Welcome to the forum. Although you can post in any forum, the USA forum is here in case of local regs or laws
Will the filters need replacing regularly?There are not as good. However a decent one with activated charcoal filters is pretty good at lessening smells - it’s the moisture that a vented one is far superior with.
Reply to the thread, titled "Unvented extractor fan for gas cooker" which is posted in Gas Engineers Forum on Plumbers Forums.
We recommend City Plumbing Supplies, BES, and Plumbing Superstore for all plumbing supplies.