Does Macbook have a Right Fan?

Very excited to get my first Mac, its very ... shiny~. I noticed its always running at about 45 to 50 degrees celsius, so i got this Fan control program to boost the rpm of the fan. I noticed that the left fan rpm is changing as i change the settings, but the right fan rpm is always -1. Does MacBooks have a right fan? Should i be worried that the right fan rpm reading is -1?

As FM mentioned, there is only one fan in the MacBook. The MacBook Pro has two fans... which is why they show both in the app.

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