Home > Companies > Manthorpe Building Products Ltd > G960 Telescopic Under Floor Void Ventilator

The G960 telescopic underfloor ventilator is designed to provide a clear airflow passage to the void beneath a suspended floor. The telescopic feature enables the G960 to adjust vertically between three and five brick courses; although a G961 vertical extension sleeve is also available for further multiples of two course adjustment as required.

The rear of the vent features a rodent grille consisting of evenly spaced slots specifically sized to prohibit entry of rodents and building debris which could block the vent. The front aperture is able to take a G930 airbrick to achieve correct airflow requirements. The aperture can also accept a standard clay airbrick, albeit with a reduced airflow.

The G960 ventilator should be installed during the normal course of bricklaying. If fitted above the DPC, a suitable cavity tray should be provided. The ventilator should be fitted in at least two opposing walls to create a through flow of air: NHBC recommendations state 'Ventilators should be placed at maximum two metre centres and within 450 mm of each end of the wall'. Bricklaying should then be completed as normal, although care should be taken to keep the air passage clear of mortar droppings.

The G960 should be used in conjunction with other Manthorpe products to provide a complete through wall ventilation system.

Standard product features



Size (l x w x h):

208 x 222 x 212–364 mm (telescopic adjustment, 152 mm).

Free airflow:

6600 mm².

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-80-50/394 Ventilation ducts

Product specification

An important note about specifying



Manthorpe Building Products Ltd


+44 (0)1773 303000

Product reference

G960 Telescopic Under Floor Void Ventilator

Manufacturer details

Manthorpe House,
Brittain Drive,
Codnor Gate Business Park,
Derbyshire, DE5 3ND
Tel +44 (0)1773 303000
Fax +44 (0)1773 303300
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