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.
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.
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Alternative 44mm wide jamb illustrated on this page.
