400 Insert is not approved for use with a positive flue connector into a masonry
flue.
4. ADJACENT COMBUSTIBLES:
The fireplace should be inspected to make sure that there is adequate clearance to combustibles,
both exposed combustibles to the top, side, and front as well as concealed combustibles, in the
chimney and mantel area. Your local inspector should have information on whether older fireplaces
are of adequate construction.
5. OPENING SIZE:
Refer to "Suitable Fireplace Dimensions" (Sec. 2.2) for suitable size fireplace openings.
NOTE:
A METAL TAG IS PROVIDED AND IS TO BE FASTENED TO THE BACK WALL OF THE
FIREPLACE, IF THE FIREPLACE HAS BEEN MODIFIED TO ACCOMMODATE THE
INSERT.

1.2 Venting Requirements

The flue is a critical component to a satisfactory installation. Your insert will attain its best performance
if installed with a flue that generates its own draft. The minimum venting requirement will be the
installation of a flue connector from the insert into the first tile of the chimney (see Figure 2.3). If you are
using a masonry chimney, it is important that it be built in compliance with the specifications of the
National Building Code or other applicable standard having jurisdiction. It must be lined with fire clay
bricks, metal or clay tiles sealed together with fire cement (round flues are the most efficient). Ideally,
the interior diameter of the masonry chimney should be identical to the insert smoke exhaust. You may
also run a stainless steel liner inside the masonry chimney. A continuous 6" (152mm) stainless steel
liner from the top of the chimney to the insert's smoke exhaust (see Figure 2.2) is the optimum system
and will provide the best performance, as well as compensate for poor draft situations caused by large
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