Those tiny slats won't do much. Thanks for the pic.These are the vents on each side of the house. They seem quite small to me. Working on a roof picture (need a new ladder)
I have a 8*12 shed. Originally I installed one 4 ft ridge vent in the middle of the roof. Shed has soffit vents on both sides of the gable roof. In summer when it was over 100 degress it was very hot inside when the door was closed. I decided to remove the one 4 foot and expand it to three 4 foot ridge vents for almost the entire length of the shed less 6 or so inches at each end of the roof peak. Temps in the summer dropped at least 10-15 degrees F.