thats from a 98 ex 5mt.... the only thing that could be a filter judging by that is the weird radiator thing... also called a heater core. i believe there is a foam thing over it to catch moisture. hmm... i just cant seem to find a cabin air filter for a 98 civic lol so i am concluding there isnt one.
the smell u cant do anything about. its going to happen, the filter will not purify the SMELL or get rid of the FUMES. its there to catch debri just like a normal air intake filter for your engine