When the negative-electrostatic charged odor-essential particles remain in the same environment for a certain period of time with a foul odor, it traps around the particles that take charge (+) in the electrostatic filter, thus emitting a nice and pleasant odor. Especially the removal of the smell in the restaurants under the apartment is a big problem. Although the active carbon filter lasts 6 months or 12 months, it does not hold the smell anywhere more than 30 days. In addition, activated carbon does not give any benefit in urban enterprises that cook meat of 25 kg or more per day. The only and definitive solution is (-) ionized odor neutralization.