Units are sized acording to sq ft needed to humidify. I have 1850 sq ft
with the april air without a fan and it does not work to capacity. Also
the tightness of a house is most critical, You may be fine without a fan
and the extra cost of runnibg a fan.
Talk to a competant installer, all houses are different, in
construction, tightness and the amount of humidity needed, determined by
location-low winter temps , the amount of people living there and style
of living.