Hello to this forum,

For a house need totally unrelated to aviation I'm in a search
for a VERY powerful fan. After searching for what's avaliable
on the general market (either huge or weak blowers) my mind
wondered "outside the box" (or, rather, above the ground) and I
remembered the RC models engines. After some "googling"
(and checking what's avaliable on ebay) I'm considering to use
the "Lander" 64mm EDF+motor. It looks both powerful and compact.
But the main obstable I see to using this component is: as opposed
to few minutes of operation during a flight, my intended use for it will be
firmly on the ground and for many hours in a row for few days (instead
of batteries I'll have to get 12V 60A power supply). Which brings the main
question: how capable is the EDF+motor combination of a prolonged
operation? From looking at the specs I saw that the max. power is limited
to about 10 Sec and slightly lower power is limited to 1 min. Is there
any table/graph/rule of thumb by which I can calculate at what fraction
of the max power can the EDF be safely operated for a VERY long time?

What are its limiting factors:

1) Bearings wear?
2) Ablation of rotor blades surface causing it to become un balanced?
3) Some other pards deform over time?

Another type of considerations are thermal limits: since I saw EDFs
sometimes mounted inside the fuselage, that means the air flow
of the fan is sufficient to cool the fan+motor, am I correct in this
respect? How about the ESC: does it requires active cooling (that is, must be
mounted to have the airflow over it)?

Thanks in advance for any info,
kaza.

P.S.: I'm aware of the noise problem, it'll be solved.