Ventilator Shaft at Ngr Sy 7028 7217 is a Grade II listed building in the Dorset local planning authority area, England. Ventilator shaft.

Ventilator Shaft at Ngr Sy 7028 7217

WRENN ID
muffled-jade-saffron
Grade
II
Local Planning Authority
Dorset
Constituency
South Dorset MP: Lloyd Hatton (Lab)
Country
England
Type
Ventilator shaft
Address
Ventilator Shaft at Ngr Sy 7028 7217, the Grove, Portland
OS grid reference
SY 702 721
Coordinates
50.54853, -2.42082
Source
Historic England listing

Also on this page: flood risk · radon risk · weather exposure · detailed attributes ↓

Description

The ventilator shaft, dating from around 1870, is part of the sewer system and is constructed from Portland ashlar. It features an octagonal shaft that sits on a high base and pedestal. There is a cavetto-moulded string approximately 2.5 meters above the base, leading to a tapered shaft capped with an ovolo mould, a frieze, and a necking band. The shaft includes eight cast-iron vents positioned about 0.5 meters above the string. The total height of the shaft is approximately 7.5 meters, with each side of the octagon measuring around 570 millimeters at the pedestal. This structure is located in the garden of the former Governor's house, about 75 meters south of The Grove, and is one of three remaining shafts in the area.

Local climate

Ventilator Shaft at Ngr Sy 7028 7217 receives an average of 840 mm of rain a year. This makes it wetter than 55% of listed buildings in the UK. Its exposure to wind-driven rain is greater than that of 77% of listed buildings.

It experiences an average of 13 freeze-thaw cycles a year, fewer than 88% of listed buildings. Of these, 5 follow at least 1 mm of rain in the preceding 48 hours. Average temperatures at this location have risen by 0.3°C per decade since 1991.

Averages for 1991–2020; temperature trend 1991–2025. Figures describe the wider area (a grid cell of roughly 10 km), not the individual site. Contains modified Copernicus Climate Change Service information 2026.

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