A VAV system, as shown in Figure 10, controls temperature in a space by varying the quantity of supply air rather than varying the supply…

While maintaining constant airflow, single-duct constant volume systems change the supply air temperature in response to the space load (Figure 9). Single-Zone Systems. The simplest…

Vibration and sound isolation equipment is required for most central fan installations. Standard mountings of fiberglass, ribbed rubber, neoprene mounts, and springs are available for…

common complaint regarding buildings is the lack of outside air. This problem is especially a concern in VAV systems where outside air quantities are established…

Either axial flow, centrifugal, or plug fans may be chosen as supply air fans for straight-through flow applications. In factory-fabricated units, more than one centrifugal…

Humidifiers may be installed as part of the central station airhandling unit, or in terminals at the point of use, or both. Where close humidity…

Reheat systems are strongly discouraged, unless recovered energy is used (see ASHRAE Standard 90.1). Reheating is limited to laboratory, health care, or similar applications where…

In this section, sensible and latent heat are removed from the air. In all finned coils, some air passes through without contacting the fins or…

The preheat coil should have wide fin spacing, be accessible for easy cleaning, and be protected by filters. If the preheat coil is located in…

If the equipment is closely coupled to outdoor louvers in a wall, the minimum outdoor air damper should be located as close as possible to…