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No, range hoods do not necessarily have to be vented outside. Ductless or non-vented range hoods are available, which are common in condos or small kitchens where connecting to external ductwork isn't feasible. These hoods operate by taking in air, filtering it through charcoal filters to help eliminate smoke and odors, and then recirculating the cleaned air back into the kitchen. However, while these recirculating hoods are more versatile, venting to the outside is still the preferred and more effective method for completely removing smoke, odors, and gases from the room.

Typically 1-2 hours, factoring in ductwork and electrical connections.

Most residential range hoods have a CFM between 200 and 600. A higher CFM means your range hood is better at removing smoke and odors from your kitchen. The measurement ultimately depends on your stove’s width and heat output as well as the size of your kitchen. 

Compared to the average size of a stove and kitchen, 350 CFM would be the minimum recommended rating for the average kitchen. However, selecting a higher CFM range hood would guarantee better ventilation to match your cooking habits, whether they’re minimal or extensive.

A higher CFM will make the price of your range hood more expensive. It can be challenging to speculate how much the CFM rating affects price, but ductless range hoods—that don’t need as high of a CFM as ducted range hoods—are less expensive than their alternative. On average, ductless hoods cost between $100 and $300, while ducted hoods can cost as much as $1,000.