On Aug 19, 3:41*pm, Heathcliff wrote:
I have a cheap Sears 3-gallon air compressor. *It has worked fine for
inflating tires.

I would like to rig up a tool for cleaning window screens by blowing
the dust off them with compressed air. *I am thinking in terms of a
wand a few feet long with a fan-shaped nozzle on the end. *(For
reasons too complicated to go into, I don't want to just use the hose
on the screens). *Just wondering if (a) something like that is already
available as a compressor attachment, or (b) would it be difficult to
fabricate something like that with items from the big box store (air
hose connector, PVC piping, etc.).

The volume of air your compressor supplies is probably in the
neighborhood of 2 - 3 cubic feet per minute (cfm). You would need
about 8 -10 cfm, the volume supplied by a 50 gal shop compressor.
Yours just won't handle what you propose.
KC