I think it can be done but you will need to have a combination that is running at about 50% of its actual capability while running flat out on your power supply, especially in Israel with the temperature variations.

The Lander fans are no use, the motors are not going to last an hour constant running let alone a day, cheap chinese is not what you need.

If you can feed the fan with 14-15v and up to 50A supply, I can build you a 70mm CNCalloy fan with a very tough motor that will run for extended periods easily. The fan housing will be CNC machined alloy, running a very tough German made Wemotec rotor and an ARC motor. On 14.5v this setup will pull around 45 amps/650 wattsand provide around 1.2kg static thrust or so out the back. The motor is capable of running at 80-90 amps constantor 1800-1900 wattsin the air for 5 mins, so with the heatsinking properties of the fan housing and a heatsink I think you should be able to run it for hours at 45A.

Its the only option I know of that will give you the headroom, if you run it at 13v from a regular 13.8v switchmode power supply you will be down under 40A and even safer. What sort of air volume do you need from the fan? You can email me <span style="color: #0000ff">HERE</span>if you dont want to talk about the application on open forum.