System 4 - Conservatory System 4 - Conservatory System 4   System 4 Aluminum Conservatories... Victorian Conservatory... An American Conservatory you can afford. Four Seasons System 4 Aluminum Conservatories have classic traditional styling combined with structural integrity, versatility and the unmatched insulation and solar control glazing available with all Four Seasons models. Features include all around sliding windows with insect screens and a choice of sliding or French swing doors. Traditional embellishments available include: ridge cresting, finial, dentil moulding and etched glass on transoms and French doors. French doors are either inswing or outswing. Georgian Conservatory... Exceptional use of space, dramatic ceiling height and maximum window openings. As with our Victorian Conservatory, the Georgian Conservatory is inspired by traditional English design and comes with the same unique options. Because the sides are square rather than segmented you actually have more floor area and a very spacious feeling.