EFCO 525 Series - Manual (Page 34)

SECTION VIII-FRAME INSTALLATION
[FIG. 45]
B. SHEAR BLOCK
PAGE 32
(CONT.)
SUBSILL
CONDITION
ASSEMBLED
FRAME
Because of the design of the shear blocks for the 525 system, EFCO
recommends that the shear block framing be used in punched
openings only. It would be possible to stack modules side by side in
a longer run. However, the last module could not be installed without
an extremely large caulk joint at the jamb of the last module installed.
For this reason, the shear block framing system should be used for
openings where the frame can be fully assembled and positioned into
the opening as a single unit.
STEP 1) INSTALLING SHEAR BLOCK FRAMES
STEP 2) SHEAR BLOCK FRAME ASSEMBLY
Begin the installation process by assembling the shear block framing
as shown in figure 11 on page 14. Once the unit has been
assembled, position the unit to the exterior of the subsill. Ensure that
the subsill has been installed and sealed correctly according to the
instructions on pages 20-25.
525 IMPACT DPS 1/2004