For millions of people , the sight of a UPS truck brings as much excitement as anice cream hand truck . Driversin theirbasic brownattire are normally carry something you postulate ( or want ) from Amazon or other chain mail - order service .
But the truck have some interesting quirks . For one , driversdon’t care to turn leftin them . ( The company discourages left turns because it start against the stream of dealings , squander clip and fuel . ) Many of them also frequently sport a peculiar spinning twist on the roof .
That strange contrivance is called aFlettner ventilator , and its purpose is simple-minded : It ’s meant to keep air circulating inside a fomite . UPS trucks — which the company touch to aspackage motorcar — can’t really operate gentle wind conditioning efficiently because the doors are left open so driver can quickly move in and out .
Having the Flettner ventilator installed to pass around aura keeps the cabin and package area from becoming too red-hot , specially during the summertime months . The ventilators are breaking wind - power , so when the fomite is in motion — or on a particularly impractical day — it’ll twisting and move air . Flettner claims the fan canreducethe internal temperature of the truck by as much as 10 to 15 grade . Flettner ventilators are n’t undivided to UPS hand truck ; you’re able to oftenspot themon Amazon rescue vehicles and other freight truck .
If you woolgather of one day owning a UPS package car that ’s been adjourn , Flettner ventilator and all , you ’re plausibly out of luck . The troupe does n’t leave for theresaleof vehicles in their fleet . Old mannequin are either retired to lighter work in internal service or scrapped .
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