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Hi I’m installing a bi fold patio door in replacement for a window, we have a cavity wall 1966 build house. Inside wall has a concrete lintel but nothing on the exterior leaf Should I just put a catnic ccs / single leaf lintel in or is it best to put a cavity wall lintel? Patio door is 2140...

Hi I’m installing a bi fold patio door in replacement for a window, we have a cavity wall 1966 build house. Inside wall has a concrete lintel but nothing on the exterior leaf Should I just put a catnic ccs / single leaf lintel in or is it best to put a cavity wall lintel? Patio door is...