1- individual vent 2- horizontal branch
3- relief vent
4 - loop vent
5- branch vent
6- circuit vent
A a vent that ends by connecting to a stack vent instead of a vent stack
B a vent that connects to between two and eight fixture traps
C a pipe that connects two or more fixture drains to the main portion of a system
D a vent that connects a fixture trap to another vent or ends in open air
E a vent that connects one or more individual vents with a stack
F a pipe that circulates air between a drainage and a vent system
вот короче я перевел ≧ω≦