The problem with conventional air registers "It's too hot" - "too cold" are the top two complaints facility managers hear according to an IFMA (International Facility Management Association) Survey. The Solution: Softaire Diffusers solve the problem at the source — those ceiling outlets. Softaire Diffusers are very quiet. Sound pressure levels (SPL) never exceed ambient background SPL up through flow rates of 1,000 FPM. At 1,000 FPM the NC value of Softaire was 22. At 1,500 FPM the NC value was 33. These values are consistently quieter than the competitor's diffuser tested, which had NC values ranging from 23 at 600 FPM to 44 at 1,500 FPM. (Listings created by https://www.facebook.com/GetFoundOnGoogle)