Mechanical vents (exhaust fans) having a flow rating of 2 ft3/min (0.19 m3/min) for every 1000 Btu/hr (1000 W) rated input of the appliance shall be permitted to be located on an adjacent wall higher than the appliance within a horizontal distance of not more than 5 ft (1.5 m) from the nearest edge of the appliance.
(The most common range w/ oven is rated @ 29, 100 BTU/hr)