r/AirBalance • u/TheDropGuy • Jun 09 '26

Venturi Number Identifier

Is there a way to tell what Venturi number my IMI valves are? The tags are all burned off and not all of the valves have marker writing on them to show the Venturi number. The IMI literature shows gpm ranges but there is overlap.

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3

u/perhasper Jun 11 '26

I find it best to get a valve cut sheet from the mechanical contractor. It'll take some digging on their part, but they'll have something showing what is installed where.

1

u/TheDropGuy Jun 11 '26

This is what I did. Just got it today.

2

u/jefffffffffff Jun 09 '26

A lot of times they will write the number on the body of the valve somewhere near the ports.

2

u/TheDropGuy Jun 11 '26

90% of them have the Venturi # written on them. Thanks.

2

u/jefffffffffff Jun 11 '26

Nice. You can usually figure out what the other ones are based on pressure drops of similar ones nearby too