Isokern FIRE-LITE series, Owner'S Manual

Page: 45 / 59

45
Specialty Applications - Two Story Stacked Installations
General Information:
To install one Fire-Lite fireplace and DM 54 chimney
system above another, as in a two story stacked installation,
both the upper and lower fireplace installations require a con -
crete slab that is supported down to footings via concrete or
steel support structure.
Frequently in two story stacked installations the
lower unit is supported by a slab-on-grade (as in a basement),
whereas the upper unit is a typical off-grade support slab.
The off-grade slab for the upper unit must be built with suf -
ficient width in order to accommodate the width of the upper
fireplace plus the width of the by-passing chimney system
rising from the lower unit. (Figure 83)
The slab for the lower unit will need to be built with
enough width to provide support for the lower fireplace unit
plus the bearing surface for the support columns needed to
carry the offset chimney sequence of the lower system.
(Figure 83)
Floor-to-Floor Height Considerations:
In order for the lower fireplace installation to have
enough overhead height clearance for its chimney to rise at a
thirty degree (30°) angle of offset (maximum angle of offset
as allowed by code) and bypass to one side of the firebox in
the upper location there are minimum required floor-to-floor
height dimensions. (See chart, page 54, Dimension “F”)
The minimum floor-to-floor height required for an
installation is determined by calculating the total horizontal
distance the lower flue must travel to the left or right for it to
bypass to one side of the upper fireplace
(see calculating offsets on page 35).
The total amount of horizontal chimney offset travel
distance will be determined by two factors:
1. The width dimension of the upper unit; and
2. The horizontal distance between centerlines of the pro -
posedupper and lower units.
Example:
For every 3” of horizontal distance separating the
centerlines of the upper and lower units the overall height of
the offset sequence is reduced by one offset block or by 6”.
Notes:
A raised hearth at the lower fireplace will increase
the minimum floor-to-floor height requirement by the height
dimension of the raised hearth.
In the interest of clarity the drawing on pages 45 &
46 (Figure 83 & 84) of the offset chimney sequence does not
show the offset block support columns as required for offset
sequences and as described on page 33 of this manual.
FIGURE 83