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Mechanical CAV damper, Halton RMC
Mechanical CAV damper, Halton RMC

Halton RMC – Airflow management damper (CAV)

Mechanical CAV damper with the self-balancing operation. Pressure independent function.

  • Constant airflow damper without external power supply, self-balancing operation
  • Large operation area, a pressure range of 50…600 Pa and optionally up to 1000 Pa

Overview

• Constant airflow damper without external power supply, self-balancing operation
• Effective commissioning
• Large operation area, pressure range of 50…600 Pa and optionally up to 1000 Pa
• Galvanised steel design

Product models

• Models with and without insulated casing

Dimensions

Halton RMC/N (standard)

Halton RMC/I (insulated)

NS L L1 ØD
100 170 40 99
125 170 40 124
160 240 40 159
200 240 40 199
250 240 40 249
315 220 60 314
400 295 60 399

Material

Part Material
Housing Galvanised steel
Damper blade Aluminium
Damper blade bearings PTFE
Tube for the adjustment Plastic
Ring seals Rubber

Product models

Product model Code Description
Standard N No insulation
External insulation I Mineral wool, thickness 50 mm,
for sound insulation and reduction
of heat transfer

Function

Constant airflow damper Halton RMC is an independent control element operating without an external power supply, maintaining the required airflow rate regardless of upstream pressure changes. Consequently, system balancing is not needed.

As the dynamic pressure in the duct branch increases, the damper turns, thus increasing the pressure loss and preventing an excessive increase in the airflow rate. Similarly, as the dynamic pressure decreases, the spring returns the blade to the open position, reducing the pressure loss and thus maintaining a constant airflow rate.

The constant airflow damper includes a damper blade, supported by bearings and connected to an adjustment spring. As a result of the balance between aerodynamic forces and the spring effect, the necessary throttling effect is achieved and the set airflow rate is achieved.

Operation range

The constant airflow damper operates from a minimum pressure difference over the unit, which depends on the air velocity (see diagram below) to a maximum pressure difference of 1000 Pa.

For example, if air velocity in duct is 7 m/s, the unit pressure loss is approximately 100 Pa or above.

Size qv
min.
qv
max
qv
min.
qv
max
v
min.
v
max
dPst
min.*
dPs
max
mm m³/h m³/h l/s l/s m/s m/s Pa Pa
100 70 220 19 61 2.5 7.8 50 1000
125 100 280 28 78 2.3 6.3 50 1000
160 180 500 50 139 2.5 6.9 50 1000
200 250 900 69 250 2.2 8.0 50 1000
250 500 1500 139 417 2.8 8.5 50 1000
315 800 2200 222 611 2.8 7.8 50 1000
400 1000 3800 278 1250 2.2 8.4 50 1000

Control inaccuracy less than 20%.

Installation

Safety distances for the damper

The airflow control damper should be installed in undisturbed airflow. The airflow velocity profile in the duct should be sufficiently even, without disturbances caused by bends, T-branches etc.

The necessary safety distance after a bend or a T-branch is 3 x the duct diameter.

The airflow control damper should be installed so that the arrow on the damper corresponds to the direction of the airflow. See the installation examples below.

Specification

The constant airflow damper operates without an electric or pneumatic external power supply.
The damper operates with an adjustable spring.

The damper with a manual adjustment device shall be able to be easily set or reset on the work site, during commissioning.

The damper casing is made of galvanised steel and the blade of aluminium.
The damper casing is insulated with mineral wool as sound and heat insulation material (optional).

Order Code

RMC/S-D; ZT

S = Model
N     Standard
I       Insulated (casing 50 mm)

D = Duct connection (mm)
100, 125, 160, 200, 250, 315, 400

Other options and accessories

ZT = Tailored product
N        No
Y        Yes (ETO)

Code example

RMC/N-100, ZT=N

Downloads

Halton RMC – Airflow management damper (CAV)
Data
en
Halton RMC – Vakioilmavirtasäädin (CAV)
Data
fi
Halton RMC – CAV régulateur
Data
fr
Halton RMC – Konstantflödesdon (CAV)
Data
se
RMC CAV damper
Data
de
Halton RMC - fr
Datasheet
fr_FR
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