Process & access
Reaching a kitchen extract system can mean entering risers and plant rooms and working on the roof - two of the higher-risk activities in the trade, each with its own legal duties.
The short answer
Cleaning a kitchen extract system is not only greasy work - reaching it can be genuinely hazardous. Large ducts, vertical risers and plant rooms can count as confined spaces, and roof-mounted fans and rooftop discharge mean working at height. Both are among the more dangerous activities in building maintenance, and both are governed by specific law: the Confined Spaces Regulations 1997 and the Work at Height Regulations 2005. A contractor who takes these seriously is not being slow; they are doing the part of the job that keeps people alive.
Confined spaces
Under the Confined Spaces Regulations 1997, a confined space is one that is substantially enclosed and where there is a reasonably foreseeable risk of serious injury - from atmosphere, engulfment or similar. A walk-in duct, a riser or an enclosed plant room can fall within that definition. The law sets a strict order of priority: avoid entry altogether where reasonably practicable, for example by cleaning from outside with long-reach equipment; if entry is unavoidable, follow a safe system of work; and put adequate emergency and rescue arrangements in place before anyone goes in.
That last point is not a formality. Health and Safety Executive figures consistently show that around two-thirds of confined-space deaths are would-be rescuers - people who enter to help a colleague and are overcome themselves. It is why rescue arrangements have to exist before entry, not be improvised in a crisis, and why competence and planning matter so much for any duct work that involves going inside the system.
Working at height
Roof fans, rooftop discharge and tall risers bring the Work at Height Regulations 2005 into play. There is no minimum height - any fall liable to cause injury is in scope - and the duty does not shrink just because a task is short. The regulations set their own hierarchy: avoid working at height where reasonably practicable, then prevent falls using collective measures like guardrails, scaffolding or a proper platform, and only then minimise the consequences with personal measures such as a harness and fall-arrest system backed by a rescue plan.
Responsibility here is shared, and that is worth knowing as a site operator. The duty holders include not just the operative but whoever controls or arranges the work - facilities managers and building owners who bring in a contractor. Fragile roof surfaces such as rooflights are a particular hazard covered specifically by the regulations. Underpinning all of it, the Management of Health and Safety at Work Regulations 1999 require a suitable and sufficient risk assessment - which is where planning the access safely begins.
Safe access is part of a competent clean, not an add-on
The confined-space and work-at-height rules are not paperwork bolted onto the clean - they are how a competent contractor reaches your system without harming anyone or leaving you exposed as a duty holder. Planned access, safe systems of work and rescue arrangements are the mark of a professional clean, and their absence is a warning sign whatever the price looks like.
Questions
When it means entering a space that is substantially enclosed with a reasonably foreseeable risk of serious injury - such as a large walk-in duct, a riser or an enclosed plant room. The Confined Spaces Regulations 1997 then apply.
In order of priority: avoid entry where reasonably practicable, follow a safe system of work if entry is unavoidable, and have adequate emergency and rescue arrangements in place before anyone enters.
Because HSE figures show around two-thirds of confined-space deaths are would-be rescuers overcome while trying to help. Rescue arrangements must exist before entry, not be improvised.
Any work where a person could fall a distance liable to cause injury - roof fans, rooftop discharge and tall risers all qualify. There is no minimum height, and short tasks are still covered.
Partly. Duty holders under the Work at Height Regulations include those who control or arrange the work, such as facilities managers and building owners who instruct a contractor, not just the operative.
Phoenix Duct Clean · by the numbers
We plan access around the Confined Spaces and Work at Height Regulations - safe systems of work, the right equipment and rescue arrangements - so the clean is done without cutting corners.