Europatent 3018284, US Patent 10,041,295, CA Patent 2,911,590.
VariVent® Twin is a patented variant for all single-rolled VariVent systems that improves insulation values by up to 60 % (when using 380 g/m² sheeting and with sufficient overlap of the sheeting at all sides of the wall aperture).
Double-rolled ventilation with an insulating air cushion achieved by the 5 cm (approx.) gap between the two sections of sheeting.
The rolling shaft is operated by a single power drive or manual drive, enabling collision-free synchronous rolling or unrolling of the sheeting.
A combination of different sheeting sections is possible to admit sufficient natural light to the building, something not feasible with insulated sheeting that admit little or even no light at all.
No ongoing electricity costs compared to systems with a blower that has to blow air into the sheeting sections continuously and that, when disabled by a power cut, causes the sheeting to fall downwards.
Rolling up the sheeting keeps it clean, even after years in service, and protects it from rodents. Isolated holes are easy to patch.
With power drive, fully automatic activation possible with LSR ventilation controller, even when windy and/ or rainy.
For cleaning purposes, the sheeting sections can be disconnected from their GKT telescopic couplings, leaving no condensation to pool and form mildew.
It is possible to retrofit existing single-rolled VariVent® systems.