58
Specialty Applications - Two Story Stacked Installations
General Information:
To install one MAGNUM replace and DM 54 chim-
ney system above another, as in a two story stacked installa-
tion, both the upper and lower replace installations require a
concrete 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-
cient width in order to accommodate the width of the upper
replace plus the width of the by-passing chimney system
rising from the lower unit. (Figure 121)
The slab for the lower unit will need to be built with
enough width to provide support for the lower replace unit
plus the bearing surface for the support columns needed to
carry the offset chimney sequence of the lower system. (Figure
121)
Floor-to-Floor Height Considerations:
In order for the lower replace 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 rebox in
the upper location there are minimum required oor-to-oor
height dimensions. (See chart, page 54, Dimension “F”)
The minimum oor-to-oor height required for an
installation is determined by calculating the total horizontal
distance the lower ue must travel to the left or right for it to
bypass to one side of the upper replace
(see calculating offsets on page 41).
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:
If the upper replace and the lower replace sit on
the same centerline then the required oor-to-oor dimension
is at a maximum (See Figure 122 and chart, page 50 dimen-
sion, column “F”.)
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 replace will increase
the minimum oor-to-oor height requirement by the height
dimension of the raised hearth.
In the interest of clarity the drawing on pages 58 &
59 (Figure 121 & 122) of the offset chimney sequence does
not show the offset block support columns as required for
offset sequences and as described on page 47 of this manual.
FIGURE 121
To Next Page
Loading...
Need help?
General
