Terms and Conditions:

(This page, Terms and Conditions, is subject to change. Please check back from time to time to update yourself of any changes. We will highlight any significant changes if they occur, over time, in the Amendment section at the bottom of this page.)


The Okapi Fan Control System is designed to be used with a closed-loop solar air heater. It is programmed to detect warm air convecting upwards from within a closed-loop solar air heater and to then control the speed and direction of air-flow from within the building to be heated, through the solar air heater and back into the building. The Okapi Systems are specifically designed to pump air from the ceiling level of the room to be heated, into and through the solar air heater collector box and then pump it back out at floor level into the room to be heated. The optimal functionality of the Okapi Fan Control System cannot be guaranteed if used to pump hot air out at ceiling level (with the inlet at floor level) or if used with an open-loop solar air heater.

The Okapi Fan Control System is not designed for use in wet conditions, such as outdoor use or in rooms that may flood.

Any other uses of the Okapi Fan Control System, other than the ways described above and further in this manual, may result in poor functionality of the fans, create potentially dangerous situations or cause physical harm to people, animals, or objects. 


This product is intended to be assembled by a qualified person. This product is not intended to be assembled or installed while mentally-impaired, or by children.

This product contains an AC/DC power adapter. Always use caution when plugging it into a power source. 

A life-threatening electrical shock may occur if correct caution is not used when plugging or unplugging the Power Adapter or if the Power Adapter remains connected to a power supply while you are working with or adjusting any part of the Okapi Fan Control System. If you are uncertain how to plug in your power adapter correctly, consult an electrician. Always unplug the Power Adapter during assembly, installation or adjustment of the Okapi Fan Control System. If you choose to connect your Power Adapter to a power supply other than a standard 120V power electrical socket, such as connecting it to a battery-power source, you do so at your own risk.

Do not attempt to connect or disconnect the power adapter if conditions are wet (example: flooding in the building).

A life-threatening electrical shock or risk of fire is possible if the control box is opened and the circuit board is exposed. Do not open the control box.

This product contains very powerful fan(s). Serious bodily harm may occur if you or any object comes into contact with the spinning blades of the fan(s). 

Do not under any circumstances insert a body-part or object into the fan while it is running. A fan-blade may break when it comes into contact with an object or the fan may break an object that it comes into contact with, resulting in dangerous projectiles.

Keep fan(s) away from children and animals. The fan(s) come equipped with a finger guard for protection. 

Ensure this finger-guard remains on and secure at all times and is facing into the room to be heated once the fan is installed.

The temperature of the air the fan(s) blow into the room can exceed 120°F (49°C), depending on the functionality of your solar air heater collector box and weather/environmental conditions. This temperature is high enough to cause potential injury or damage to people, animals, plants or objects.  

Always ensure there is a minimum of 4ft (1.2m) of space around the hot-air Outlet(s) for safe and adequate dispersal of the heated air into the room. Do not place any furniture, children’s furniture or toys, animal enclosures or toys, plants or any temperature-sensitive objects within 4ft (1.2m) of the hot-air Outlet(s).

Always ensure there is adequate (a minimum of 2ft, 60cm) of space around the room-air Inlet(s). This will allow the air-flow into the solar air heater collector box to be unimpeded and optimal.

  • If you have purchased or acquired a power adapter elsewhere, check that the power adapter you purchase is FCC approved or CE marked and follows the 4 specific requirements described on the purchase page.
  • If you connect a faulty of incorrect power adapter to your Okapi System, you risk blowing the fuse on the circuit board, having a poorly functioning Okapi System, damaging your Okapi System, or worse, starting a fire due to an incorrect/faulty/unregulated power adapter. 
  • You are connecting your self-acquired power adapter at your own risk.


Greenhill EnviroTechnologies Inc. shall not be liable for any damages of any kind resulting from the purchase, use or misuse of, or inability to use the product, including incidental, special, consequential or similar damages or loss of profits, or for any breach of contract, fundamental or otherwise, or for any claim brought against the purchaser by any other party. 

Greenhill EnviroTechnologies Inc. shall not held liable for any damages, financial loss, injury or harm caused by your connection of a power adapter you have purchased or acquired elsewhere. 

1 Year Limited Warranty:

Greenhill EnviroTechnologies Inc. warrants that for a period of one year from the date of purchase, our products will be free from defects in material and workmanship. Greenhill EnviroTechnologies Inc, at its option, will repair or replace a product or any component of the product found to be defective during the warranty period. Replacement will be made with a new or re-manufactured product or component. If the product is no longer available, replacement will be made with a similar product of equal or greater value. This is your exclusive warranty. DO NOT attempt to repair, alter or adjust any electrical or mechanical functions on this product. If your product was a Kit of any kind, DO NOT attempt to repair, alter or adjust any electrical or mechanical parts, other than the alterations or adjustments required and clearly stipulated in the Kit Assembly Instructions for completing the Kits. Doing so will VOID this warranty.

This warranty is valid for the original retail purchaser from the date of initial retail purchase and is not transferable. Keep the original sales receipt, as proof of purchase is required to obtain warranty performance.

This warranty does not cover normal wear of parts or damage resulting from any of the following: negligent use or misuse of the product, failure to follow Kit Assembly and Building Instructions; damage resulting from connecting an incorrect/faulty power adapter; making Kit-assembly and Building errors, such as: mistakes made by the user causing functional damage to any part the circuit board (while soldering wires into place on the Circuit Board Kits, while handling the circuit board, while installing the circuit board in the Box Kit,), damage caused by leaving the circuit board in an unprotected environment (such as not housing it in a proper electrical box, of similar quality to the box provided with our Box Kit); mistakes made by the user causing damage to the wires while stripping insulation from wires for the Wire and Sensor Kits; mistakes made by the user while assembling connector receptacles onto wire pins, mistakes made by the user causing damage to the Circuit Board Box Kit or Fan Kit; damage resulting from attempting to repair or alter the electrical or mechanical parts of the product, other than what was clearly stipulated in the Instruction Manual; damage from use of improper voltage or current, use of an improper Power Supply Unit; use contrary to the installation and operating instructions; dis-assembly, repair or alteration of other parts of the circuit board and system, (other than those stipulated as part of the assembly and build instructions of the Kits) by anyone other than Greenhill EnviroTechnologies Inc. or an authorized Greenhill EnviroTechnologies Inc. service center.

Further, the warranty does not cover damage resulting from ‘Acts of God’, such as fire, flood, severe storms, hurricanes, lightning strike damage, earthquakes, kit-assembly or kit-building errors, mistakes and accidents, etc.

Refund Policy:

If the product you ordered is not what you expected or does not perform to your satisfaction, contact us immediately. You have 7 days (date of post-mark of the returning package from when it was confirmed to be delivered to you) to mail it back to us. Once we have received the returned product and deem that it has not been damaged by negligence or misuse (see Warranty), we will issue you a full refund of the price you paid on your purchase receipt. We will not refund the cost of shipping to return the product to us.

(Last updated November 23, 2015)