ORTO

Sound attenuating transfer unit

For the transfer of air through a wall
Fits in a rectangular wall opening
Simple to install
Designed for installation above a door
Accessories:
- VGR telescopic wall sleeve
Standard color White RAL 9003
- Other colors upon request

ORTO is a rectangular sound-attenuating transfer grille unit designed for installation in studded walls, featuring concealed fastening, sound-absorbing inner and outer wall plate baffles, a mounting frame, and a telescoping installation sleeve that prevents air leakage into the wall cavity.

AIR FLOW - PRESSURE DROP - Rw
ORTO Size	Hole in wall (in)	0.04 inWC cfm	0.06 inWC cfm	0.08 inWC cfm	Rw=Dn,ew (dB)
ORTO Size	Hole in wall (in)	0.04 inWC cfm	0.06 inWC cfm	0.08 inWC cfm	Rw=Dn,ew (dB)
300	11.8x2	57	68	78	46
500	19.7x2	91	110	129	43
700	27.6x2	131	157	189	40
800	31.5x2	157	186	222	40
The data applies to installation in a 4 in thick studded wall with a 108 sq ft transmission area. One transfer diffuser on each side of the wall.

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Include Accessory documents

Document	Article	Document type	Date	Download
Sound-attenuating transfer unit (pdf 484.33kB)	ORTOa	Technical catalogue	1/20/2021
Installation, commissioning, maintenance (pdf 295.71kB)	ORTOa	IOM Manual	1/20/2021