Look at fan.... Seriously, fans usually have one inlet and one outlet..... BUT some fans actually have two inlets.....Its all about the design of fan.... It could be the type of fan you have can actually draw air from motor side too and you do not realize it.... If so this type of fan needs to be in a box or plenum with exhaust plumbed to outside of box and beyond and intake to the box so it can feed both intakes (suction sides) of fan....
As opposed to this type of fan that only has single inlet which does not need to be inside a box but merely has ducting connected to inlet and outlet...
Dale
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Vendor-Artist-Studio-Teacher Registry
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San Francisco - A Few Toys Short of a Happy Meal