The NEBB Professional 2026 - Quarter 3

Understanding this dynamic is the first step. The sec ond? Recognizing where the system most commonly falls short, not at the unit or the ductwork level, but at the point of delivery itself. How diffuser selection directly impacts occupant comfort & air distribution Specification discussions around HVAC tend to focus on the big-ticket components— equipment selection, filtration standards, and ductwork design. These mat ter, but they do not tell the whole story. The diffuser is the final step in the air delivery process, and it has a direct impact on how conditioned air moves through the occupied space. When a diffuser is not well-suited to the environment, the effects are easy to feel. One area may be stuffy and stagnant, while another feels cold or drafty. A conference room may become uncomfortable halfway through a meeting. Open office areas may develop hot and cold spots that lead to recurring complaints. Occupants rarely identify the diffuser as the source, but they know when a space does not feel right.

Material selection can help solve the issue. Traditional metal diffusers conduct heat and are susceptible to condensation in humid or heavily air-conditioned envi ronments, creating a maintenance liability that signals a deeper performance gap. Over time, moisture can also contribute to avoidable health and maintenance concerns, from mold risk to rust on metal compo nents. Composite diffuser alternatives distribute air more evenly, reduce condensation by up to 95 per cent, and reduce the long-term maintenance burden that FM teams are often left quietly managing in the background. Material selection affects more than air distribution and maintenance; it also has a direct bear ing on another occupant experience factor that rarely comes up in diffuser conversations: noise. Acoustics: The specification for diffusers most FMs miss Acoustic performance is an established FM priority, especially in workplace design. FMs invest meaning fully in ceiling and wall panels, partitions, flooring ma terials and treatments to manage sound transmission

READ, QUIZ, EARN! After reading the full issue, please go to the NEBB Learning Center at https://nlc.nebb.org to take a 5-question quiz to earn 0.25 NEBB CEC!

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The NEBB Professional | Quarter 3 | 2026