The Solatube 21-O brings high performance daylighting to areas without a ceiling such as warehouses, factories, gymnasiums, sports halls, etc. This system uses 99.7% Spectralight® Infinity tubing to bring the diffuser below any light-absorbing roof structures to deliver diffused natural light to the area below. This system is also ideal for retro fits because it can be installed from the roof, eliminating the need for interior scaffolding or lift systems, and minimal disruption to staff and production activities.

• Polycarbonate roof dome
  
  
• Light Tracker™ dome reflector
  
  
• Top tube assembly incorporating 0-30° adjustable angle (380mm long)
  
  
• 610mm long 99.7% Spectralight® Infinity extension tube
  
  
• Diffuser 530mm Ø curved prismatic lens
  
  
• Roof flashing
  
  
• Fasteners
  
  
• Full installation instructions