The basics done better, JELD-WEN V-2500 Series Vinyl patio doors are made to be durable, energy efficient and attractive for many years to come. For a more modern appeal, sliding patio doors offer maximum views and save space where swinging doors are not feasible. Nail fin frames are ideal for new or replacement construction in a typical wood frame structure - commonly referred to as stick-built construction. Nail fins can be easily removed for pocket or block frame installation into wood, concrete or masonry walls with little disruption to the interior and exterior trim. Local building codes often require stronger, safer glass to be installed where there is a risk of people bumping into it, such as patio doors. To meet these building codes, glass must be tempered (or heat treated) so that if it does break, it will break into small, dull pieces rather than razor sharp shards that can cause serious injury.