Brilliantly simple solution for fast and exact measurement, balance and control of airflow.
They are ideal for supply and exhaust tracking control, individual comfort control, and any space requiring accurate airflow regulation.
Applications for IRIS dampers include office buildings, pharmaceuticals, clean room environments, and laboratories. Its unique design allows for airflow to be measured and controlled at a single station, thus saving time and money in initial installation and commissioning, and those applications requiring air balance on a regular basis.
IRIS dampers are comprised of a casing, damper blades, an adjustment or regulating nut, and airflow adjustment chart, and airflow taps. Blades and casing are manufactured from galvanized steel or 316 stainless steel (IRIS-S). The remaining components are made from high strength plastics and rubber.
Features & Benefits:
- Precise airflow measurement
- Accurate air balancing to +/- 5% in a straight duct
- Single station measurement and control
- Reduced field labor time
- Hot dipped galvanized steel construction
- Fitted EPDM gasket for airtight mounting
- Compact design, superior performance
- Fully retractable blades for duct cleaning
- Max operating temperature:
- 180°F continuous
- 250°F intermittent
- Iris-06 Size 6″
- Contact factory for price & availability on IRIS-S Stainless Steel Damper models IRIS-S-04, -05, -06, -08, -10, -12, -16, -20, -25, -32
- Capacities: 15 cfm to 20,000 cfm
Airflow Control and Balance
Once an IRIS damper has been installed and the system is operational, the damper may be adjusted to deliver required airflow using the airflow adjustment chart located on the damper.
Each IRIS damper contains two airflow taps (pressure ports) and an Airflow Adjustment Chart. By connecting a pressure gauge to the taps of the damper, the pressure drop across the damper blades can be measured. The illustration (Figure 2) shows the setup for making a pressure measurement.
Each damper setting has a unique ‘k’ factor that defines the curves at different damper settings. The air velocity flowing through the orifice of the damper is proportional to the measured pressure drop. Once the velocity is known, the airflow can be easily calculated when the cross-sectional area of the orifice is known. The relationship between pressure drop and airflow through an IRIS damper is
q = K√Δpm
q = airflow (cfm)
Δpm = measured pressure drop (in. w.g.)
k = constant of proportionality (dependent upon orifice area)
For initial airflow balance, note the damper position and related pressure drop. Refer to the Airflow Adjustment Charts to determine the airflow.
