The value of sound resistance refers to noise suppression by this value. E.g. a regular dishwasher in the household has the noise value of 43dB. A door with the resistance of 33dB transmits the noise of only 10dB to another room.
In such a case it is worthwhile to replace the door and reduce heating costs of your household.
No, they are not. If you choose a SAPELI safety door of RC3 class as the entrance door, you will partially replace their function.
taught us to make really good doors
know SAPELI, but our home is in the Czech Republic
All of them custom made
tested lifetime of our doors and components