NAAD21 Kitchen Extract Cleaning Compliance — Pembrokeshire

NAAD21 (current version: NAAD-21:2025) is a verification and compliance standard for kitchen extract and air duct cleaning published by NAADUK — the National Association of Air Duct Specialists UK. It provides a documented method of proving to insurers, fire safety officers and environmental health inspectors that a commercial kitchen extract system has been professionally cleaned to a recognised standard. For Pembrokeshire food businesses, meeting NAAD21 requirements is an increasingly important part of maintaining valid commercial kitchen insurance cover.

What is NAAD21?

NAAD21 is published by NAADUK (National Association of Air Duct Specialists UK), an industry body founded in 2015 to establish and promote professional standards for air duct and kitchen extract cleaning contractors in the UK. NAADUK members are trained, qualified and certified to standards equivalent to TR/19 (BESA), BS 9999 (fire safety) and BSEN 15780 (ventilation hygiene).

The current version — NAAD-21:2025 — is structured in two parts. Part 1 covers grease accumulation in kitchen extract systems (the direct concern for food businesses). Part 2 covers indoor air quality for broader ventilation systems beyond the kitchen environment.

NAAD21 is not a piece of legislation and it is not a legal requirement in the way that the Regulatory Reform (Fire Safety) Order 2005 is. However, it is treated by commercial property insurers as a compliance benchmark — a document that defines what "properly maintained" means for a kitchen extract system. This is the same function that TR/19 performs, and in practice the two standards are used alongside each other.

NAAD21 vs TR/19 — What's the Difference?

This is one of the most common questions from commercial kitchen operators in Pembrokeshire. The short answer is: they are complementary standards that cover overlapping ground. Most professional extract cleaning contractors working to one are also working to the other.

TR/19 (full title: TR19 Grease: Guide to Good Practice: Fire Risk Management of Grease Accumulation within Kitchen Extract Systems) is published by BESA — the Building Engineering Services Association. It is the established industry standard for kitchen extract hygiene in the UK and the primary document referenced by commercial insurers when assessing kitchen fire risk.

NAAD21 covers similar ground with broader scope. Where TR/19 focuses specifically on fire risk from grease accumulation, NAAD21 Part 1 addresses the full range of kitchen extract hygiene verification requirements, including grease thickness measurement methodology and photographic evidence standards that TR/19 does not mandate in the same detail. NAAD21 Part 2 extends the scope to indoor air quality across non-kitchen ventilation systems.

For a Pembrokeshire food business, the practical implication is clear: a clean that is documented to both NAAD21 and TR/19 standards provides the strongest possible compliance record for insurance, fire safety and EHO purposes. See our TR19 extract cleaning service page for more on the TR/19 standard specifically.

NAAD21 Part 1: Grease (Kitchen Extract)

Part 1 of NAAD21 is the section directly relevant to commercial kitchen operators. It specifies the requirements for a compliant kitchen extract clean, including:

• Cleaning frequency based on daily kitchen usage hours (see frequency table below)
• Pre-clean grease thickness measurement using the wet film thickness test — to record the baseline grease level before cleaning begins
• Cleaning of the full extract system: canopy, plenum chamber, full ductwork run to external discharge, fan and motor housing
• Post-clean grease thickness measurement — to confirm the system has been reduced to an acceptable grease level
• Photographic evidence taken before and after cleaning at specified points in the system
• A post-clean certificate of compliance including the contractor's identification, accreditation details, cleaning date and recommended next service date

The wet film thickness test is one of the key distinctions of NAAD21-compliant documentation. Rather than a contractor's subjective assessment of cleanliness, it provides a measurable, repeatable verification that grease levels meet the required standard — making it particularly valuable as insurance evidence in the event of a fire claim investigation.

NAAD21 Part 2: Air (Indoor Air Quality)

Part 2 of NAAD21 covers indoor air quality for ventilation systems beyond kitchen extract — HVAC systems, general ventilation ductwork and similar installations. While less directly relevant to the day-to-day kitchen compliance concern for most Pembrokeshire food businesses, Part 2 is relevant for hospitality businesses with hotel room ventilation systems, complex building HVAC installations or non-kitchen air handling units.

For a Pembrokeshire hotel operator managing both kitchen extract systems and room ventilation, a NAADUK-certified contractor working to both NAAD21 Part 1 and Part 2 can provide comprehensive verification documentation across all building ventilation assets.

Cleaning Frequency Under NAAD21

NAAD21 bases cleaning frequency on the number of hours per day the kitchen is in active use — a more granular approach than TR/19's broad light/moderate/heavy classification. The four categories and their required cleaning frequencies are:

The daily hours approach is particularly relevant for Pembrokeshire's seasonal food businesses. A restaurant that operates 6–8 hours a day in winter (moderate use, 6-monthly cleaning) may run 14–16 hours a day through the July and August peak — tipping into the heavy-use category and requiring quarterly cleaning during that period. A NAADUK-certified contractor can assess the appropriate schedule for your specific operation and document the classification clearly.

How Insurers Reference NAAD21

UK commercial property insurers — particularly those specialising in hospitality and catering risks — are increasingly referencing NAAD21 alongside TR/19 as the standard against which kitchen extract maintenance is assessed. This matters for Pembrokeshire food businesses in three practical ways.

Fire claim investigations: Following a kitchen fire, a loss adjuster will review your cleaning records. Documentation produced to NAAD21 standards — with wet film thickness measurements, photographic evidence and a compliant completion certificate — provides a far stronger evidence base than a basic invoice or simple cleaning receipt. Without compliant records, an insurer has grounds to argue that the maintenance condition of the policy was not met, potentially challenging or reducing the claim.

Policy conditions: Some commercial kitchen insurance policies now explicitly name NAAD21 alongside TR/19 in their maintenance conditions. Even where the policy wording does not name NAAD21 specifically, a general requirement to "maintain extraction systems in accordance with recognised industry standards" encompasses both documents.

Renewal and underwriting: As NAAD21 becomes more widely recognised, insurers at renewal may ask for NAAD21-referenced documentation specifically. Having a cleaning programme that already produces compliant records simplifies the renewal process and avoids last-minute gaps in your compliance history.

What a NAAD21-Compliant Clean Includes

A kitchen extract clean that meets NAAD21 Part 1 requirements will include all of the following elements. If any of these are missing, the clean does not fully meet the NAAD21 standard:

• Pre-clean grease thickness measurement (wet film thickness test) at defined points along the system
• Full system access — canopy, plenum chamber, complete ductwork run to external discharge, fan housing and discharge terminal
• Cleaning to specification using appropriate methods and chemicals for the grease type and surface
• Post-clean grease thickness measurement confirming the system meets the required standard
• Photographic evidence of the system condition before and after cleaning
• Certificate of compliance issued by the contractor, including the date, scope of work and contractor details
• Contractor identification and NAADUK membership or equivalent accreditation reference
• Recommended next service date based on your daily usage hours and NAAD21 frequency category

A cleaning job that only covers the visible canopy surfaces and produces a receipt is not a NAAD21-compliant clean. The full extract pathway must be accessed and the documentation must meet the specification above to constitute valid compliance evidence.

NAAD21 for Pembrokeshire Kitchens

The NAAD21 framework applies to the full range of commercial kitchen types operating across Pembrokeshire and West Wales. Understanding which usage category applies to your business — and how that may shift seasonally — is the foundation of a compliant cleaning programme.

Restaurants: Most Pembrokeshire restaurant kitchens operate in the moderate-use category during quieter months, requiring 6-monthly cleaning. During the summer tourism peak, extended service hours frequently push operations into the heavy-use category, warranting quarterly cleaning during that period. A Tenby restaurant running two full sittings plus bar food from 11am to midnight in August is clearly a heavy-use kitchen — regardless of its winter operating pattern.

Pubs and bars: Pembrokeshire pub kitchens vary significantly by location and season. A quiet community pub kitchen operating lunch and dinner service over 8 hours falls within moderate use. A coastal gastropub running extended hours from Easter through September — with kitchen open from noon to 10pm and prep beginning at 9am — is operating in the 12-hour-plus range and should be assessed against the heavy-use frequency requirement.

Hotels: Hotel kitchens in Pembrokeshire often operate breakfast and dinner service across extended hours, with full occupancy during the summer season. A hotel kitchen serving full breakfasts from 7am and dinners until 9pm at peak summer is running well over 12 active cooking hours per day — heavy use under NAAD21 — requiring quarterly cleaning during that period.

Holiday parks and seasonal operations: The substantial holiday park sector around Tenby, Saundersfoot and across Pembrokeshire runs catering operations that shift from negligible use in winter to continuous high-volume catering in summer. NAAD21-compliant documentation across the operating season provides robust verification for insurance purposes. Where operations genuinely close for winter, the pre-season clean should address the prior season's accumulation and establish a clean baseline for the new season.

Care homes operate year-round with consistent cooking loads — typically in the moderate-use category, requiring 6-monthly cleaning to meet NAAD21 requirements. Compliant documentation also supports CQC inspection requirements for kitchen safety management.

Other Relevant Standards

NAAD21 and TR/19 sit within a wider framework of standards relevant to commercial kitchen extract system management. Being aware of all applicable standards helps ensure your compliance records are complete:

• BESA TR/19 Grease

  The primary industry standard for kitchen extract fire risk management, published by BESA. Works alongside NAAD21 — both should be referenced in compliance documentation.

• Loss Prevention Standard 2084 (FM Global)

  A fire safety standard from FM Global covering loss prevention requirements for commercial kitchen extract systems. Relevant for food businesses with FM Global insurance cover or high-value properties.

• BESA DW172

  BESA's specification for kitchen ventilation systems — covering the design, installation and commissioning of kitchen extract systems. Sets the benchmark for system quality that cleaning and maintenance must maintain.

• EC852:2004 (Food Hygiene Regulation)

  European food hygiene legislation requiring food business operators to maintain premises in a clean condition. Environmental health officers may reference this when reviewing kitchen maintenance records during a food hygiene inspection.

• Building Safety Act 2022

  UK primary legislation introducing a new building safety regime, with particular focus on higher-risk buildings. For multi-storey buildings housing commercial kitchens, extract system maintenance intersects with the Act's requirements for documented building safety management.

Frequently Asked Questions — NAAD21