Thanks to the USCHO (good college hockey site)
Here are the NCAA’s guidelines on the matter, per a meeting of the Championship Committee:
In setting up the tournament, the committee begins with a list of priorities to ensure a successful tournament on all fronts including competitive equity, financial success and likelihood of playoff-type atmosphere at each regional site. For the model, the following is a basic set of priorities:
• The top four teams as ranked by the committee are the four No. 1 seeds and will be placed in the bracket so that if all four teams advance to the Men’s Frozen Four, the No. 1 seed will play the No. 4 seed and the No. 2 seed will play the No. 3 seed in the semifinals.
• Host institutions that qualify will be placed at home.
• No. 1 seeds are placed as close to home as possible in order of their ranking 1-4.
• Conference matchups in the first round are avoided, unless five or more teams from one conference are selected, then the integrity of the bracket will be preserved.
• Once the six automatic qualifiers and 10 at-large teams are selected, the next step is to develop four groups from the committee’s ranking of 1-16. The top four teams are the No. 1 seeds. The next four are targeted as No. 2 seeds. The next four are No. 3 seeds and the last four are No. 4 seeds. These groupings will be referred to as “bands.”