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Mechanical penetrations (Supply or Return Air Vents) are not allowed in garages in residential construction under the International Residential Code.

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Some countries' Building Codes and/or Regulations may allow a garage to be heated by a normal water-heated radiator supplied by the house's furnace or hot water calorifier. (Calorifier = "boiler" in everyday language.)

To find out if it is allowed where your home is situated you must check the Building Codes and/or Regulations for your locality i.e. Town/State/Country or - better still, as you needed to ask this question here - ask a locally-licensed plumber or HVAC (Heating Ventilation and Air Conditioning) technician for advice.

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Yes you can, as long as you use a 1 way trap tha restricts the airflow only to the garage and not backwards. "International building codes" do not apply everywhere

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