240 heater fan

Just replaced heater fan. Got one from a scrap yard, after getting old
heater unit out, split the casing and installed good fan.
Problem was as we have seen before the bottom bearing had seized due to crud
gathering around it, causing motor brushes to overheat and melt there
mountings.
I siliconed a tube in place, the kind you get on screen wash systems, the
end is aimed at the bearing, led it through casing, (siliconed both sides of
hole so it is held fast), and terminated in glove box, in future I will give
it a blast of WD40, (using the wee red tube taped on the tin), and this
should clear any crud and lubricate the bearing, hopefully prolonging the
life.
I feel that WD40 performs better than oil as it does not create a puddle
that attracts crud. And the aerosol action forces crud out.
The other mod. made was I siliconed a piece of stainless steel mesh in the
top of the air intake to try and reduce the amount of crud coming in as
there was a lot of dead leaves in both units, leaves give of a corrosive
when wet, so I hope this helps others and stops me having to skin my
knuckles again on this task.