CAR3 Constant Airflow Regulators


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SKU: CAR3 Category:


The new dual adjustable* model CAR3 Constant Airflow Regulator is a modulating orifice that automatically regulates airflows in duct systems to constant levels. The passive control element responds to duct pressure and requires no sensors or controls.

The CAR3 compensates for changes in duct pressure caused by: use of demand control solutions, thermal stack effect, and dust-clogged filters. The CAR3 provides a low-cost solution to balancing forced-air systems for ventilation, heating, and air conditioning, eliminating the need for on-site balancing. The CAR3 will regulate airflow in supply, return, or exhaust duct systems. The CAR3 is designed to complement ALDES register assemblies or fit inside standard rigid round ducting, as well as fittings such as take-offs, tees, etc., with a double lip gasket around the circumference, ensuring a tight, no-leak fit.

The active control element of the CAR3 is an engineered damper assembly that is calibrated to respond to changes in pressure with no input from an external power source or signal. The CAR3 is UL 2043 safety classified and labeled for flame and smoke generation.

The CAR3 airflow regulators control airflow accurately to within 10% of rated flow throughout the target operating pressure ranges; 0.12 to 1.2 in. w.g. (30 to 300 Pa) for low-pressure models (CAR3-L), and 0.4 to 2.8 in. w.g. (100 to 650 Pa) for high-pressure models (CAR3-H). The airflow set point is selected by turning the adjustment dial on either side (supply or exhaust) of the CAR3. The indicator shows the selected CFM. Each diameter of CAR3 has a unique airflow range for both low- and high-pressure variants, and the setpoint is infinitely adjustable across those ranges.

UL Classified: CAR3 is UL 2043 safety classified and labeled for flame and smoke generation (File No. R39897)
Pressure Ranges: CAR3-L: 0.12 to 1.2 in. w.g. or CAR3-H: 0.4 to 2.8 in. w.g.

Construction: CAR3 is enhanced with antimicrobial, anti-static, and flame retardant additives

Use: Exhaust or Supply Air
Application: New Construction or Retrofit
Warranty: 7 years
Duct Type: Round
*Patent Pending



Pressure Range

High-Pressure, Low-Pressure


H10: 170-900 CFM, H4: 30-160 CFM, H5: 55-260 CFM, H6: 60-370 CFM, H8: 130-630 CFM, L10: 110-620 CFM, L4: 15-85 CFM, L5: 35-180 CFM, L6: 45-260 CFM, L8: 70-385 CFM


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CAR3 Data Sheet

CAR3 Install Manual

CAR3 Brochure