TIMLOC 1201XL TELESCOPIC UNDERFLOOR VENT

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• Always use in conjunction with a Timloc airbrick.
• The airbrick and upper front opening of the telescopic underfloor ventilator must be positioned above the finished external ground level – usually at the same level as the ground level DPC • 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 7 course step is not adequate.
• Building Regulations require a free airflow below suspended ground floors of at least 1500mm2 per metre run of wall. This can be achieved by spacing the ventilators at 4m centres, however, such a wide spacing is not recommended as stagnant air pockets could form in the underfloor void. Timloc recommend a spacing of not more than 2m centres to comply with NHBC standards.
• The NHBC recommend that underfloor ventilators are spaced at a maximum of 2m centres, with ventilators also positioned not more than 450mm from the ends of the wall.
• As a minimum requirement, ventilators should be positioned down two opposite sides of the building so as to create a cross flow ventilation action. It is good practice to position ventilators around the full perimeter of the building, particularly with complex building designs.
• If the underfloor void is separated by dividing walls, openings must be provided to allow a free flow of air around the underfloor void.
• The standard ventilator will fit into a cavity wall with an external leaf of 100-102.5mm, a minimum cavity width of 50mm and across a cavity of 100mm.
• External and internal horizontal extension sleeves are available to accommodate thicker walls or wider cavities 1201XL telescopic underfloor vent Adjustable ventilator for ground floors up to 7 brick courses incorporating vermin grille.
• 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).
• It may be a requirement to protect with a lintel for direct loads.

*Airbricks sold separately