How do I know if my HVAC system has return vents?

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You can identify return vents by turning on the system fan and holding your hand or a piece of paper up. If the paper is pulled toward the vent or you feel a suction effect, it’s a return vent. Never Block Supply or Return Vents! When your heating or cooling system is on, it’s not just blowing conditioned air — it’s simultaneously sucking air out.

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