Overview

American Aldes MR Modulo Adjustable Constant Airflow Regulators are modulating orifices that automatically regulate airflows in duct systems to constant levels. The passive control element responds to duct pressure and requires no electric or pneumatic sensors or controls. The MR Modulo compensates for changes in duct pressure caused by thermal stack effect, building pressure, dust-clogged filters, etc. The MR Modulo also provides a low-cost solution to balancing forced-air systems for heating, air conditioning and ventilation, eliminating the need for on-site balancing.

The MR Modulo is constructed of PC / ABS plastic, and it is UL 2043 safety classified and labeled for flame and smoke generation. The assembly is sized to fit inside standard rigid round ducting, as well as fittings such as take-offs, tees, etc. A double-lip airtightness seal around the circumference ensures a tight, no-leak fit.

The active control element is a flexible bulb that inflates and deflates in response to the static pressure difference across the control. This operation regulates the free-area opening through the control, resulting in maintenance of velocity and specific airflow set points. Each diameter of MR Modulo is available in multiple factory-calibrated set points. Field adjustment is achieved by twisting the integral rotating ring to the desired set point. No tools are required.

Pressure Range: 0.2 to 1.0 in. w.g. (50-250 Pa)
Available Diameters:  3″, 4″, 5″, 6″, 8″, 10″
Airflow Range: 10-385 CFM
Use: Exhaust or Supply Air
Application: New Construction or Retrofit
Duct Type: Round

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