ANSWERS: 2
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Are you cutting into the main "trunk line"?
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They carefully measure the size of the unit for the area its heating. also the distance on the duct will affect the amount of air pushed through the supply line. You could do it because the vents have adjustments to open them more or close them allowing more air to pass through. Although a space heater is always a cheap fast alternative with no risk of damaging heating system.
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