Voracek got loose during a sustained Columbus offensive thrust in the first period and skated to the top of the slot, where he unleashed a wrist shot that found the net.
Boll then made it 2-0 in the second, scoring off a scramble in front of Henrik Karlsson.
Rostislav Klesla added an empty-netter and Garon made 29 saves to help Columbus break a four-game losing skid.
The Flames got their only goal from Olli Jokinen and Karlsson turned away 34-of-37 shots in Calgary's third straight loss.
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