URH - Extraction diffuser

General

The URH diffuser is primarily used for extraction. The URH diffuser can, in special circumstances, be used as a  wall-mounted supply air diffuser (however with relatively long throw).

The diffuser has a low sound pressure level, even when there is a relatively large pressure drop.

The URH diffuser is made of steel sheet with epoxy coating in white (RAL 9010) and fits directly inside the spiro tube with a bayonet mount (supplied as standard). The fixing frame is made of galvanised steel.

 

URH dele

Dimensioned sketch

URH

 

URH målskitse

Model ØW, mm ØD, mm H [mm]
URH100 140 99 13
URH125 165 124 13
URH160 200 159 13
Capacity and sound

URH

Capacity
Airflow qv (m3/h), total pressure drop pt (Pa), and sound level LpA (dB(A)) can be read off from the diagrams.

Pressure drop Δpt
The diagrams give the pressure drop pt (Pa) as the total pressure drop.

Sound level LpA
The diagrams give the sound level LpA (dB(A)) with a room sound attenuation of 4 dB.

 

URH100

URH100 kapacitetskurve

Selection example:
Requirements: qv = 54 m3/h (15 l/s)   Select: URH100  
  ΔPtot = 100 Pa      ΔPtot = 100 Pa 
  LpA ≤ 30 dB(A)      LpA ≤ 30 dB(A)
          Setting A = -2 mm

 

URH125

URH125 kapacitetskurve

URH160

URH160 kapacitetskurve

Integrated sound attenuation

URH

The fitting's integrated attenuation ΔL (dB) includes end reflections, equivalent to the intake diameter, see table.

Model Average frequency (Hz) ΔL (dB) 
125 250 500 1000 2000 4000
URH100 23 18 15 13 11 6
URH125 18 16 13 11 9 6
URH160 18 14 10 11 8 7
Initial adjustment

Initial adjustment of extraction

 

URH indregulering

The air stream is initially adjusted by positioning a measuring probe at the back of the diffuser as shown. The pressure difference (Δpm) between the measuring probe and the room is measured. Using the adjustment table and the measurement, the correct setting can be found that gives the desired airflow. The diffuser cone must then be locked once the correct setting has been found.

URH100 (A)
Coefficient (k)

A -15 -12 -9 -6 -3 0 3 6 9 12
k 0,43 0,63 0,83 1,02 1,22 1,42 1,65 1,88 2,11 2,33

 
URH125 (A)
coefficient (k)

A -15 -12 -9 -6 -3 0 3 6 9 12 15
k 0,65 0,92 1,22 1,53 1,84 2,17 2,52 2,83 3,14 3,46 3,77

 
URH160 (A)
coefficient (k)

A -12 -9 -6 -3 0 3 6 9 12 15 18
k 1,16 1,51 1,90 2,31 2,75 3,25 3,73 4,22 4,67 5,12 5,58

 
Airflow is calculated from the following: qv = k • √Δpm (l/s)

Installation

URH

When installing directly after a 90° angle or a T joint, the measurement ΔPm must be corrected according to the table below.

Model URH enkelt kanal URH bøjet kanal URH dobbelt kanal
URH100 Δpm = Δp ΔPm = ΔP
URH125 Δpm = Δp Δpm = 0.98 Δp
URH160 Δpm = Δp Δpm = 1.04 Δp

Add all about the product series URH - Extraction diffuser

CONTACT US TODAY

Get free advice on ventilation products and system solutions


Export Requests:
EXHAUSTO Export
Odensevej 76
DK 5550 Langeskov

Tel +45 6566 1236
E-mail: export@exhausto.dk
Calculation_300W

Calculation programs

Use EXHAUSTO's free calculation programs for calculating ventilation plant and system solutions

Go to Calculation Programs
Vex overview

VEX Summary

Get a quick overview of our entire range of compact VEX air handling units with heat recovery.

View the VEX summary here