The NEBB Professional 2026 - Quarter 3

Composite diffusers move air more smoothly, with no movable or metal parts, helping reduce turbulence that causes diffuser noise and eliminating the persistent ticking found with metal diffusers. The result is a quiet er delivery system that supports the acoustic environ ment rather than working against it. In spaces where FMs have already invested in acoustic treatments, that distinction matters. A diffuser that adds noise at the ceiling level can quietly undermine those investments. For FM who view the workplace as a whole, diffuser selection is a practical way to close the loop. Acoustics should not be addressed only through finishes and fur niture if the air delivery system is still contributing un wanted noise. Diffuser selection has historically been treated as a late-stage, low-priority line item, chosen for price or availability rather than performance. That approach leaves measurable value on the table. Diffusers touch air distribution, acoustic comfort, condensation risk, health hazards and long-term maintenance burden simultaneously. They deserve to be specified with the same care applied to other building performance components. A diffuser’s first job is simple, but critical: moving air evenly through the space. Not every product performs the same way in every environment. Open offices, private offices, meeting rooms, corridors and collab oration areas all have different needs. A diffuser that works well in one area may not be the right fit for another. In open-plan offices, uneven air distribution can cre ate microclimates across the same floor. One group of employees may feel cold, while another area feels stagnant. The thermostat often becomes the first thing people blame, but adjusting the temperature does not always solve the underlying issue. In some cases, it simply moves the discomfort somewhere else. Condensation and moisture risk are underweighted until they become visible. In humid climates or heavi ly air-conditioned spaces, metal diffusers are prone to Reframing diffuser specification as a performance decision

and support occupant focus. What often goes unex amined is how the HVAC delivery system, specifically the diffuser, can contribute to the very noise problem those investment decisions are trying to solve. Metal diffusers can generate turbulence-driven noise and whistling and can also cause annoying popping or clicking noises as metal hardware in the diffuser expands and contracts, which adds a persistent layer to the office soundscape. In open-plan environments with hard surfaces and limited absorption, that noise compounds. Occupants may not identify the source, but they feel the cumulative effect — a subtle yet con stant friction that makes concentration and comfort hard.

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The NEBB Professional | Quarter 3 | 2026