Dear all, How could we select FCU drain pipe as VRV, VRF, and Chiller System?

As per international plumbing code:

- Up to--tons ====>0.in

- From-to- ====>1in

- From-to- ====>1.in

- From-to- ====>1.5in

- From-to- ====>2in

it can be changed from country to another