Kitchen Extraction Cleaning Guide

A professional deep clean ensures that the entire system—from the visible filters to the hidden motor and ductwork—is free from combustible deposits. This guide outlines the costs, regulations, and technical requirements for maintaining a safe and efficient kitchen environment.

What Does the Work Involve?

• Full System Inspection: Checking the hood, internal housing, fan blades, and accessible ductwork for grease saturation.
• Component Removal: Dismantling grease filters, light covers, and centrifugal fans for deep cleaning.
• Dip-Tank Treatment: Soaking metal filters in specialist heated degreasing tanks to remove carbonised oil.
• Manual Degreasing: Hand-scraping and chemically treating the "plenum" (the space behind the filters) and the internal canopy.
• Ductwork Cleaning: Using rotary brushes or vacuum systems to clear grease from the extraction pipe leading to the external vent.
• Testing and Certification: Reassembling the unit and performing a smoke or airflow test to ensure peak performance.

Typical Costs

Prices are influenced primarily by the size of the extraction unit and the length of the ductwork. If your system hasn't been cleaned in several years, expect a "heavy soil" surcharge due to the extra labour and chemicals required.

How Long Does It Take?

• Standard Wall-Mounted Hood: 1.5 to 2 hours for a thorough internal and external clean.
• Island or Large Range Extractor: 2.5 to 4 hours, depending on the complexity of the motor housing.
• Systems with Extended Ducting: 4 to 6 hours if the technician needs to access ceiling voids or external roof vents.

DIY or Professional?

While homeowners can easily clean mesh filters in a dishwasher, professional intervention is required for the internal mechanical components. Professional cleaning is often a condition of UK buildings insurance, particularly for high-value properties or those with commercial-style ranges.

Specialist technicians use industrial-grade alkaline degreasers that are far more effective than supermarket sprays. Attempting to clean the fan motor yourself can lead to electrical shorts or balance issues if the blades are damaged during the process.

Choosing the Right Tradesperson

• Check Memberships: Look for technicians accredited by NAAD UK (National Association of Air Duct Specialists) or BESA (Building Engineering Services Association).
• Insurance Compliance: Ensure they provide a post-clean report or certificate that meets TR19® Grease standards.
• Avoid "Surface-Only" Cleaners: Be wary of cheap quotes that only cover the visible filters and ignore the ductwork and motor.
• Questions to Ask:
  • "Do you provide a certificate of cleanliness for my insurance provider?"
  • "Will you be cleaning the entire length of the ducting or just the hood?"
  • "What chemicals do you use, and are they safe for my specific finish (e.g., stainless steel or copper)?"

UK Regulations

While domestic kitchens aren't as strictly regulated as commercial ones, several standards apply to the equipment and safety protocols:

• TR19® Grease: The industry standard for fire safety and cleanliness in extraction systems.
• Regulatory Reform (Fire Safety) Order 2005: Homeowners have a duty of care to reduce fire risks, which includes maintaining extraction systems.
• Part P (Electrical Safety): Any repairs to the extractor motor or wiring must be carried out by a competent person.
• Insurance Requirements: Many UK insurers now specify that extraction systems must be professionally cleaned every 6-12 months to maintain fire cover.

Pro Tip: Always keep the digital or physical certificate provided by your cleaner. In the event of a kitchen fire, this is the first document your insurance loss adjuster will ask to see.

Common Problems

• Grease Seepage: Oil dripping from the hood onto the hob, usually caused by saturated filters or a full grease collection tray.
• Excessive Noise: A loud vibrating sound often indicates grease build-up on the fan blades, throwing the motor out of balance.
• Lingering Odours: If cooking smells remain hours after use, the ductwork is likely restricted or the carbon filters (in recirculating models) are spent.
• Reduced Suction: A "fluttering" or weak extraction usually means a blockage in the external vent or a heavily fouled motor.

Frequently Asked Questions

How often should I have my extractor professionally cleaned?

For most UK households, an annual professional clean is sufficient. However, if you use a deep-fat fryer or cook with heavy oils daily, every 6 months is recommended to prevent fire risks.

Can I just put my metal filters in the dishwasher?

Yes, most aluminium or stainless steel mesh filters are dishwasher safe. However, this only cleans the surface; it does not address the grease trapped inside the motor or the ducting behind the unit.

Will professional cleaning remove the "sticky" feeling on the outside of the hood?

Absolutely. Professionals use non-abrasive, industrial degreasers that break down the polymerised grease film that domestic cleaners often struggle to remove without scratching the metal.

Does a clean extractor really reduce energy bills?

Yes. When the fan blades and filters are clear, the motor doesn't have to work as hard to move air. This reduces electricity consumption and prevents the motor from overheating and burning out prematurely.

What is the difference between a recirculating and an extraction hood?

Extraction hoods vent air outside via a pipe; these need duct cleaning. Recirculating hoods pass air through carbon filters and back into the room; these require regular filter replacements rather than duct maintenance.