Passive and Active Gas Venting to Structures
The Primary element in a gas protection system, is the the gas collection and dispersal system.A gas dispersal layer is installed below the concrete slab. This layer may either be a blanket or strips at predetermined centres dependant upon the site specific gas data. Alternatively, if the proposed structure has an undercroft, then this can be used for ventilation. Whether a blanket, strips or open void ventilate the underneath of the structure they would all still require to integrate with a series of vent terminations along the elevation of the structure.
	Gas dispersal blanket of geocomposite
Fork lift distributing rolls of geocomposite around site	Single cuspate geocomposite gas dispersal layer
All the venting terminations below have been manufactured within SEL Environmental's in-house fabrication facility. If there is a requirement for inconspicuous vent terminations around a structure whether ground level or elevated, SEL can manufactured these elements to satisfy any Client requirements on a project specific basis. SEL are always actively developing new and improved ways of providing vent inlets and outlets.
Ground level vent box with stainless steel cover	Slender vent unit - Only the stainless steel grill is visible at ground level
Mock victorian vent stack with rotating cowl	Stainless steel vent bollard