Ventless or Vented range hoods - sometimes you have no option

A ventless hood is the last resort if you cannot find a way to get the fumes from cooking on the range to the outside. While such a hood will trap grease and will kill odors (while the charcoal in the filter is still active - very important - charcoal filters have a limited lifespan) it will not reduce the condensation and smoke caused by cooking. This is especially a problem if you cook with gas that generates a lot of condensation. Depending on how much you cook you may need to replace the carbon filters every 2 - 6 months to deal with the cooking smells.

While it may cost a little extra, over the years you will benefit enormously from a properly vented range hood - you will also save money by not having replace the carbon filters. http://www.customrangehoods.ca/