Two NF-A15 fans measuring 140x150x25mm are mounted unidirectional on the NH-D15 heatsink. Both PWM fans spin at 1500RPM and use 4-pin fan headers (one via splitter, or two if you have a gamers motherboard). Looking at the top of the Noctua NH-D15 heatsink we see two separate towers measuring 150x50mm in size (10mm wider than the previous NH-D14 cooler). Each tower each stands 104mm tall. The six heatpipes are evenly spaced through the 2mm spaced nickel plated aluminum fins and all intersections are soldered to reduce thermal joint resistance. Fin edges have multiple 14mm saw-toothed profiles.

The Noctua NH-D15 heatsink stands 162mm tall; the bottom most aluminum fin is elevated 48mm over the CPU, the second-lowest fin is elevated 64mm. If you're measuring for clearances, the heatsink is 95mm wide where the fins are notched, 135mm wide after the fins go to full width (assuming the outside fan is removed). Heatpipes expand from side-by-side at the heatspreader base to a ~16mm spacing as they pass through the aluminum fins. Each nickel plated aluminum fin measures 0.4mm thick and is spaced 2.0mm from the next. Note the wire fan clips used to secure the two fans to the NH-D15's fin stacks.

The base of Noctua's NH-D15 heatsink measures 40x38mm in size. The copper base plate is 2-to-4.5mm thick. The six 6mm diameter copper heatpipes are soldered to the copper base plate and aluminum base cap.