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What Causes Persistent Odour in Conference and Hospitality Rooms?

Written by The Ozofresh Team

Date Published: Tuesday May 26, 2026
Est. Reading: 5 minutes
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For conference centres, event venues, holiday parks and other hospitality businesses, persistent odour problems can, and usually will, affect first impressions, guest comfort, staff confidence and the perceived cleanliness of the venue.

At the risk of stating the obvious, the purpose of conference rooms, function suites, hotel lounges and hospitality spaces is to be used by large numbers of guests in a short space of time. That means heavy use and short turnaround times.

That is where odour problems can begin.

 

Why do conference rooms and hospitality venues develop persistent odours?

Persistent odours are an unwanted and not unexpected result of large hospitality spaces being used by many people for long periods. When you mix food, drink, movement, closed windows, heating, air conditioning and soft furnishings together, they will all contribute to the problem.

Then, when your next guests walk in, they smell the lingering odour from the last event and get the false impression that the room is not clean enough. You will know it isn’t that you didn’t clean the room after the last event, but that’s just what people will assume.

Cleaning doesn't fully remove them because odours can remain in the air, on surfaces, trapped in carpets, curtains, chairs, wall coverings and many other places. Food smells, stale air, body odours, alcohol, smoke particles and even perfumes can all build up over time.

In many venues, that means the issue is not one big dramatic smell that you can just spray away with chemicals. It is a gradual build-up of background odours that make a room feel stale, tired or poorly aired.

KEY POINT - Being clean doesn't always mean odour-free. A room can be perfectly turned and still retain a lingering odour.

 

Why does cleaning not always remove odours?

The issue is not with standard cleaning. That is there to target visible and settled dirt and dust, as well as spills, new stains and surface contamination. Persistent odours often sit deeper within fabrics, furnishings and enclosed spaces, though. That means sprays and perfumes may temporarily sort of partially mask the smell, but they do not remove the source. Our customers tell us they can even contribute to that ‘hotel smell’ guests instantly recognise.

The simple truth is that your housekeeping team are going in and doing a great job of cleaning the room... but that cleaning process is not designed to deal with the source of the lingering odours. It's designed to turn the room. Which is does.

That's why every GM, C&B manager, Housekeeping and front of house team member knows that you can clean thoroughly, but the odour returns.

For hospitality venues, that creates a real problem because guests pick up that background odour. They may not even know exactly why a room feels unpleasant. They simply notice that it does, or they smell a hint of something nasty from the last event… and the complaints and bad reviews start.

KEY POINT - Cleaning a room doesn't always address the odour problem. Not because there is anything wrong with the cleaning, but because it isn't practical to do so on a room turn. 

 

What are the most common odour problems in conference and hospitality spaces?

The most common odour problems in conference rooms and hospitality venues will include:

  • Stale air after long meetings or events
  • Food and drink smells after functions
  • What the page brought back after too much ice-cream or the over-indulging guest who didn’t quite make it outside when the alcohol came back up
  • Beer and wine spills after evening events
  • Smoke and cannabis smells carried in on clothing
  • Musty smells in rooms that are not used every day
  • Odours trapped in carpets, chairs and curtains
  • Poor air quality in older venues with enclosed spaces

These issues are particularly common in UK hospitality and conference locations during the wedding period, Christmas/New Year season, corporate events and peak summer holiday periods.

So, why does a large function suite, conference room, cinema room, entertainment space, bar area or communal lounge require a different approach than a smaller room? Well, practically speaking, there are two main contributing factors.

Firstly, these kinds of spaces will usually have higher ceilings, heavy furnishings, and limited ventilation, and secondly, they require a fast turnaround time between bookings.

KEY POINT - In short, it is the size of the space itself, and the way it is used, that means it is easier for the cause of odours to linger and hide.

That is where the Eclipse Pro MAX has been designed to help.

 

How does the Eclipse Pro MAX help remove persistent odours?

The Eclipse Pro MAX is a powerful ozone-based odour control system designed for larger spaces. It helps break down odours at source rather than simply covering them with fragrance.

For hospitality and conference venues, this means the Eclipse Pro MAX can be used as part of a planned room reset process. After the space has been cleaned and the room is vacant, the system can help tackle lingering odours. It will literally destroy the odour particles both in the air and within the wider room environment.

It is particularly suited to larger rooms such as:

  • Conference rooms
  • Function suites
  • Hotel communal spaces
  • Event rooms
  • Holiday park entertainment venues
  • Large lodges and caravans
  • Bars and hospitality areas
  • Cinema rooms, arcades and shared guest spaces

 

When should hospitality venues use the Eclipse Pro MAX?

Hospitality venues should consider using the Eclipse Pro MAX whenever a large room needs to feel fresh, clean and guest-ready in a short space of time.

For example:

a UK conference centre may use it after a full-day business event.

A hotel may use it over night or the morning after a wedding reception.

A holiday park may use it between events in a bar/theatre area.

In all the above, the Eclipse Pro MAX will be deployed in an empty, out of service, room and can be left to do its job. The room is on downtime anyway, so there is no disruption to the regular schedules. Housekeeping can also build it into the regular cleaning and maintenance routine, as well as using it to freshen a room, often within an hour at high pressure times.

KEY POINT - The benefit is control. Instead of waiting for complaints or trying to mask odours at the last minute, venues can take a more professional and proactive approach.

 

Why does odour control matter for guest experience?

In hospitality, we all know that first impressions matter. Guests, event organisers, delegates and visitors will make fast judgements (as we discuss here). A persistent odour will suggest poor cleaning, tired facilities or lack of attention to detail immediately.

A room full of fresh air feels cleaner, more comfortable and better managed, and that is important for the reviews, not to mention the possibility of a re-book.

 

Can Ozofresh demonstrate the Eclipse Pro MAX?

The Eclipse Pro MAX for large space odour issuesYes. For hospitality venues, conference centres and large-space operators, seeing the Eclipse Pro MAX in action is often the best way to understand what it can do.

A product demonstration allows you to see how the system works, where it can be used and how it could fit into your existing cleaning, maintenance or room turnaround process.

Drop us a line, and we will arrange it where possible.

 

Is the Eclipse Pro MAX right for your venue?

If your UK hospitality venue deals with stale air, lingering smells, food odours, smoke-related odours or large rooms that never quite feel fresh, the Eclipse Pro MAX is a practical long-term solution.

Whether it is right for your venue is down to the conditions, room size and other factors. So, let’s chat. We have a number of different UK-designed and built options, so one way or another, we can probably help if anything in this article resonated with you.

 

PS – Ozone will also help control bedbug eggs, norovirus, COVID, bacteria and fungal issues, as well as clear up odours after fire or flood disaster recovery… all with the same cost-effective machine. Call us and we will explain how.

Need more information?

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Watchman (Ozone) Limited is a company registered in England and Wales with company number 07694084
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