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The award winning G965 Dual Extended Telescopic Underfloor Void Ventilator is designed to provide a clear airflow passage to a void beneath an insulated suspended floor.
The G965 Dual Extended Telescopic Underfloor Void Ventilator is designed to provide a clear airflow passage to a void beneath an insulated suspended floor.
The current and future requirements of Part L of the Building Regulations along with other standards and regulations have led to an increase in the depth of thermal insulation in suspended floors along with an increase in cavity widths to accommodate greater amounts of cavity wall insulation. This has meant that clear access to an underfloor void may be as far as 6 or 7 brick courses (525mm) below the level of an airbrick and potentially as much as 350mm from the outer face of the external leaf. Traditional telescopic underfloor ventilators would not be able to achieve this without the use of additional vertical and horizontal extension sleeves.
The G965 offers a vertical telescopic adjustment of between 5 and 8 brick courses without the need for an extension sleeve. The horizontal outlet is long enough to bridge through an overall wall thickness of 350mm without the need for an additional extension.
The front aperture of the G965 is designed for use with a G930 Combination Airbrick or it can be used in conjunction with a traditional clay airbrick, although this would reduce the overall airflow through the system.
Allows ventilation to an insulated underfloor void
Allows a vertical extension of 5-8 courses (318mm-575mm)
Allows a horizontal span of 360mm (including G930).
The G965 should be fitted in at least two opposing walls to create a through flow of ventilation into an underfloor void. As N.H.B.C recommendations state “Ventilators should be placed at not more than two metre centres and within 450mm of each end of the wall”. Bricklaying should then be completed as normal although care should be taken to keep the air flow passage clear from mortar droppings.
Regulations & Standards
BRE Digest 17
BRE Digest 262
Building Regulations C4
NHBC Standards 5.2
BS 5250:2011 Control of Condensation in Building
|Size & Weight|
|Depth (?)||360 mm|
|Max Height (?)||575 mm|
|Min Height (?)||318 mm|
|Width (?)||225 mm|
|Features (?)||Independently tested to conform with the requirements of BS 8612.|
|Materials & Finishes|
|Certifications & Ratings|
|Standards (?)||NHBC Standards 5.2, Building Regulations C4, BRE Digest 262, BRE Digest 17, Control of Condensation in Building, BS 5250|
|Product ID (?)||G965|
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