﻿Passivent combines daylight and natural ventilation in a single unit
Passivent’s Sunstract combines natural ventilation and the company’s Sunscoop rooflight technology into a single product for medium and large commercial buildings. Sunstract contributes to compliance with the carbon emission levels required in Building Regulations Approved Document L, which came into force on 1 October.
Sunstract applies technology from the Airstract high-capacity thermally insulated passive-stack ventilation terminal with an 885 mm Sunscoop square-ducted rooflight. The rooflight’s diffused polycarbonate double or triple glazing captures daylight, which is reflected off internal mirrored louvres and down a highly reflective stack through a ventilated ceiling adaptor to the internal space below.
Ventilation louvres within the roof-mounted terminal allow natural convention air movement to draw used internal air up the stack and exhaust it outdoors. The system has minimal electrical consumption.
Sunstract can be installed in lengths up to 10 m from roof base unit to ceiling adaptor. Each unit provides a ventilation area of 0.55 m2. Even the longest Sunstract provides more light than eight 100 W light bulbs.
These units have an AA fire rating, enabling unrestricted use regardless of proximity to neighbouring buildings.