If you must move the air through a smaller diameter tube, because of dimensional constraints, then try to keep the tube as short as possible, or at least keep the bottleneck short. For example, if you must move the air a total of 200cm, but the constraint is only 50cm, then use a larger diameter tube of the remaining 150cm.
And keep the tube smooth, without any sharp bends.
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Ecorenovation - the bottomless piggy bank that tries to tame the energy hog.
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