charcoal briquettes, no
but an all natural, chunk charcoal could be used in a pinch if necessary, but never briquetts, wood does not naturally make a briquette shape when burnt, so it has be reshaped with chemical adhesives and would not recomend involving it in anything that will be ingested, including the air supply of a room.

activated charcoal isnt terribly expensive, some garden supply centers have it, and fish stores obviously, also home water purifiers use activated charcoal so there are some sources.
jimmy8778 Reviewed by jimmy8778 on . BBQ charcoal. Hey, I need to make a carbon filter for my grow and I have lots of BBQ charcoal briquettes. If I were to crush them, does anyone know if this would this work in an air filter? Ta. Rating: 5