If the underfloor void is separated by dividing walls, openings must be provided to allow a free flow of air around the underfloor void. Easy-to-fit horizontal and vertical extension accessories designed for use with the 1201 and 1201XL Telescopic Underfloor Ventilators. Multiple units can be used to achieve greater depths and heights. Fits on to the lower rear opening of the telescopic underfloor ventilator to allow a standard 110mm external diameter plastic underground drainage pipe to be connected via a coupling connection.

Underfloor ventilation is a vital component in ensuring airflow for voids under suspended concrete and timber floors and ongoing changes to the Building Regulations continue to affect specifications and drive Manthorpe’s product development and innovation. To be installed with a DPC Cavity tray and wall weeps to collect any water ingress. We recommend Timloc’s IL4 and 2 weeps (Invisiweep or 1143). Our underfloor ventilation systems are entirely British manufactured, as are the majority of our products; proudly supporting British manufacturing and minimising risk in the supply chain and in your project schedules.The lower rear opening of the product must project down to the level of the underfloor void and must not be obstructed by the floor construction. A vertical extension sleeve is available to fit with this product if the standard 5 course step is not adequate.