Skip to content

Product / URH

Halton URH – Exhaust air valve

For exhaust air with attenuation

  • Adjustable airflow rate
  • Wall or ceiling installation
Request a Quote


  • Exhaust air valve
  • Wall or ceiling installation
  • Adjustable airflow rate
  • Ability to measure airflow rate
  • Attenuates duct noise
  • Installation with or without a separate installation frame

Product models and accessories

  • Installation with fixed springs
  • Alternative installation frame options

Dimensions and weight

100 140 13 98
125 165 13 122
160 200 13 158
200 251 13 198


NS [kg]
100 0.29
125 0.40
160 0.55
200 0.83


Part Material Note
Collar Steel
Central cone Steel
Gasket Polyurethane
Installation frame Galvanised steel Gasket of rubber compound
Protection ring Steel
Finishing Painted
white (RAL 9003)
Special colours available


Accessory Code Description
Cover plate CS For protection of the surfaces from smudging and for directing the air jet
in a grid-structured ceiling
Extension part EP Extension part for detaching the valve from the surface/ standard height 50 mm
Installation frame LF Installation frame without gasket/ height 50 mm
Installation frame GF Installation frame with gasket/ height 50 mm
Installation frame DF Installation frame with duct dimensions can be installed directly to duct parts such as bending or T-branch etc

Fig.1. Cover plate (CS)                               Fig.2. Extensions part (EP)

Fig.3. Installation frame (LF)                        Fig.4. Installation frame (GF)

Fig.5.  Installation frame (DF)


The valve throttles the exhaust airflow and attenuates the duct noise. The pressure drop is dependant on the position of the central cone. The desired exhaust airflow rate is adjusted during the balancing of the airflows in a ductwork system. After the adjustment the valve is locked at the required adjustment position.


The Halton URH exhaust valve is mounted with the aid of a separate installation frame LF, GF or DF. Push the installation frame into the duct and fix it. Push the valve into the installation frame and turn until it is firmly attached.
Alternatively model URH/B can be installed directly into a duct without an installation frame.

Installation with protection ring (CS)

100 290
125 315
160 350
200 400


The Halton URH valve is adjusted by rotating the central cone. Measure the opening (A) position (in mm) of the central cone. Set a probe inside the valve and measure the differential pressure with a manometer. The airflow rate is calculated using the formula below. After the adjustment, lock the central cone with the locking nut.

URH Ø 100
URH Ø 100
URH Ø 125 
URH Ø 125 
URH Ø 160
URH Ø 160
URH Ø 200
URH Ø 200
-15 0,43 -15 0,65 -12 1,16 3 1,78
-12 0,63 -12 0,92 -9 1,51 6 2,46
-9 0,83 -9 1,22 -6 1,9 9 3,24
-6 1,02 -6 1,53 -3 2,31 12 3,97
-3 1,22 -3 1,84 0 2,75 15 4,69
0 1,42 0 2,17 3 3,25 20 5,88
3 1,65 3 2,52 6 3,73 25 6,95
6 1,88 6 2,83 9 4,22
9 2,11 9 3,14 12 4,67
12 2,33 12 3,46 15 5,12
15 3,77 18 5,58


1.   Central cone
2.   Locking nut
3.   Sleeve

Loosen the valve from the ductwork by turning counter-clockwise. Note the adjusted opening position of the central cone.
Wipe the parts with a damp cloth, instead of immersing in water. Reassemble valve in reverse order after cleaning.


The  exhaust valve shall have an adjustable central cone and sleeve made of painted steel, with a white (RAL 9003) standard colour. The valve shall be fitted with a galvanised steel installation frame. The installation frame shall incorporate a sealing gasket.

Alternative: The valve shall be fixed with springs directly into a duct.

The opening position of the central cone shall be adjusted during balancing in order to achieve required pressure loss and airflow rate. After balancing the central cone shall be locked to the selected adjustment position.

Order code


S = Model
A    Standard
B    With fastening springs

D = Duct connection size (mm)
100, 125, 160, 200

Other options and accessories

CO = Colour
SW    Signal white (RAL 9003)
X        Special colour (RAL xxxx)

ZT  = Tailored product
N        No
Y        Yes (ETO)

Sub products

CS     Cover plate
EP     Extension part
DF     Installation frame for duct parts
GF     Installation frame with gasket
LF      Installation frame without gasket

Code example

URH/A-100, CO=SW, ZT=N


Contact Us
  • Hidden
  • Max. file size: 64 MB.