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Cleanroom Air Distribution Systems
Single-Duct VAV Reheat Terminal Unit
A pressure-independent single-duct terminal that meters primary air and reheats the minimum airflow before discharge to a perimeter or process-support zone.
- Pressure-Independent VAV Control
- Integral Hot-Water or Electric Reheat
- Averaging Inlet Flow Sensor
- Acoustically Lined Casing
Product Introduction
The single-duct VAV reheat terminal unit combines a round primary-air inlet, averaging flow sensor, modulating damper and rectangular discharge casing with an integral heating section. During cooling demand, the controller varies primary airflow between programmed minimum and maximum values. When the zone requires heat, airflow is held at the heating minimum while a hot-water valve or staged electric heater raises the discharge temperature. An acoustic liner and optional attenuator control regenerated noise, while coil access panels support inspection of the downstream heating section.
Key Features
Hot-water or electric reheat adds sensible heat downstream of the control damper without a terminal fan.
Programmed cooling, ventilation and heating minimums allow airflow to follow the zone operating sequence.
Acoustic lining and optional discharge attenuator reduce radiated and air-path noise above occupied spaces.
Customer Product Concerns
A reheat terminal must preserve required ventilation airflow, prevent discharge overheating, control noise and keep the heating coil and controller accessible above the ceiling.
Reducing cooling airflow below the ventilation minimum compromises room air exchange.Separate programmed cooling and occupied minimums keep primary air above the required ventilation quantity.
Reheat energizes at too little airflow and produces excessive discharge temperature.Airflow proof and a defined heating minimum enable the coil or heater only when sufficient air passes through the box.
High inlet static pressure produces objectionable regenerated noise over the room.Correct inlet sizing, duct-pressure reset and acoustic attenuation limit velocity and throttling sound.
A leaking water coil valve causes simultaneous cooling and heating energy waste.A tight-closing modulating valve and discharge-air temperature monitoring expose unintended heat input.
Typical Applications
Cleanroom perimeter support zonesLaboratory offices and write-up roomsHospital patient and support spacesPharmaceutical corridors and gowning roomsCommercial zones with central cool air
Technical Parameters
Representative casing construction ranges for a single-duct VAV terminal with integral reheat are shown below.
| Core Material | 32–48 kg/m³ mineral-fiber acoustic liner behind galvanized casing with copper-tube aluminum-fin reheat coil |
|---|---|
| Panel Thickness | 13–25 mm internal acoustic liner |
| Effective Width | 300–1000 mm nominal terminal casing width |
| Maximum Length | Up to 1800 mm combined terminal, attenuator and reheat-section length |
| Steel Facing Thickness | 0.7–1.0 mm galvanized casing and access panels |
| Core Density | 32–48 kg/m³ mineral-fiber acoustic lining |
| Thermal Conductivity | Approximately 0.035–0.045 W/(m·K) for the acoustic liner |
| Surface Finish | Mill-galvanized casing with cleanable liner facing and corrosion-protected coil frame |
| Joint Type | Round inlet to rectangular lined casing with integral sensor, damper and flanged downstream reheat section |
| Customization | Available based on the intended application and operating environment. |
Available Options
One- to four-row hot-water reheat coilStaged or proportional electric heaterIntegral discharge attenuatorFactory-mounted DDC controller and valve package
Planning a Single-Duct VAV Reheat Terminal Unit specification?
Send us your dimensions, installation conditions, performance targets and required surface finish.
