Window Acoustic Trickle Ventilator Sonovent D

Adjustable flap, horizontal strip ventilator with acoustic attenuation, for mounting under ventilation tiles over occupied roofs.
- Enables effective ventilation of roofspaces with minimal visual intrusion, acoustic attenuation, protection from weather and insects. Choice of unit size. Equivalent area: 33,786 34,032 mm /m. Five intermediate settings.
- Suitable for insertion from above or below.
- Projecting outer profile with weathered lip to opening. Tiles must allow clearance.
- Projecting inner profile with trim flange and slotted fascia. Removable for maintenance.
- Aluminium profiles with plastic end caps. Made to measure.
- Internal acoustic attenuation lining.
- Self regulating, class P3. Incorporates secondary flap which closes as external wind speed rises.
- Watertight in closed position to wind pressure 650 Pa.
- Windtight in closed position to wind pressure 650 Pa.
- Thermally broken.
- Choice of manual, cord or rod operation.
- Unit width (maximum): 2 m, made to measure.
- Acoustic attenuation depending on model (open): 37 39 dB, to EN ISO 140 and EN ISO 717.