Air admittance valves must not be used: where there is a backflow, the connecting branch, which is connected to a standpipe in higher than the third floor in a sewer leading from domestic sewage, in situations where it is possible only horizontal or inclined position valves .
To protect against freezing to -20 °C is used when mounting the top cover of polystyrene. Airflow 8 liters/s.
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