Greenhill EnviroTechnologies Inc.

  • The Company
  • What are Solar Air Heaters?
    Benefits of Solar Air Heaters
    Guide to Build Your DIY Solar Air Heater
    Meredith's Solar Furnace Video/Photo Story
    Videos
    Heater Performance
    Solar Heating Math
    How to measure sunlight strength
    FAQ
  • Products
    About Okapi Systems
    Okapi 1
    Okapi 2
    About the Wireless Module
    About the Fan
    Installation Diagrams
    Instruction Manuals and Videos
    Wire/Fan Customizations and Consultations
    Product Standards
  • Buy Now
    Buy Complete Okapi Systems
    Purchase Light Filter Set
    Terms and Conditions
  • Android and Java Apps
    Okapi Solar App for Android
    Solar Heater Output Calculator
    Okapi Viewer App
    Okapi Viewer App FAQ
    Privacy Policy
    End User License Agreement
  • Contact
  • Benefits of Solar Air Heaters
  • What are Solar Air Heaters?
  • The Company
  • The Founders
  • Greenhill EnviroTechnologies Okapi Fan Control Systems: Variable Speed Fan Controllers for Solar Air Heaters, Solar Furnaces, Solar Space Heaters, Solar Collectors
  • Products
  • About Okapi Systems
  • About the Fan
  • Okapi 1 System Complete
  • Okapi 2.i System Complete
  • Installation Diagrams
  • Instruction Manuals and Videos
  • Product Standards
  • Buy Now
  • Buy Complete Okapi Systems
  • Terms and Conditions
  • Contact
  • A Fan Heater Near the Ceiling?
  • Two 4 x 8 ft Solar Heaters Operated by an Okapi 2.i System
  • Okapi 1 Circuit Board Kit
  • Okapi 2.i Circuit Board Kit
  • Okapi 1 Wire and Sensor Kit
  • Okapi 2.i Wire and Sensor Kit
  • Okapi Fan Kit
  • Okapi Electrical Box Kit
  • Assembly Instructions for the Okapi 1 Kit Set
  • Assembly Instructions for the Okapi 2.i Kit Set
  • Hacking Okapi 2.i: Secrets Revealed
  • Welcome to Okapi Systems: Make the Next Generation Proud!
  • I am building a Huge solar heater. How big a fan will Okapi run?
  • Why are you pushing the heat out at floor level? No one else seems to be doing this.
  • Isn't it bad for the Fan with the hot air blowing through it?
  • Isn't it going against the "natural force of convection" to blow the heat down and out near the floor-level?
  • Can I use a PV Panel to operate my Okapi 2.i System? How many watts should it be?
  • Can I simply connect the Okapi System directly up to a PV (Photovoltaic) Panel?
  • Top Secret
  • WHY are you moving the air from the Ceiling to the Floor? It seems backwards!
  • When connecting Okapi to a PV Panel and Battery system, what kind of battery should I get?
  • What are Solar Air Heaters?
  • About Okapi Systems
  • Contact
  • Benefits of Solar Air Heaters
  • The Company
  • The Founders
  • Greenhill EnviroTechnologies Okapi Fan Control Systems: Variable Speed Fan Controllers for Solar Air Heaters, Solar Furnaces, Solar Space Heaters, Solar Collectors
  • Products
  • About the Fan
  • Okapi 1 System Complete
  • Okapi 2.i System Complete
  • Installation Diagrams
  • Instruction Manuals and Videos
  • Product Standards
  • Buy Now
  • Buy Complete Okapi Systems
  • Terms and Conditions
  • A Fan Heater Near the Ceiling?
  • Two 4 x 8 ft Solar Heaters Operated by an Okapi 2.i System
  • Okapi 1 Circuit Board Kit
  • Okapi 2.i Circuit Board Kit
  • Okapi 1 Wire and Sensor Kit
  • Okapi 2.i Wire and Sensor Kit
  • Okapi Fan Kit
  • Okapi Electrical Box Kit
  • Assembly Instructions for the Okapi 1 Kit Set
  • Assembly Instructions for the Okapi 2.i Kit Set
  • Hacking Okapi 2.i: Secrets Revealed
  • Welcome to Okapi Systems: Make the Next Generation Proud!
  • I am building a Huge solar heater. How big a fan will Okapi run?
  • Why are you pushing the heat out at floor level? No one else seems to be doing this.
  • Isn't it bad for the Fan with the hot air blowing through it?
  • Isn't it going against the "natural force of convection" to blow the heat down and out near the floor-level?
  • Can I use a PV Panel to operate my Okapi 2.i System? How many watts should it be?
  • Can I simply connect the Okapi System directly up to a PV (Photovoltaic) Panel?
  • Top Secret
  • WHY are you moving the air from the Ceiling to the Floor? It seems backwards!
  • When connecting Okapi to a PV Panel and Battery system, what kind of battery should I get?

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