Simon Vent-A-Matic Static Window Ventilator 159mm DGSPBS

The Simon Vent-A-Matic DGSPBS is a continuous thru-air vent with a stormguard for weather protection. Also known as a 'gas vent'. Aperture (hole in glass) 159mm. All Vent-A-Matic models are designed for simple two part fitting into the glass aperture.