Large Span Conservatories are, in fact, conservatories that incorporate an independent structural support frame that is commonly known as a "portal". With a portal integrated into your design it supplies the support necessary to achieve large and complex conservatory designs to span great distances with no vertical support beams to clutter the living space.
Whether you need to span a large distance for a pool enclosure or a commercial conservatory project, a Portal structure becomes necessary when one of the following is valid: