Product review (4 stars): What can I say, it's your only choice
I purchased a new Broan vent hood for my kitchen, I don't have ductwork to vent outside. If you purchase a Broan QP series vent hood and do not have outside venting ductwork, then your only choice is to purchase the cleansense charcoal filters. They do OK I guess (better then nothing but outside venting is what really works).