What sound insulation material is better for hotel elevator shaft?

There are several types of sound insulation and sound absorption materials for hotel elevator shafts:

1. Nano-Al-Mg fireproof damping sound insulation felt belongs to inorganic environmental protection material, with fireproof grade A 1, effective fireproof and flame retardant, and weighted sound insulation ≥30DB.

2. Sound insulation cotton, similar to glass fiber needled felt, is also a commonly used sound absorption material for elevator shafts, which is inorganic, environmentally friendly and soft in texture.