I have an furnace electrostatic air filter.
It is just a filter about one inch thick and replaces the standard old
fashioned air filter.
It was cut to size and the frame was trimmed and screwed together.
The frame and grate on both sides is black.

A white and blue label with an air flow arrow and white lettering on the
side says:

Electrostatic
AirCleaner.

The l in Electrostatic is a lightning bolt.

Under the arrow it says in very fine print:

Electrostatic AIR FLOW INDICATOR

Can someone identify the manufacturer.
I have blown it out but wonder if I can wash it.

I Googled but so far no success.

TIA