England · South West · fire protection
Dorchester (West Dorset) stair and corridor smoke control
Dorchester (West Dorset) (South West, England) has a published usual-resident population of 21,438 in 2019. Source: ONS towns 2019. That figure is residents, not a count of blocks with smoke vents. Coastal classification: Smaller non-coastal towns. ONS records population change of 32% between 2001 and 2019 for this built-up area. Classification on that source: Small. Workplace profile in the ONS towns file: Working. Deprivation band on the same file: Middle Deprivation.
Air handling is the other half of this service
Some plant rooms contain an AOV panel and an air-handling unit. The AHU’s fire interlock should stop comfort fans fighting a smoke path. We record the two systems on separate lines so a passed stair vent cannot hide a fan that only runs in hand.
Roof hatches fail in the weather
Head-of-stair lids take wind, water and bird mess. A perished cable gland full of water presents as a dead actuator. We look at hinges, the closer and the cable crossing the roof before we condemn the motor. A lid left open after a test is a leak on the top landing as well as a controls fault.
Automatic opening vents are life-safety smoke control, so this sits with fire protection and is quoted across the UK. Population figures are the published resident counts named above. They are not a survey of vents in Dorchester (West Dorset).
