Ventilation hygiene and air quality

Ventilation system remedial works

Airmec has an experienced mechanical and electrical team capable of undertaking a broad range of ventilation system remedial works, including:

• Fire damper replacement
• Ventilation ductwork modification and replacement
• Fire stopping and fire barrier replacement
• AHU remedial works and upgrades
• Fan motor and fan replacement
• AHU controls and electrical upgrades

Indoor air quality monitoring and assessments

Poor air quality within the indoor environment can result in occupants experiencing several health problems including fatigue, skin irritation and breathing difficulties. Common causes of such issues are poor ventilation and the presence of air pollutants.

Our surveyors can test and monitor the quality of the air within a building by undertaking an Indoor Air Quality survey. The survey will assess temperature and humidity levels, and check that carbon dioxide and carbon monoxide levels remain in line with current guidance. We can also assess dust, fungal, bacteriological contamination and other specific pollutants as required.

We will review any results obtained against HSE guidelines and, where necessary, make recommendations to improve conditions.

Occupational Hygiene Assessments

Where there is a risk to health from inhalation of a hazardous substance, or possible damage to hearing through excessive noise, our occupational hygiene services can assist you to protect staff wellbeing and comply with regulations.

We can undertake a variety of monitoring services to measure exposure levels to dust, fumes, and noise. Once we understand the levels of occupational exposure, we will recommend appropriate control measures to protect staff from the associated risks.

Local Exhaust Ventilation (LEV) Examination and Testing

In any environment where dangerous dust and fumes are generated there needs to be a process in place to protect workers from these harmful substances, as defined by HSE COSHH regulations. Often the best way to contain and control such substances is via a local exhaust ventilation system.

To keep LEV systems working efficiently and prevent operative exposure to hazardous fumes and dust, LEVs need to be regularly examined and tested by a competent person, at least every 14 months, as defined in HSE document HSG 258. At Airmec we regularly inspect and test LEVs in various locations and can advise on and undertake remedial works required.

Kitchen Extract Grease Monitoring and Cleaning

Commercial kitchen grease extract systems must be regularly inspected and cleaned to remove grease and control the fire risk associated with its accumulation. The usage of the kitchen and grease deposit thickness readings will determine how frequently the extraction ventilation and ducting need cleaning. Grease readings should be taken at regular intervals based on system usage and historical grease reading information to ensure the cleans are undertaken as required.

As members of BESA (Building Engineering Services Association) and approved Vent Hygiene Register (VHR) contractors, we follow grease-specific BESA duct cleaning guidance TR19® for all our kitchen extract inspections and cleans.

As part of our kitchen extract cleaning service, we will clean and decontaminate the entire kitchen extract system, including any associated ductwork, filters, and fan units. Any inaccessible areas will be highlighted in our report, which will include recommendations for necessary remediation works.

Our experienced team includes trained Grease Hygiene Technicians (GHT) and Grease Hygiene Operatives (GHO) and we can always schedule a GHT to lead a kitchen grease extract clean.

Air handling unit maintenance

Regular planned maintenance of your air handling unit is important to maintain its efficiency and ensure the ductwork remains clean and free from any debris that may become trapped within the system.

We have extensive experience cleaning air handling units and associated ductwork. As part of our service, we will clean all surfaces of the unit ensuring all debris and dust are removed and check the status of all components including filters and fan belts. If required, we can take contact slides to analyse the interior surfaces of the systems for fungal and bacterial activity.

All maintenance work is captured in a post-clean report with before and after photographs, along with recommendations for any remedial work necessary such as replacing filters and fan belts.

Ventilation duct cleaning

We are experts in duct cleaning.

We will inspect and risk assess your system and advise on the scope and frequency for a ventilation clean, and then send our trained specilists to clean and decontaminate your system.

As part of our service, we can clean all accessible ventilation ductwork and components from the fresh air intake through to the AHU, supply and extract ductwork, including internal grilles plus any fan units. Following the work, we will provide a comprehensive post-clean report showing before and after photographs which detail the work carried out, and outline any additional remedial work needed.

We are members of the Building Engineering Services Association (BESA) and are approved Ventilation Hygiene Register (VHR) contractors, giving you assurance of compliance and cleaning to TR19® Air and TR19 Grease® standards.

Ventilation system hygiene surveys and risk assessments

The starting point for any air hygiene work is a survey and risk assessment of the ventilation system or a building’s indoor environment. For most facilities, air hygiene surveys are required every 2 years (reference BS EN 15780:2011 Ventilation for buildings – Ductwork – Cleanliness of ventilation systems).

One of our experienced ventilation system surveyors will undertake a survey and risk assessment of the various ductwork systems and air handling units within your building. Following a thorough inspection, we will provide a condition report with recommendations for an appropriate maintenance regime, plus any associated remedial actions required. Your report can be used as part of an audit to demonstrate that a programme of inspection, and necessary cleaning of the ventilation system has taken place.

Some facilities with more demanding requirements for air cleanliness, including healthcare buildings, require air hygiene surveys every 12 months. We have significant experience of surveying and inspecting healthcare ventilation systems in accordance with the requirements of Health Technical Memorandum 03-01 – Specialised ventilation for healthcare premises.