1201 Airbrick

Not required.

1201 Telescopic underfloor vent.

Guidance for specification option:

Adjustable ventilator for ground floors up to five brick courses.

1201XL Telescopic underfloor vent.

Guidance for specification option:

Adjustable ventilator for ground floors up to seven brick courses.

1203 Horizontal front extension.

Guidance for specification option:

Fits between the airbrick and upper front opening of the telescopic

underfloor ventilator (1201 or 1201XL) to accommodate external walls of more than 102.5 mm thickness, up to a maximum of 215 mm.

1204 Vertical extension sleeve.

Guidance for specification option:

Fits between the upper and lower parts of the telescopic underfloor

ventilator (1201 or 1201XL) to accommodate a vertical step of six to seven brick courses.

1205 Duct adaptor.

Guidance for specification option:

Fits on to the lower rear opening of the telescopic underfloor ventilator (1201 or 1201XL) to allow a standard 110 mm external diameter plastic underground drainage pipe to be connected via a coupling connection.

1206 Horizontal rear extension.

Guidance for specification option:

Fits into the lower rear opening of the telescopic underfloor ventilator (1201 or 1201XL) to accommodate cavity widths of 50–150 mm, or internal walls of more than 100 mm thickness, up to a maximum of 200 mm.