The GeForce GTX 1070 Ti founders edition is 10.5 inches in length (cooler inclusive) which is roughly 27 cm so it should fit comfortably in pretty much any decent chassis. The cooler that GTX 1070 Ti uses handles for a < 250W design graphics card, similar to its bigger brother 1080.
The cooler is impressive in both performance but also size, that's ~11 inches of graphics card right there. Please always do make sure the card physically fits inside your chassis.
This cooler is combined with a large, dual-slot aluminum heatsink to dissipate heat of the chip. A blower style fan then exhausts this hot air through the back of the graphics card and is exhausted at the exit to the left.
A five-phase power supply is responsible for supplying the GP104-300 GPU with power. An additional power phase is dedicated to the board’s GDDR5 memory. As you can see, the bottom of the cooler functions of a front-side plate drawing heat from essential components.
Overall, this is the traditional Nvidia design really. Easy to recognize. Not the most silent though, but we'll check that our in our test runs of course.