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Oct 16, 2020 · Most range hoods are 400-695 CFM's for a standard gas range. The microwave was an adequate vent for a typical stove designed in the 1980s and 1990s. However, while the over-the-range microwave specifications haven't changed, gas ranges have increased output considerably. The average gas range had a power burner of 12,000 BTU back in 1988.