Professional Installation

•	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.