VFR

Variant with rotary knob

Actuator with mechanical stops

Actuator with potentiometers

Conforms to VDI 6022

For the reliable balancing of volume flow rates

Circular flow adjustment dampers for the balancing of volume flows and pressures in supply air and extract air systems
■ Each flow adjustment damper carries a diagram with setting values that ensure rapid commissioning on site
■ Suitable for duct pressures up to 1000 Pa.
■ Volume flows can be set using a hand wheel and a scale on the outside of the casing
■ Simple retrofit of an actuator
■ Casing air leakage according to EN 1751, class C

Optional equipment and accessories
■ Actuator with potentiometer
■ Actuator with mechanical stops

General information

Application

Circular flow adjustment dampers Type VFR for the simple balancing of volume flows and pressures in air conditioning systems
Continuous variable adjustment of the volume flow by means of a hand wheel with position indicator
Simple retrofitting of an actuator
Pressure dependent leakage airflow with minimal setting (setting 0)

Special characteristics

Diagram with setting values on each flow adjustment damper
Simple retrofitting of an actuator

Nominal sizes

80, 100, 125, 140, 150, 160, 180 , 200, 224, 250

Construction

Galvanised sheet steel
A2: Stainless steel

Parts and characteristics

Ready-to-install flow adjustment damper
Hand wheel with position indicator
Continuous variable adjustment from 0 to 10
Diagram with setting values
Lip seal

Attachments

Min/Max actuators: actuators for switching between minimum and maximum volume flow setpoints
Modulating actuators: actuators for varying volume flow setpoints

Construction features

Spigot with lip seal, for circular connecting ducts to EN 1506 or EN 13180
Very good dimensional stability due to double grooves
Damper blade with a 3 mm circumferential gap, without a seal

Material and surfaces

Hand wheel, damper blade and plain bearings made of plastic, flame retardant (V-0) to UL 94

Galvanised sheet steel variant

Casing made of galvanised sheet steel

Stainless steel variant (A2)

Casing made of stainless steel 1.4301

Standards and guidelines

Meets the hygiene requirements of VDI 6022
Casing air leakage according to EN 1751, class C

Maintenance

Maintenance-free as construction and materials are not subject to wear

Disclosure of Chemicals

RoHS EU Directive 2011/65/EU (RoHS)

This product or single variants comply with EU Directive 2011/65/EU (RoHS) on the restriction of the use of certain hazardous substances in electrical and electronic equipment. For more information, please refer to our Environmental Product Declarations.

REACH 1907/2006 (EC Regulation REACH)

This product or single variants comply with the provisions of EC Regulation No. 1907/2006, also known as REACH (Registration, Evaluation, Authorisation and Restriction of Chemicals). For more information, please refer to our Environmental Product Declarations.

Technical information

Schematic illustration of the VFR VFR-Function

1 Damper blade
2 Volume flow scale
3 Hand wheel
4 Hand wheel locking screw
5 Lip seal
6 Diagram with setting values

For balancing the volume flows of duct sections and air terminal devices the differential pressure must be set on the flow adjustment dampers. The value to be set for a certain required volume flow at a given differential pressure can be taken from the diagram with setting values that each flow adjustment damper carries. This value can then be set using the hand wheel with the position indicator (continuous adjustment between 0 and 10).

Nominal sizes	80 – 250 mm
Volume flow range	20 – 485 l/s or 72 – 1746 m³/h
Minimum differential pressure	20 Pa
Maximum differential pressure	1000 Pa
Operating temperature	10 – 50 °C

Closed blade air leakage

NS	Δpst [Pa]
	100		200		500
	l/s	m³/h	l/s	m³/h	l/s	m³/h
80	9	32	13	46	20	72
100	13	45	18	64	28	101
125	16	58	23	82	36	130
140	17	61	25	89	39	140
150	18	66	26	93	41	148
160	21	76	30	107	47	169
180	19	69	27	98	43	155
200	21	74	29	105	46	166
224	22	80	32	114	50	180
250	25	89	35	125	55	198

This specification text describes just one variant of the product and applies to many applications. Texts for variants can be generated with our Easy Product Finder design programme.

Specification text

Circular flow adjustment dampers for the balancing of volume flow rates in ventilation and air conditioning systems, for supply air and extract air, available in 10 nominal sizes. Suitable for duct pressures up to 1000 Pa. Ready-to-install unit which consists of the casing with damper blade and rotary knob for the infinitely variable adjustment of volume flow rates. Spigot with lip seal for

ducts according to EN 1506 or EN 13180. Casing leakage to EN 1751, class C.

Special features

Diagram with setting values on each flow adjustment damper
Simple retrofitting of an actuator

Materials and surfaces

Hand wheel, damper blade and plain bearings made of plastic, flame retardant (V-0) to UL 94

Galvanised sheet steel variant

Casing made of galvanised sheet steel

Stainless steel variant (A2)

Casing made of stainless steel 1.4301

Construction

Galvanised sheet steel
A2: Stainless steel

Technical data

Nominal sizes: 80 to 250 mm
Volume flow range: 9 – 615 l/s or 32 – 2215 m³/h
Minimum differential pressure: 20 Pa
Maximum differential pressure: 1000 Pa

Sizing data

qv [m³/h]
Δpst [Pa]

Air-regenerated noise

LPA [dB(A)]

VFR	–	A2	/	160	/	E01
\|		\|		\|		\|
1		2		3		4

1 Type
VFR Flow adjustment damper

2 Material
No entry: galvanised sheet steel
A2 Stainless steel variant

3 Nominal size [mm]
80, 100, 125, 140, 150, 160, 180, 200, 224, 250

4 Actuator
No entry: manual operation
E01 3-point (min/max) actuator 24 V AC/DC with potentiometer setting
E02 3-point (min/max) actuator 230 V AC/DC with potentiometer setting
E03 continuous 0 - 10 V DC actuator 24 V AC/DC with potentiometer setting
M01 3-point (min/max) actuator 24 V AC/DC with mechanical stops
M02 3-point (min/max) actuator 230 V AC/DC with mechanical stops

Order Example: VFR/160/M01

Nominal size	160 mm
Actuator	24 V AC/DC, mechanical stops

Downloads

informazioni di prodotto

Product data sheet VFR

VFR_PD_2026_03_11_DE_en Product data sheet 1.3 MB pdf

certificati

Certificate concerning statistical leakage tests

LC_v1_2024_10_DE_en Certificate 660 KB pdf
Declaration of conformity or declaration of incorporation Type VFR

Declaration of conformity or declaration of incorporation 93 KB pdf
Environmental product Declaration VFR

VFR_EPD_2024_12_DE_en Environmental product Declaration 1.2 MB pdf

Referenze

TROX Services

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VFR

For the reliable balancing of volume flow rates

General information

Technical information

Closed blade air leakage

Downloads

informazioni di prodotto

Product data sheet VFR

certificati

Certificate concerning statistical leakage tests

Declaration of conformity or declaration of incorporation Type VFR

Environmental product Declaration VFR

Referenze

TROX Services

TECNICAMENTE NECESSARIO

STATISTICHE E ANALISI DEL SITO WEB

CONVENIENZA E PERSONALIZZAZIONE

PER LA MIGLIORE ESPERIENZA TROX