Although our Ancona wall mounted range hoods are made for 9ft ceilings, you can install our chimney style range hoods on an 8ft ceiling. Please consult the dimension sheet of the model you are interested in prior to purchasing the unit in order to confirm that the sizes are compliant. If you have enough space, you can install it using just the upper chimney. If both chimneys are needed for installation, one of the chimneys can be cut by a professional metal shop in order to fit your space accordingly.