Thinking about installing a mini split yourself? With pre-charged R-454B...

https://online-wiki.win/index.php/What_is_a_Concealed_Duct_Mini_Split_and_When_Does_It_Make_Sense%3F

Thinking about installing a mini split yourself? With pre-charged R-454B quick-connect linesets, you can skip the vacuum pump and don’t need an EPA Section 608 license. Plus, 9K and 12K units offer easy 115V plug-in options