Wouldn't it be pretty toxic (especially if it's a vapour?) In a sealed component in a datacentre that problem doesn't matter, but they're speculating about home use also.
Probably not, C-F bonds are extremely stable, so perfluoro compounds are biologically inert. The datasheet says they made some animal inhale 10% (!) Novec gas for 4 hours without effect.
It has half-life of 5 days in the atmosphere, so it's not that stable. According to the MSDS it and degrades both when exposed to UV and at high temperature (like those present in a structural fire) into hydrogen fluoride gas, which becomes hydrofluoric acid upon contact with moisture (including biological tissue).
Also you're supposed to dike the area if a major spill occurs, but I'm pretty sure that's just MSDS boilerplate.
The 3M leaflet suggests that you should avoid breathing it, or getting it on your skin or in your eyes, but that you shouldn't be harmed if you ingest it.
I don't know if that's relative to some of the other nastier stuff they sell.
The 3M page seems to show servers dunked in "semi sealed" cabinets of this stuff, which boils, evaporates, cools, and falls back into the tank.
http://multimedia.3m.com/mws/mediawebserver?mwsId=66666UF6EV...