TR19® Air vs TR19® Grease – What’s the Difference?
The terms TR19® Air and TR19® Grease are often used interchangeably, but they are two separate industry specifications covering different types of ventilation systems.
Understanding which standard applies to your building is essential for maintaining ventilation hygiene, reducing risk and ensuring systems are managed appropriately.
What is TR19® Air?
TR19® Air is the industry specification for the inspection, cleaning and verification of general ventilation systems.
It applies to ventilation systems that move clean air throughout buildings, including supply and extract ductwork, air handling units (AHUs), grilles, diffusers and associated ventilation components.
The primary objective of TR19® Air is to maintain ventilation hygiene, support good indoor air quality and help systems continue operating efficiently.
It is commonly applied in:
- Offices
- Healthcare facilities
- Schools and universities
- Retail premises
- Industrial buildings
- Warehouses
- Public buildings
What is TR19® Grease?
TR19® Grease focuses specifically on commercial kitchen extract systems.
During cooking, grease, oils and combustible deposits accumulate inside canopies, ductwork, extract fans and filtration equipment. If these deposits are not removed regularly, they can present a significant fire risk.
TR19® Grease provides guidance for managing this risk through routine inspection, cleaning and certification.
It typically applies to:
- Restaurants
- Hotels
- Care homes
- Hospitals
- Schools
- Pubs
- Commercial kitchens
- Food production facilities
The Main Difference
Although both documents relate to ventilation hygiene, their purpose is different.
TR19® Air is concerned with maintaining the cleanliness and performance of general ventilation systems.
TR19® Grease is primarily focused on reducing fire risk within commercial kitchen extract systems by removing grease deposits.
One standard supports indoor air quality and system efficiency, while the other helps manage a recognised fire hazard.
Can a Building Require Both?
Yes.
Many commercial buildings contain both general ventilation systems and commercial kitchen extract systems.
For example, a hospital may have air handling units serving wards and offices, while also operating several commercial kitchens.
In this situation:
- General ventilation systems would typically be managed in accordance with TR19® Air.
- Kitchen extract systems would normally follow TR19® Grease guidance.
Each system should be assessed independently according to its intended use.
Why Regular Inspections Matter
Neither standard recommends relying solely on fixed cleaning intervals.
Instead, both promote planned inspections to assess system condition and determine when cleaning is required.
Routine inspections help identify contamination before it affects system performance, indoor air quality or, in the case of kitchen extract systems, increases fire risk.
What Documentation Should You Receive?
Following inspection or cleaning, building owners should receive clear documentation detailing the work completed.
Depending on the project, this may include:
- Inspection reports
- Photographic evidence
- Cleanliness verification
- Asset information
- Cleaning records
- Recommendations for future maintenance
Maintaining accurate records supports planned maintenance and provides evidence that ventilation systems are being professionally managed.
Which Standard Applies to Your Building?
The answer depends entirely on the type of ventilation system.
If your system distributes fresh air throughout offices, healthcare facilities, schools or commercial buildings, TR19® Air is likely to be the relevant specification.
If your system removes cooking fumes, grease and heat from a commercial kitchen, TR19® Grease will normally apply.
Many organisations require both standards across different parts of the same building.
Understanding the distinction helps ensure every ventilation system receives the appropriate level of inspection, cleaning and maintenance while supporting safe, efficient building operation.