Jun 26, 2026Services Overview
PET Felt Acoustic Panel Thickness Guide: 9mm vs 12mm vs 15mm
This guide helps project managers and designers select the right thickness based on real commercial applications.
PET Felt Acoustic Panel Thickness Guide: 9mm vs 12mm vs 15mm
Introduction
Many clients ask:
“Which thickness is best?”
There is no universal answer.
Thickness changes performance, cost, and installation method.
Understanding how PET felt panels work helps avoid over-specifying or under-specifying.
How Thickness Affects Acoustic Performance
PET felt panels are porous absorbers.
They absorb sound when air vibration enters the fiber structure.
General rule:
- Thicker panel = better low-mid frequency absorption
- Air cavity behind panel improves performance significantly
Typical comparison:
Thickness | Best For | Notes |
|---|---|---|
9mm | Light echo control | Cost-efficient |
12mm | Standard office projects | Balanced performance |
15mm+ | Large spaces / higher RT control | Best with air gap |
Important:
Without cavity, performance improvement is limited.
For deeper explanation about absorption vs insulation, see our main article on PET felt acoustic panels and soundproofing.
Real Application Example
In one co-working project (300㎡):
- 9mm panels → RT still 1.0s
- Switched to 12mm + 30mm cavity → RT reduced to 0.7s
Thickness alone was not the only factor.
Installation method matters.
Recommendation
If you are unsure:
- Small meeting room → 9mm or 12mm
- Open office → 12mm + cavity
- Large lobby → 15mm + suspension system
Which PET Felt Panel Thickness Should You Choose?
“Not sure which thickness fits your project? Contact us or read our full guide to make the right decision.”
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