amokduke 0 Report post Posted March 27, 2011 Hi, just want to ask, "What is the difference between the copper diameter for a 9k btu blower vs a 12k btu blower (Inverter)?" If I am not wrong, Liquid is 1/4 inch while gas is 3/8 inch for 12k btu? Thanks Share this post Link to post Share on other sites