CFR Series CAV Flow Regulator

Details

Constant air volume (CAV) regulator CFR automatically adjusts itself to maintain a predefined airflow rate. When the pressure increases or decreases the regulating mechanism reacts by opening or closing the throttle, thus maintaining a constant airflow.

The CFR series is designed for low pressure (0.2 to 0.8” SP), can be mounted in both horizontal and vertical duct lines, and be used at either the supply or exhaust side. The regulating mechanism includes a stainless steel spring and is made from class M1 (according to NFP 92-501) PVC plastic for use at temperatures up to 140˚F (60˚C). It is equipped with an EPDM gasket providing a tight connection between the regulator and a ventilation pipe wall. The regulator should be mounted in the distance equal at least 3 times its diameter from a supply valve and at least 1 diameter away from exhaust valve.

Specifications

Dimensions


MODEL	DESCRIPTION	NOMINAL DIAMETER (in)	CFM RANGE	A (in)	L (in)	WEIGHT (lbs)
CFR3-30*	3" Adjustable Constant Flow Regulator 10 to 30 CFM	3	10 to 30	3	1.85	0.16
CFR4-30	4" Adjustable Constant Flow Regulator 10 to 30 CFM	4	10 to 30	3.78	2.24	0.25
CFR4-60	4" Adjustable Constant Flow Regulator 30 to 60 CFM	4	30 to 60	3.78	2.24	0.25
CFR5-60	5" Adjustable Constant Flow Regulator 30 to 60 CFM	5	30 to 60	4.74	2.44	0.35
CFR5-105	5" Adjustable Constant Flow Regulator 60 to 105 CFM	5	60 to 105	4.74	2.44	0.35
CFR6-105	6" Adjustable Constant Flow Regulator 60 to 105 CFM	6	60 to 105	5.86	3.39	0.71
CFR6-175	6" Adjustable Constant Flow Regulator 105 to 175 CFM	6	105 to 175	5.86	3.39	0.71
CFR8-175*	8" Adjustable Constant Flow Regulator 105 to 175 CFM	8	105 to 175	7.57	3.39	1.05
CFR8-300	8" Adjustable Constant Flow Regulator 175 to 300 CFM	8	175 to 300	7.57	3.39	1.05
CFR10-300*	10" Adjustable Constant Flow Regulator 175 to 300 CFM	10	175 to 300	9.43	3.39	1.74
CFR10-410*	10" Adjustable Constant Flow Regulator 300 to 410 CFM	10	300 to 410	9.43	3.39	1.74

All the above are factory set for maximum flow rate but can be special ordered in bulk preset to desired flow rate.
*SPECIAL ORDER

Applications

Supply and exhaust air in offices, apartments, sleeping quarters in military facilities, submarines, etc.
Balancing exhaust and supply airflow in high-rise buildings
Bathroom exhaust
Air supply balancing for ceiling filter modules while maintaining constant airflow even as filter resistance increases
Regulation of make-up air
Regulating conditioned air to sealed crawlspace
Balancing supply airflow from roof-top A/C units
Supply and exhaust of heat recovery ventilation systems
Controlling outdoor air from central supply fan into individual fan coil units or heat pumps
Balancing airflow on fan powered terminal unit systems

Adjustment Process

Select the maximum flow rate (in CFM) from the performance curves table.
Note the Adjust Scale number next to the desired flow.
Loosen the adjustment screw.
Adjust the carriage that holds the regulator up and down to line up the top of the carriage with the desired adjustment scale number.