In this project, the General Silent Push Fit system by Poliran with the latest Coextrusion technology has been used in a three-layer structure. The outer layer is made of impact and mechanical resistant polypropylene, the middle layer is a sound absorber made of a special compound called Poliran EC, and the inner layer is made of smooth and polished polypropylene with minimal possibility of adhesion and resistance to high temperatures and various chemical substances:
 The performance of the General Silent Push Fit system against fire has been certified by the Research Center of Roads, Housing, and Urban Development and is compliant with the national standard of Iran (ISIRI8299-1) with E classification or higher. The system also reduces sound transmission.

    The performance of Pushfit General Silent system in reducing the amount of sound transmission:
The comfort of residents in a building, as the main place of daily life and work, is of great importance. One of the most important issues that should be considered in this regard is the problem of noise pollution. The sewage system of the building can also be a source of noise pollution; the movement of sewage flow in pipeline routes will create noise, which will be transmitted to the environment in two ways:
1- Airborne sound: a sound that is transmitted to the environment through the air. The quality and amount of absorption of the sound-absorbing materials used in the pipes and connections are very important to reduce it.
2- Structure-borne sound: a sound that spreads due to vibration or impact on a solid object. The fluid flow causes the pipes to vibrate, and the sound is transmitted to the environment as airborne sound through the building's structure. In order to minimize this sound, special elastic-coated fittings should be used.
    Reducing the transmission of sewage system noise to the environment is achieved by considering the following factors simultaneously:

1- Allocating suitable ducts for vertical pipes in the building architecture and insulating the ducts if adjacent to personal spaces such as bedrooms.
2- Proper design and engineering of the sewage and vent piping system with minimum complexity.

3- Proper installation and implementation of sewage transfer routes according to design and avoiding vertical pipes inside walls.
4- Choosing a suitable and noise-reducing sewage system.
5- Using special vibration-absorbing and noise-reducing fittings to control the sewage system.
Features:
-Maximum reduction of structure-borne sound transmission by using stable playeran fittings.
-Reducing airborne sound transmission by using special formulation in the middle layer.
-Reducing sound transmission in critical points of the system by using 45-degree elbow fittings and siphons with inspection windows.