One device I used to keep the observation window clean
(from the inside) is to drill small holes around the periphery
of the window. This is largely where intake air comes from,
and it keeps the glass fairly clean during the use of fine blasting
media. Have built several cabinets using this method.
The size of the holes is experimental, based on the power
of the suction source.
Archie

Archie

For the sand blaster box wouldn't a layer of saran wrap over the inside of
the glass work? Very transparent and easy to renew.

Doug


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