CIRCO

Sound attenuating transfer unit

For the transfer of air through a wall
Fits in a circular cut opening
Simple to install
Mounting frame integrated into the transfer diffuser
Accessories:
- TRAC disc valve
- VGC telescopic wall sleeve
Standard colour White RAL 9003
- 5 alternative standard colours
- Other colours upon request

Calculate with your requirements

Design

Material and surface treatment

The baffles are made of sheet steel. The mounting frame is made of galvanised sheet steel. The baffles are painted.

Standard colour:
- RAL 9003, signal white, gloss 40
Alternative standard colours
- RAL 9006, white aluminium, gloss 80
- RAL 9007, grey aluminium, gloss 80
- RAL 9010, pure white, gloss 40
- RAL 9005, jet black, gloss 35
- RAL 7037, dusty grey, gloss 30
Non-painted finish and other colours available on request.

AIR FLOW - PRESSURE DROP - Rw
CIRCO Size	Hole in wall (mm)	10 Pa		15 Pa		20 Pa		Rw=Dn,ew (dB)
CIRCO Size	Hole in wall (mm)	l/s	m3/h	l/s	m3/h	l/s	m3/h	Rw=Dn,ew (dB)
80-125	80	14	50	17	61	20	72	50
80-125	100	20	72	23	83	28	101	47
80-125	125	24	86	30	108	34	122	45
160	160	39	140	46	130	54	194	42
The data applies to installation in a 100 mm thick studded wall with a 10 m² transmission area. One transfer diffuser on each side of the wall.

Nordic Swan listed

The product is listed in the database for building products that can be used in Nordic Swan Ecolabelled buildings.

Filter

Include Accessory documents

Document	Article	Document type	Date
Sound-attenuating transfer unit (pdf 568.2kB)	CIRCOa	Technical catalogue	22/04/2021
Installation, commissioning, maintenance (pdf 378.89kB)	CIRCOa	IOM Manual	20/05/2019
Nano certificate (pdf 71.51kB)	Air diffusers	Quality	03/10/2023
Overview - Air diffusers (pdf 4.28MB)	Air diffusers	Brochure	21/02/2025
Commissioning guide - Air diffusers, VAV/CAV- & Commissioning dampers (pdf 7.73MB)	Air diffusers, VAV/CAV- & Commissioning dampers	IOM Manual	27/02/2025
Product description - Air diffusers & dampers (pdf 249.19kB)	Air diffusers & dampers	IOM Manual	19/10/2023

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