Ventsetter Greenhouses THE VENTSETTER SERIES GREENHOUSE: 5 Great Options For Those Who Want Connected Units Ventsetter Original Square/round pipe, slight Gothic style for those wanting 2 or more gutter connected structures. Modified sawtooth. Ventsetter Series 4000 Roll form true sawtooth structure. Economical, available with overhead retractable shade system. Many outstanding features. Designed for 2 or more houses. Ventsetter Series 5000 Modified sawtooth. Large vent to gutter. Roll form. With arched roof. Designed for 2 or more houses. XA 300 Maxi-Vent Can be built as single house or gutter connected. Modified Gothic. Great mechanical ventilation. 30 ft wide XA 210 Maxi-Vent Designed as single house. 21 ft wide. Great air ventilation.