Ag Ventilation Inc

Ventilation Technology For the 21st Century

  Ratcheting Strap Drum Now Available!

  • ​Makes Door Adjustments even more Simple
  • Click on pics for quick hit video examples

Tunnel Doors

Tunnel Doors with our Patent Protected Strap Drive Operating System 

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  • Eliminates all cables and rigging issues
  • Polyester Military grade Straps
  • Direct Pipe to Hub Drive system 
  • Coated Galvanized Steel Doors
  • 304 Stainless Steel Hinges
  • 2 inch thick R9 insulated solid Doors
  • Simple installation!  Tongue & Groove connecting Door sections
  • Available in 5' and 6' heights (custom heights may also be available upon request)


   Installing Ratcheting Strap Drums on other manufactured Doors        

  • Order Retrofit Install Kits for simple installation on your Tunnel Doors