>>4523918The amount of air moved by the fan per unit time depends more heavily on the blade pitch than how many blades there are on the fan blade itself. This is why thin and soft plastic blades move little air while creating excessive noise. In contrast, thicker fan blades made with harder plastics and metallic fan blades usually move more air due to the pitch of their blades. Additionally, thicker plastic fan blades usually provide silent operation which is optimal for use in homes and confined but ventilated spaces. For outdoor and industrial usage where noise is less of a concern, metallic blades will be suitable as they move the most amount of air, providing ventilation to larger areas.
Fortunately, thin and soft plastic fan blades are only found in fans with subpar quality, which are commonly the cheapest ones found in supermarkets. Hence, it is a good practice to avoid them and go for a reputable brand instead. Not only is the fan blade thicker in these models, they are more durable as well.
