Abstract: A device is disclosed providing an adjustable endcap for use with distribution conduits in a greenhouse. The device provides a solution to seal off the end of a distribution tube while providing further means to regulate the distribution of substances such as air or gas. The device comprises a structure for sealing the end of a greenhouse distribution tube wherein the sealing structure can be freely adjusted to allow variable amounts of air or gas to escape from the sealed end. The device allows for further regulation of pressure and temperature inside the conduit, extension of climate control over a greater distance and the ability to regulate conduits on an individual basis.

Abstract: A greenhouse is disclosed that generally comprises an enclosed growing section with an enclosed end gable adjacent to the growing section. The end gable is arranged to flow air into the growing section. Air distribution tubes are included within the growing section with the tubes arranged to provide for substantially uniform air flow into the growing section. The air tubes can also be arranged to compensate for heat differential between the air in the tubes and in the growing section.

Abstract: A greenhouse is disclosed that generally comprises an enclosed growing section with an enclosed end gable adjacent to the growing section. The end gable is arranged to flow air into the growing section. Air distribution tubes are included within the growing section with the tubes arranged to provide for substantially uniform air flow into the growing section. The air tubes can also be arranged to compensate for heat differential between the air in the tubes and in the growing section.