Telescopic Underfloor Ventilator and Extension Accessories
Telescopic (adjustable) underfloor ventilator to provide ventilation beneath suspended ground floors (equivalent area of 6000mm²).
Always to be used in conjunction with the Timloc Airbrick (1201AB).
The vertical height of the ventilator unit adjusts to suit between 3 and 5 brick courses (225-375mm) with a minimum cavity width of 50mm.
Extensive range of quick and easy to fit horizontal and vertical extension accessories (doesn't restrict air flow through the ventilator):
- horizontal front extension sleeve
- vertical extension sleeve
- duct adaptor
- horizontal rear extension sleeve.
- top hat gas barrier
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Features & Benefits
- Special grille included to prevent the entry of vermin on telescopic underfloor vent
- Very tough and robust material
- Accessories don't restrict airflow through the main telescopic underfloor vent unit
- Purpose-made accessories eliminate the need for on site modifications
- Lightweight and easy to handle
- Material totally resistant to decay
- Standard brick and block constructions
- To be used to provide ventilation below suspended ground floors and should always be used in conjunction with a Timloc Airbrick (1201 AB)
- To provide horizontal or vertical extension to a telescopic underfloor ventilator to accommodate different wall/cavity/brick courses
The NHBC recommend that underfloor ventilators are spaced at a maximum of 2 metre 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 to create a cross flow action. We recommend the good practice of positioning underfloor ventilators around the full perimeter of the building.
Telescopic Underfloor Ventilator (1201) - adjustable for a step of 3, 4 or 5 brick courses and presents an equivalent of 6,000mm² per unit.
Horizontal Front Extension (1203) - fits between the airbrick and upper front opening of the telescopic underfloor vent to accommodate external walls of more than 102.5mm thickness - up to 215mm (multiple units can be fitted and trimmed to suit wall thicknesses above this).
Vertical Extension Sleeve (1204) – fits between the upper and lower parts of the telescopic underfloor vent to accommodate a vertical step of more than 5 brick courses (multiple units can be stacked together to achieve required height).
Duct Adaptor (1205) – fits onto the lower rear opening of the telescopic underfloor ventilator to allow a standard 110mm internal diameter soil pipe to be connected (compression fitting may be required).
Horizontal Rear Extension Sleeve Product (1206) – fits into the lower rear opening of the telescopic underfloor ventilator to accommodate cavity widths between 50-150mm – or internal walls of more than 100mm thickness (200mm max.).
Top Hat (77121) - Top hat collar to seal telescopic underfloor vent where gas protection is required
How to Order
- Measure the length of each wall requiring telescopic underfloor ventilators and divide by 2m to establish the quantity required
- Always round up if the calculation does not work out to an exact whole number
- 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
- 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 a cross cavity of 100mm
- External and internal horizontal extension sleeves are available to accommodate thicker walls or wider cavities
Regulations and Standards
- Satisfies all NHBC Standards
- Manufactured to BS EN ISO 9001
- Complies with all relevant Building Regulations
- Meets all relevant British Standards
- ‘Equivalent Area’ tested by BRE to BS EN 13141-1:2004
Material and Colour Choice
- Manufactured by injection moulding in polypropylene
- 1201 and extension accessories available in black only