It is difficult to call it felt. Very light, loose fabric, extremely low sound-absorbing properties. The room that they wanted to soundproof has a noise level of 45 dB. Outside the door, in the corridor, the noise was about 30 dB. After pasting the doors with this material, the noise level in the corridor decreased, according to measurements, by only 1.5-2 dB. Those. almost not at all ((
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