Having opened the vent pipe valve and relieved the pressure, open the valve in the water filling tube.
No sheet metal, brick, or other flue shall be used as a vent pipe.
In one instance the vent pipe as designed was fitted with a screw plug at the end.
The lower part of the T acts as and connects with the waste pipe while the upper half is and connects with the vent pipe.
No vent pipe from the house side of any trap shall connect with the ventilation pipe or with sewer, soil or waste pipe.
The ice room should be ventilated by means of a vent pipe up through the roof to the open.