On Mon, 19 Feb 2018 14:03:37 -0800 (PST), wrote:

The Envy has such a high air through-put that it doesn't take long to injest
enough dust to start causing problems.

get a piece of foam and make an external intake filter
much easier to clean an external filter
m

Won't work. The basic problem is that the typical laptop fan air
intake is on the bottom of the laptop, where it can play vacuum
cleaner and suck all the dust, hair, and food debris from the table
and into the fan. The fan then uses centrifugal force to launch all
this crud into the heat pipe fins, where they get stuck. Plugging the
intake with a filter might prevent clogging the downstream fins, but
just moves the problem to the intake filter, which can also become
clogged. Granted, an intake filter is easier to clean, but from
experience, nobody ever cleans the filters until they are totally
clogged.

A better solution would be to find a more protected air intake
location, such as on the top of the machine. That could be done with
a plenum or duct, but with todays ultra-thin laptops, there's no room.
Worse, most of the top is obstructed by the keyboard. There are a few
laptops that have the air intake on the side, and exhaust out the
back. Those don't clog as easily, but do tend to have larger cases.



--
Jeff Liebermann
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558