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My husband, Peter, has made three air filters which were first described
to us by Chris of Cams Birds and they are working extremely well in
The Birdroom.
Beg, borrow or buy a 6" desk fan (20 watts). Remove the foot stand
from the fan and safety cage. The diameter of the safety cage was 8".
Make a size 8" internal box, 12" long out of scrap wood, but with open
ends. Cut a 4" strip of strong cardboard (or thin metal) 26.5" long
as a bezel. Wrap the cardboard bezel tightly around the safety cage
and mark the outside overlap with pencil (a dotted line)
Remove safety cage and re-mark the dotted line: with a sloping line,
as in the diagram below. Complete the bezel by gluing the 1.5" piece
to the right of the sloping line. Bring the other end of the strip to
lie on the sloping line and press to fix. When dry, place fan unit into
bezel and then put fan and bezel into "wind tunnel".
Stuff each of the four corners between the bezel and the wind tunnel
with newspaper and press firmly from both sides. The fan is now securely
mounted and there is only a one-way flow of air.
Cut a 12" square of interlining (from a textile shop (buying two metres
for spares) and place it over the intake end of the tunnel, fastening
with a large elastic band to hold it into position.
Once a day, switch off fan and clean filter with vacuum cleaner set
at reduced suction.
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