{"id":9391,"date":"2026-04-15T09:00:54","date_gmt":"2026-04-15T07:00:54","guid":{"rendered":"https:\/\/www.marquis.rs\/en\/?p=9391"},"modified":"2026-04-15T07:33:01","modified_gmt":"2026-04-15T05:33:01","slug":"commercial-kitchen-exhaust-fire-risk","status":"publish","type":"post","link":"https:\/\/www.marquis.rs\/en\/blog\/commercial-kitchen-exhaust-fire-risk\/","title":{"rendered":"Commercial Kitchen Exhaust Ventilation: From Fire Risk to Safe Operation"},"content":{"rendered":"

Commercial Kitchen Exhaust Ventilation: From Fire Risk to Safe Operation<\/h2>\n

A little over a year ago, a restaurant that had been successfully operating for years on the ground floor of the Marquis Intelligence office building closed its doors. During the relocation, the commercial kitchen exhaust ventilation system, from the hood to the discharge point at the highest part of the building, was dismantled.<\/p>\n

The dismantled ventilation ducts, seen in front of the Marquis Intelligence building, looked alarming. Their inner surfaces were covered with thick layers of black, greasy deposits.<\/p>\n

This clearly demonstrates how an inadequately designed and maintained commercial kitchen exhaust system can pose a serious risk to the entire building.<\/p>\n

What Is Commercial Kitchen Exhaust Ventilation?<\/h2>\n

Commercial kitchen exhaust ventilation is a system designed to remove fumes, grease, odors, and heat from the kitchen and discharge them outdoors.<\/p>\n

It typically consists of a kitchen hood with filters, ventilation ducts, and a fan – and should also include air purification systems.<\/p>\n

In this particular kitchen, that last component was missing.<\/p>\n

Air in Commercial Kitchens<\/h2>\n

During daily operation, commercial kitchens generate a complex mixture of pollutants.<\/p>\n

Frying and grilling can produce up to 200 chemical compounds, primarily due to the breakdown of fats at high temperatures. These substances occur as aerosols, particles, and gases, including aldehydes and other compounds with significant toxic and carcinogenic potential.<\/p>\n

At the same time, exhaust air contains greasy particles, smoke, odors, and water vapor.<\/p>\n

What is the Role of a kitchen hood?<\/h2>\n

The kitchen hood is the first element of the exhaust ventilation system. Its function is to capture polluted air generated during food preparation.<\/p>\n

Typically, kitchen hoods include metal filters for coarse air filtration.<\/p>\n

From the hood, air is transported through ventilation ducts by a fan and discharged into the atmosphere.<\/p>\n

Is It Necessary to Purify Exhaust Air?<\/h2>\n

If the air from the kitchen hood is not properly treated, several problems arise:<\/p>\n

    \n
  1. accumulation of contaminants inside ducts and equipment<\/li>\n
  2. spreading of unpleasant odors around the discharge location<\/li>\n
  3. increased fire risk<\/li>\n
  4. reduced efficiency of the exhaust system<\/li>\n
  5. increased noise due to contaminated fans and reduced duct cross-sections<\/li>\n<\/ol>\n

    Are Grease Exhaust Ducts a Fire Hazard?<\/h2>\n

    Yes. Ventilation ducts where grease accumulates represent a significant fire risk.<\/p>\n

    Grease deposits are highly flammable. In case of fire, they allow rapid fire spread through the ventilation duct system.<\/p>\n

    In dense urban areas, such as central Belgrade, this risk is not limited to the kitchen – it can endanger the entire building and neighboring structures.<\/p>\n

    This is why the Marquis Intelligence team was concerned when they saw the dismantled ducts covered with thick, highly flammable deposits – especially since maintenance crews had regularly been seen servicing the system.<\/p>\n

    Reducing Fire Risk Through Proper Ventilation Design<\/h2>\n

    If a commercial kitchen exhaust system is properly designed and installed, includes air purification, and is regularly maintained, the risk can be reduced to a minimum.<\/p>\n

    Why Exhaust Alone Is Not Enough<\/h2>\n

    A common misconception is that a kitchen hood and basic exhaust system are sufficient.<\/p>\n

    However, without proper air treatment, the problem is not solved – it is simply relocated.<\/p>\n

    Untreated exhaust air can:<\/p>\n