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Exhaust air purification in high-rise bistro – odor-free without roof ducting

oxytec plasma systems for modern kitchens without external chimneys

In high-rise buildings, shopping centers, or complex commercial properties, kitchen exhaust air poses a particular challenge: classic exhaust air ducting via the roof is often technically impossible or economically unfeasible. Nevertheless, users, neighbors, and authorities expect an odor-free and hygienic solution.

With plasma exhaust air purification from oxytec, this is exactly what is possible – without any roof ducting, activated carbon, or open flames. The purified air can be discharged odor-free into the building or at a low level. Approved, compact, and proven.

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Typical sources of emissions in the restaurant industry

 

Source Pollutants Special features
Cooking and frying areas Grease, odors, VOCs, smoke High organic pollution, locally concentrated
Deep fryers and grills Aerosols, oil vapors, thermally stressed air Very odorous, grease-laden
Washing and cleaning processes Humid air, cleaning chemicals Warm, humid, often underestimated
Food preparation Protein compounds, aromas, vapors Diffuse, but relevant to odors

Why use Oxytec plasma systems in high-rise kitchens?

Exhaust air purification without roof ducting – ideal for renovations and city centers

Plasma technology reliably removes grease, smoke, and odors

No use of activated carbon or thermal afterburning

Minimal space requirements – integration above the hood or in the ventilation duct

Exhaust in underground parking garage, courtyard, or sideways – approvable and proven

Legal requirements

TA Luft / VDI 2052 / VDI 3894

  • Technical reduction of odors, grease, and VOCs
  • No odor nuisance at the point of discharge
  • Proof of cleaning effect required

Fire protection / building regulations

  • No open flame → suitable for sensitive building areas
  • Meets fire protection class and grease separation requirements
  • Optional ATEX-free or fire protection-optimized design

Approval & verification

  • Plasma systems are eligible for approval as technical exhaust air treatment
  • Effect verifiable by VOC and odor measurement (DIN EN 13725)
  • Already recognized in many cities – e.g., as an alternative to roof ventilation

Are you planning a high-rise bistro? We have the right solution.

Whether you are renovating, refurbishing, or building from scratch, oxytec plasma systems eliminate the need for complex exhaust air ducts and ensure clean, odor-free operation.

Get a no-obligation consultation now—together we will find the emission-free solution for your kitchen.

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oxytec technologies in use

Plasma exhaust air purification

Oxidizes organic odors, fats, and VOCs in real time

Neutralizes odors without flames or chemicals

No residue—no additional filter consumption

Low maintenance, long service life

Cleanable electrodes, compact installation

Pre-separator & aerosol filter (optional)

Removes coarse dust and grease droplets before they reach the plasma module

Protects the plasma unit and ventilation ducts

Stainless steel components – HACCP-compliant, washable

Odorless blow-out

Exhaust air can be returned to the building or discharged at a low level.

No chimney required – odorless operation even in parking decks, inner courtyards, or side shafts.

Verifiable by olfactometry or VOC measurement.

Typical areas of application

High-rise restaurants, rooftop bistros, sky bars

Food courts in shopping malls or airports

Bistros in hotels, train stations, office buildings

Catering kitchens without vertical exhaust air ducts

Retrofitting in existing kitchen spaces

Your advantages with Oxytec plasma solutions

No roof ducting required – ideal for complex building structures

Odorless, grease-free exhaust air thanks to proven plasma technology

Compact, quiet systems for integration in the kitchen area

Low maintenance – no filter replacement as with activated carbon

Approval-compatible even in sensitive inner-city locations

FAQ – Frequently Asked Questions

How does exhaust air purification work without a roof duct?

The purified exhaust air is not vented upwards via the roof, but rather via, for example:

  • side facade openings
  • Technical shafts or false ceilings
  • Parking decks, atriums, or underground garages

Thanks to plasma technology, the exhaust air is odorless and grease-free after cleaning and can be discharged at a low height—without causing any nuisance or health hazards.

What exactly happens during plasma exhaust air purification?
  • In the plasma field, fat molecules, odors, and VOCs are destroyed by oxidative processes
  • This produces non-toxic, odorless decomposition products such as CO₂ and water
  • The technology works without an open flame, without activated carbon, and without chemicals
  • The cleaning effect is continuous and measurable

Does the system meet the requirements of VDI 2052 or TA Luft?

Yes. The systems are designed to:

  • Neutralize odors (according to VDI 3894 and DIN EN 13725)
  • Significantly reduce grease and aerosol content
  • Reduce VOC emissions to an approvable level

The cleaning performance can be documented by odor reports or VOC measurements upon request.

How complex is the maintenance of plasma systems?
  • The plasma unit is low-maintenance, with long electrode service life
  • No consumables such as activated carbon are required
  • The units can be cleaned (e.g., manually or using rinsing programs)
  • Optional remote monitoring and maintenance contract from oxytec

What are the requirements for fire protection?
  • The systems operate without flames → no thermal afterburning
  • Metal components, available in stainless steel on request
  • Also suitable for fire protection classes A–C
  • ATEX-free version for grease/solvent vapors available on request

How loud is the system?

The plasma unit itself operates almost silently.
Noise is only generated by the air flow, i.e. by the fans. Oxytec can also provide soundproofed solutions – ideal for neighbors or adjacent rooms.

What distinguishes this solution from activated carbon or TNV systems?

 

oxytec Plasma Activated carbon TNV (post-combustion)
No consumables Regular replacement, high follow-up costs High energy consumption and space requirements
Compact & modular Large filter areas required Large clearance areas & fire safety requirements
Flame-free & quiet Odorless, but not grease-free Hot, maintenance-intensive, high CO₂ emissions

What funding opportunities are available for such systems?

Funding is available through:

  • BAFA Module 4 – for energy-efficient ventilation and exhaust air technology
  • State programs for inner-city use or restaurant renovations
  • GEG-compliant heat recovery (with additional systems)

We would be happy to advise you on the eligibility of your specific situation.