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 mm²/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.