
3.4 Furnace Cabinet Installation – Not Mounted on a Tank
3.4.1 Ceiling Mount with Threaded Rod
HEAVY!
Use proper lift equipment.
Combustible materials must
not be near the furnace. See required clearances in Section 1.6.
Ceiling Mount Steps (Refer to figure):
1. Determine the desired location of furnace. Determine the length of the 3/8” threaded rod
(3/8 – 16) that will be used to hang the furnace. Measure the hole pattern on the top of
the furnace (where existing 3/8” bolts are). This is your reference for rod spacing.
2. Hang 3/8” threaded rod (4 pieces) from a secure structure such as unistrut. Use flat
washers, lock washers and nuts to secure the rods to the structural member. Leave the
connection just hand-tight until the rod has been threaded into the furnace on the other
end. Next, you will work on the other end of the rods (furnace end).
3. Turn nuts onto the this end of each threaded rod, keep turning until the nuts are several
inches up the rod.
4. Using proper lift equipment, carefully lift the furnace cabinet to the desired location.
Remove the existing 3/8” bolts from the top of the cabinet. Place a lock washer and flat
washer on each rod, while you screw the threaded rod 1” (2.54 cm) into the threaded
holes in the top of the cabinet. After threading the rods 1” into the top of the cabinet,
tighten the nuts. Measure and note the level in both directions, and continue to the next
step.
Bridge /secure structural
steel across structural
ceiling joists or beams.
Make sure that the
resulting structure will
support the loads.
The furnace is hung
from the structure
using 3/8 inch
threaded rods,
fastened to the top
of the cabinet.
(2) Nuts.
Flat Washer.
Structural steel
member (uni-strut,
etc.).
3/8-16 all thread.
Flat Washer.
Lock washer. Nut.
Ceiling Mount (Actual installations vary)
14
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