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Hi Ken. I'll give it a go, but I'm operating under the disadvantage of not having read the thread - been busy and out under clear skies Sat night - woopee!
1.15m at 13.77 ohms per metre = 15.8 ohm. Connect 13.5 volts to that resistance and the current flow will be 0.85A. Two of these in parallel will draw 1.7A. Add the fan at about 0.2 amp and you reach 1.9A. Nope, I don't think your supply will be capable. Try one length only on the supply - no fan as well, and see what temperature above ambient you reach? Just to try and get a feel for the performance. If you can use twice the length of wire for each heater then maybe you can run them both plus the fan - your supply will be at its limit and will probably drop a bit in voltage output - unless very well regulated.
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