Thermalright introduced the TL-B12015 line of slimline case fans, the TL-B12015, and the TL-B12015 Extrem. These 120 mm fans come with thickness of 15 mm, but a design effort is made by Thermalright to shore up airflow comparable to regular 25 mm-thick fans. This is done by giving the impeller a 15-blade design compared to most 25 mm fans that come with 9 blades. The impellers are also webbed along the edges to maximize axial airflow. The two variants differ with performance specs.

The TL-B12015 turns at speeds of up to 2,150 RPM, pushing up to 57.8 CFM of airflow and a static pressure of 1.8 mm H₂O, and a maximum noise level of a respectable 25.37 dBA. The TL-B12015 Extrem, on the other hand, has a much higher maximum speed, going up to 3,150 RPM, for maximum airflow of 83.61 CFM, 3.4 mm H₂O static pressure, and maximum noise of 37.07 dBA. Both fans come with a dual ball-bearing design, and include a metal fan grille to protect your fingers from its turbine-like 15-blade impeller turning at high speeds. The TL-B12015 Extrem comes with an RGB-illuminated ring around the bore of the frame, while the TL-B12015 comes with a white illuminated ring. The company didn't reveal pricing.