Blower blade assembly having counterbalancers

A blower blade assembly which comprises:

• a plurality of fan blades arranged in a circular row, each of said fan blades having first and second major surfaces opposite to each other;
• and
• a respective one-piece counterbalancer mounted firmly on at least one of the fan blades, said one-piece counterbalancer contacting said major surfaces of said one of the fan blades only along three lines of contact,
• said counterbalancer including a first arm contacting the first surface of the fan blade along only two of said lines of contact, a second arm contacting the second surface of the fan blade along only a third one of said lines contact, the third line of contact being located intermediate said two lines of contact with respect to a direction extending along said one of the fan blades between leading and trailing edges thereof, and an elastic connecting bridge connecting the first and second arms together, said elastic connecting bridge urging said first and said second arms toward one another in opposite directions, respectively, such that said one of the fan blades is clamped by said first and said second arms by forces exerted thereon by said counterbalancer only at three locations corresponding to said three lines of contact.