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Floor joists are on 16-inch centers. If you cut away one joist, the
next two are then on 32-inch centers. Because of the thickness
of the joists, that means there is about 30 1/2 inches of space
between them—just enough for the biggest floor furnace, Model
7088, which is 30 inches wide. The smaller furnaces will need an
additional support along the one side (see 10), or on both sides
if you are centering the furnace between two joists because loca-
tion is critical. If the location is not critical, it is easier for you to
put the furnace against a joist and then fill in with one additional
support.
Floor to gas inlet
Floor to shield
Floor to Flue C.
Overall height
Casing length
Casing width
Register length
Register width
Model No. A B C D E F G H I
3588 22 3/4 34 3/4 20 32 24 15 1/4 10 1/2 18 1/2 4 D.
5088 24 3/4 36 3/4 22 34 26 16 3/4 12 3/4 20 1/4 4 D.
7088 32
3/4 36 3/4 30 34 27 15 1/4 12 3/4 20 1/4 5 D.
Flue C. size
*Dotted lines show the gas valve and flue collar for Model No. 3588 only. (Same side)
3588 only
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