The QEF 50 HP Profile Blade Louvre is specifically designed to use with the QEF 50HP Louvre, being a mimic to the front portion of the QEF 50Hp Blade, where a portion of a louvre wall is purely decorative but needs to match the active 50 HP louvre.

QEF 50 HP Profile Louvre Blade Data Sheet QEF-50 HP Profile Blade Data Sheet Rev A