Stepped-louvre heating, ventilating and air conditioning unit used in high volume, low-speed fan

摘要

A manifold including a stepped louvre to control airflow along a fan blade. A fan blade for use in a high volume, low-speed fan, wherein the fan blade includes a body portion, a leading edge portion and a trailing portion. The leading edge portion of the fan blade includes a series of steps extending along the length of the leading edge. The fan distributes airflow from the manifold.