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.

PET felt panels are porous absorbers.

They absorb sound when air vibration enters the fiber structure.

General rule:

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.

In one co-working project (300㎡):

Thickness alone was not the only factor.

Installation method matters.

If you are unsure:

“Not sure which thickness fits your project? Contact us or read our full guide to make the right decision.”