Greenheck Support Mullions for use in Oversize Openings (462105) - Manual (Page 2)

Support mullion assemblies consist of three basic parts:
the wall mullion cap, the horizontal to vertical mullion cap
and the mullion sections. Determine the quantity of each
piece required to complete the installation.
Fabrication of Wall Mullion Caps
Wall mullion caps must be constructed from 12 ga. steel
with a minimum yield strength of 42,000 psi.
1. Fabricate the formed section as shown to right.
2. Shear the cap end plate to required dimensions.
3. Weld the cap end plates to the formed section with
1/8 in. (3mm) fillet welds completely around the top
edges of the formed section.
4. Drill and countersink 8 holes ( 4 on each side) for
1/4-20 flat head machine screws.
Fabrication of Mullion Sections
Mullions must be constructed from 16 ga. (1.5mm) steel
with a minimum yield strength of 42,000 psi.
Important: The “D” dimension shown has been calculated
to include the necessary clearances required for thermal
expansion in the mullions. The values can be found using
the wall opening dimensions and tables on this page.
1. Form two identical pieces of mullion section as
shown.
2. Connect the two mullion sections together. Use 3/16
in (4.7mm) steel blind rivets of 3/4 in. (19mm) long
intermittent welds 12 in. (305mm) on center and a 6
in. (152mm) maximum from both ends.
Important: Both sides of the mullion piece should be
fastened using the method described above.
Detail B-B
Wall Mullion Cap
H
2 2 1 13 / 16
3 1 / 4
H
E
E/4
E/4
E/4
E/8
3 1 / 4
H
E/8
Formed Section
End View Cap End Plate
(2 req’d)
Weld
Wall Mullion Cap
Assembled View
All dimensions shown are in inches.
2 2 C-4
3 3 / 8
3 / 4
7 / 8
3 1 / 2
D
Formed Section View (2 req’d)
C= Wall Thickness
Assembled View
3/16 in. blind rivet (stl) or 3/4 in.
long intermittent welds 12 in. on
center, 6 in. maximum from both
ends, both sides of assembly.
3/16 in. typical
rivet location
Detail A-A
Mullion Assembly
All dimensions shown are in inches.
Table 1
Dimensional Information shown in inches (mm).
E = Wall Thickness - 1 /
2
in. (13mm)
F = Wall Thickness + 1 /
4
in. (6mm)
Opening Width/Height D H
12 (305) 111/2 (292) 31/4 (83)
24 (610) 231/2 (597) 3 3/8 (86)
36 (914) 33 3/8 (847) 31/2 (89)
48 (1219) 471/4 (1200) 3 5/8 (92)
60 (1524) 59 1/8 (1501) 33/4 (95)
72 (1829) 71 (1803) 3 7/8 (98)
84 (2134) 82 7/8 (2105) 4 (102)
96 (2438) 943/4 (2406) 4 1/8 (105)
108 (2743) 1063/4 (2711) 4 1/4 (108)
120 (3048) 1183/4 (3016) 4 3/8 (111)
Fabrication of Horizontal to Vertical
Mullion Caps
Horizontal to vertical mullion caps must be constructed
from 12 ga. (2.7mm) steel with a minimum yield strength of
42,000 psi.
Important: The H, E and F dimensions shown have been
calculated to provide the correct performance. The values
can be found by using the wall opening dimensions and
Table 1.
1. Form the horizontal mullion channel as shown.
2. Drill 12,
3 / 16 in. (4.7mm) dia. holes into the horizontal
mullion channel using the dimensions shown.
3. Form the center channel as shown.