What size tubing should be used?
This depends on the size of the building. 3/4″ tubing can be laid out in circuits up to 500′ long. 1/2 tubing should be kept to around 250’/circuit. Therefore if the building is large such as a shop or warehouse, 3/4″ tubing is used to save on manifolding and labor costs. In a smaller building or house 1/2″ tubing is typically used because of the smaller rooms or area to be covered.
