Nodegrid Services Router and Nodegrid Serial Console ( S series ) have air exhaust or 

air intake fans ( swappable, front-to-back or back-to-front) to cool down the device. 

Fans will be at the back side (back panel).

The fan is not hot swappable. The devices must be power off before servicing or swapping.

Online insertion and removal is not possible.

Nodegrid Services Router has different expansion cards depends on the requirements.

Expansion cards are also not hot swappable. So device must be power off while swapping.