I went round the house with a ruler, and attempted to make a list of things
that were the right diameter to make into ducts.
Straight ducts
40mm
Toilet roll inner
50mm
Lynx can (Ed: Pressurised container - not recommended)
60mm
Beer can
80mm
Canned fruit tin
92mm
500g Cadburys drinking chocolate tin
92mm
2 litre coke bottle
120mm
3 litre coke bottle
Reducing ducts
60-50mm
“Shape” trifle pot
80-60mm
Mullerice pot
92-60mm
2 litre coke bottle
120-80mm
3 litre coke bottle
Another idea that I thought of was to use a cheap plastic funnel, they come
in all sizes, and can be cut to size easily. They are also sturdy, and fairly
aesthetically pleasing if you get one in clear plastic.
Conclusion
Large improvements in the effectiveness of fans can be seen through the use
of well placed ducts. Be inventive, see what you can find around the house and
you may be surprised by the results you can achieve.
