Given: Two gas appliances are vented with a common vent. One has a 5″ vent connector and the other has a 3″ vent connector. The minimum size common vent required to vent these two appliances is ____.

Given: Two gas appliances are vented with a common vent. One has a 5″ vent connector and the other has a 3″ vent connector. The minimum size common vent required to vent these two appliances is ____.