Meeting room curtain: video conferencing privacy and acoustics
A meeting room curtain meets two distinct acoustic requirements: controlling internal reverberation for video conferencing audio quality, and blocking external leaks for GDPR confidentiality of exchanges. Depending on the fabric composition and surface coverage, the measured sound attenuation varies from 8 to 22 dB between the inside and outside of the room. The typical configuration covers 1.5 to 2 times the width of the bay, from ceiling to floor, in a dense multi-layer fabric.
A closed meeting room does not have the same acoustic physics as an open space. In an open space, noise propagates directly between workstations; acoustic treatment aims to absorb and break this propagation. In a closed room, noise bounces off walls (internal reverberation) and leaks through windows and doors (external transmission). Both phenomena coexist and require different responses.
This article specifically addresses the closed meeting room. For open spaces, see our open space acoustic curtain guide. For fabric fundamentals and M1 certification on professional fabric, read the article fire-retardant fabric: materials and choices by use.
Why equip a meeting room with acoustic curtains?
Four issues justify the investment, which accumulate in the majority of modern configurations.
- Audio quality in videoconferencing. The tabletop microphone or video conferencing bar picks up direct speech and multiple reflections on hard surfaces (windows, smooth walls, ceiling). This reverberation produces a sound that is difficult for the distant caller to understand. A sufficient amount of absorbent fabric divides the room's reverberation time by 2 to 3.
- GDPR confidentiality and professional secrecy. A voice that goes out into the hallway or into the next room constitutes a leak of personal data or strategic information. The CNIL explicitly recommends, in its guides on physical data security, to guarantee the acoustic insulation of spaces where sensitive information is processed.
- Comfort and audio fatigue of participants. A reverberant room extends meetings by 15 to 25% in perceived time and increases the cognitive fatigue of participants. The INRS documents the effects of uncontrolled noise on occupational health.
- Blackout for projection. A room equipped with a video projector or a large screen requires controlled darkness in broad daylight. A combined blackout + acoustic curtain meets both uses with a single product.
The acoustic challenge of a closed room
Two distinct physical phenomena coexist in a meeting room. Understanding the difference allows for calibrating the response.
| Phenomenon | Mechanism | Appropriate response |
|---|---|---|
| Internal reverberation | The sound wave bounces off hard surfaces before reaching the ear or microphone. Reverberation time (RT60) measures the decay. | Sufficient absorbent surfaces (curtains, acoustic panels, ceiling tiles, carpet). |
| External transmission | The sound wave passes through the wall (window, light wall, door) and reaches the adjacent space. | Fabric density (mass law), continuity of coverage, sealing against lateral leaks. |
The French standard NF S 31-080 classifies offices by target RT60. A "standard" office aims for an RT60 less than 0.5 seconds, a "high-performance" office less than 0.4 seconds. For a meeting room equipped with video conferencing, aiming for 0.3 to 0.4 seconds is good professional practice.
Audio confidentiality in video conferencing
The widespread use of video conferencing tools (Teams, Zoom, Meet, Webex) has transformed every equipped meeting room into an audio processing zone. Three confidentiality risks accumulate.
- Leak to the outside of the room. A meeting voice exceeding 50 to 60 dB inside comes out into the corridor at 30 to 40 dB through a standard door, a level perfectly intelligible to a third party in immediate proximity.
- Capture by uncontrolled microphone. The video conferencing bar captures all the audio in the room, including side conversations or comments not intended for the distant interlocutor.
- Leak to the next room. If two rooms share a light partition or a window, a legal meeting on one side can be audible on the commercial side.
The stakes are not just about comfort: a documented breach of confidentiality during a GDPR audit or a dispute can lead to legal consequences. The presence of acoustic curtains on windows and glass partitions mitigates all these risks simultaneously.
Curtain performance adapted to meeting rooms
Four levels of acoustic performance correspond to four levels of use in a meeting room.
| Usage | Target attenuation | Recommended configuration |
|---|---|---|
| Standard meeting room without video conferencing | 8 to 12 dB | Dense single-layer curtain covering 1.5 times the bay width |
| Room equipped for occasional video conferencing | 12 to 18 dB | Two-layer absorbent + blackout curtain, 1.8 times coverage |
| Room dedicated to permanent video conferencing | 15 to 22 dB | Multi-layer curtain with acoustic mass, 2 times coverage |
| Confidential room (HR, legal, management) | 18 to 22 dB | Maximum multi-layer curtain, from ceiling to floor, on all glass surfaces including internal partitions |
The values presented correspond to achievable capacities depending on the chosen configuration. The effective attenuation depends on the frequency (low frequencies are always more difficult to block), the fabric weight, and the continuity of coverage (a lateral or top defect can divide the performance by 2 to 3).
Typical configuration of a meeting room curtain
Five parameters dimension a B2B meeting room curtain.
- Width. Count 1.5 to 2 times the width of the bay to ensure coverage without excessive tension and an absorbent drapery effect. Coverage just the width of the bay closes visually but loses 20 to 30% of the possible attenuation.
- Height. Ideally from ceiling to floor, extending 5 to 10 cm at the bottom to seal the contact with the floor. A curtain that stops above the floor allows measurable acoustic leakage.
- Fabric. Dense multi-layer with acoustic mass for confidential and permanent video conferencing uses. Dense single-layer is sufficient for standard rooms.
- Colors. Neutral corporate (grey, chart blue, forest green, taupe) for consistency with the company's visual identity. The customizable palette allows alignment with the organization's graphic charter.
- Attachment. Robust curtain rod compatible with a heavy curtain (multi-layer weighing 4 to 6 kg per panel), minimum 28 mm diameter. Eyelets or gathering tape according to aesthetic preference.
Specific use cases in meeting rooms
Room equipped for permanent video conferencing (war room, dedicated Teams room)
Multi-layer configuration with 15 to 22 dB attenuation and 100% blackout to neutralize backlighting on the video image. Covers 2 times the bay width. Dark colored fabric preferred for absorbing parasitic reflections on screens.
Training room and internal amphitheater
Combined blackout + acoustic for daytime projection and sound quality during training sessions. 12 to 18 dB attenuation is sufficient. Height often greater than 270 cm in internal amphitheaters, to be validated by on-site measurement.
Shared coworking space
Intermediate configuration between dedicated room and open space. 10 to 15 dB attenuation targeted to limit nuisance to neighboring common areas. Industrially washable fabric given user rotation and hygiene needs. Light colors for a shared bright atmosphere.
Video booth (phone booth) in open space
Closed cabin for 1 to 2 people used for calls in open spaces. Compact configuration with multi-layer interior curtain, ceiling-to-floor height, 18 to 22 dB attenuation to block leakage to the surrounding open space. A complementary solution to a commercial acoustic enclosure.
Curtain surface area and absorption rule
The acoustic absorption effect of a curtain depends on its total surface area relative to the room's volume. The practical rule for acoustic design offices is as follows.
- Minimum recommended absorbent surface area: 30 to 40% of the room's floor area.
- For a 30 m² room, aim for 9 to 12 m² of absorbent surface (curtains + panels + ceiling tiles).
- A curtain 4 meters wide by 3 meters high covers 12 m². On its own, it can reach the target for a 30 m² room.
- Beyond 50 m² of room space, a combination of curtains + acoustic panels + ceiling tiles is preferable to the curtain-only solution.
ROI productivity and confidentiality
The investment in an acoustic meeting room curtain is justified by three economic flows.
- Productivity gain in video conferencing. An intelligible meeting takes 15 to 25% less time than a noisy meeting. Over 200 meetings per year per dedicated room, the cumulative gain represents several tens of hours.
- Reduced risk of leakage. The cost of a confidential leak (GDPR audit, commercial litigation, loss of market) far exceeds the initial investment in a correctly sized acoustic curtain.
- Improved participant comfort. Audio fatigue in meetings is a documented factor in decreased attention, absenteeism, and turnover among profiles sensitive to the work environment.
For a typical initial budget of €2,000 to €6,000 excl. VAT for an equipped meeting room, the return on investment is generally observed within the first year of use through productivity gains alone.
How Kurtens manufactures a meeting room curtain
Kurtens designs its technical curtains according to the project's specifications. Production capabilities allow combining on the same curtain acoustic attenuation measured up to 22 dB, 100% blackout for projection, and thermal insulation measured up to 7°C gain depending on the chosen configuration. M1 certification is available upon request for public access buildings (ERP type W) classified by the safety commission.
The dedicated B2B team provides a quote within 24 hours, transmits the technical sheet and test reports on request, and offers a color and material sample to validate consistency with the organization's graphic charter. No minimum order is imposed. To start a project, see the custom office curtains page or request a B2B quote.
Frequently asked questions about meeting room curtains
Is M1 classification required in a meeting room?
For the majority of private offices and meeting rooms (ERP type W), articles AM 11 to AM 13 require M2 classification for premises over 50 m² and for circulation areas. M1 is reserved for enclosed staircases and stages. For a room that accommodates external public or that may be inspected by a safety commission, M2 classification is the prudent standard. Final validation depends on the configuration and the control office. See the M1/M2 guide and ERP regulations.
Do curtains replace wall-mounted acoustic panels?
Not entirely, but they partially substitute for them with an often superior cost-performance ratio. For windows and glazed bays, the acoustic curtain is the only discreet solution. On solid walls, acoustic panels absorb more per square meter but are visible and not very flexible. The combination of curtains (on glazing) + panels (on walls) + ceiling tiles covers all situations.
What colors should be preferred in a meeting room?
Three color families dominate in B2B offices: corporate neutrals (pearl grey, anthracite, taupe), brand colors (blue, green, terracotta depending on visual identity), and wood or ecru for warm ambiances. The color has no impact on acoustic performance, which depends solely on the fabric composition and weight. Prefer dark colors in video conferencing rooms to limit parasitic reflections on screens.
How much curtain surface area for a 30 m² room?
Aim for 9 to 12 m² of total absorbent surface in the room, which is about 30 to 40% of the floor area. For a 30 m² room with a single bay 4 m wide by 3 m high, a curtain covering 1.8 times the width (i.e., 7.2 m of fabric in length) over the full height already reaches 21.6 m² of deployed fabric, well beyond the target. The complement is provided by ceiling tiles or a wall panel if necessary.
Does the curtain block voice leaks through doors?
No, the curtain placed in front of the window does not address leakage through the door. To neutralize leakage through doors, two complementary solutions: a door curtain (lambrequin with a drop to the floor) or weatherstripping on the existing door. For a standard unequipped door, up to 70% of a meeting room's acoustic leakage passes through the door. The curtain at the windows addresses leakage through the glazing, which represents the other 30%.
What is the difference between an open room and a closed room for acoustic treatment?
An open room (open space) requires primarily absorbent treatment to limit direct propagation between neighboring workstations. The curtain plays a partial barrier role, supplemented by panels and movable partitions. A closed room requires both internal absorbent treatment (reverberation) and an external transmission barrier (to the hallway or neighboring room). The closed room curtain must therefore be denser, taller, and wider than an open space curtain to achieve comparable attenuation.
Note: This article presents the technical principles applicable to acoustic meeting room curtains. It does not replace the study of a qualified acoustician for sensitive configurations (studios, measurement rooms, environments with very high requirements). The attenuation values presented are achievable production capacities, to be confirmed on the test report of the finished product according to the chosen configuration.
To start a meeting room equipment project: request a B2B quote. Response within 24 hours, volume discounts, M1 certification on request, color sample provided.
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