4' Long Linear Air Diverters. In some commercial buildings, the HVAC systems blow air so forcefully that the excessive hot or cold air can cause a reduction in work performance and employee morale. Linear diffusers are specially-designed to solve that problem. These products divert unwanted, constantly blowing air away from populated areas with a 45-degree or 90-degree deflection so the air is distributed more evenly through the space. The result is a more seamless indoor environment that's more comfortable and pleasant.