I received my starter kit today. I am running it now (about 41 GH/s) without any fan and the ambient temperature is 24C. Do I have to be concerned or running without any fans with a kit with just 2 H-boards is not a problem?
Not a problem with the core voltage that is on your boards. Our chip has been proven to hash even at such extreme temperatures that the solder melted 
Then it started floating and shorted itself, ending hashing Some of our users are actually reporting decreased hashrates after adding fans. YMMV.