tHANKS FOR THE INFO i GUESS IT BELONGS TO THE GAS HEATER AVAILABLE ONLY ON cANADIAN MODELS. hOWEVER i STLL DO NOT KNOW IF i CAN COVER IT UP? tH E GAS HEATER WILL BE COMPLETELY REMOVED.  I already removed the back seat blower. and back seat. This vent was behind a black metal housing with foam in it.