Nailing Fin Frame:
The head and jambs
have a built-in nailing fin / weather
bar to make installation into
cavity brick and brick veneer as
detailed
on this page.
Sub-sill:
The standard sub-sill also has
a built-in nailing fin
to facilitate the
sill installation.
Lugs:
The nailing fin frame can be fitted
with a dedicated adjustable galvanised
steel building-in lug. This
is
important on brick installations
if you
don't want angle trim
fixings with
visible fasteners.
Alternative: 44mm
wide jamb illustrated on this on this page.