The area of the triangles are small but they do allow air to be forced into the Frunk area. Right side might help in giving a more accurate temp reading once you are moving because the air/pressure sensor is still located here. First picture is the back of the right side.
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This picture is the back of the left side tunnel. Notice the upper right of the tunnel is blocking the air flow as compared to the right side. The reason for this is the air intake tube takes a suction in this area.
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Last picture is the tunnel removed. If you look at the backside of the air intake tub you will see where the air is being sucked into the tube. It is not being forced in from the front as one might believe. So when sitting still and the fan comes on in reverse the air being sucked into the engine will be hot air.
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