Here this should help you
Rule 48 – Illegal Check to the Head
48.1 Illegal Check to the Head – A hit resulting in contact with an
opponent’s head where the head was the main point of contact and
such contact to the head was avoidable is not permitted.
In determining whether contact with an opponent's head was
avoidable, the circumstances of the hit including the following shall be
considered:
(i) Whether the player attempted to hit squarely through the
opponent’s body and the head was not "picked" as a result of poor
timing, poor angle of approach, or unnecessary extension of the
body upward or outward.
(ii) Whether the opponent put himself in a vulnerable position by
assuming a posture that made head contact on an otherwise full
body check unavoidable.
(iii) Whether the opponent materially changed the position of his body
or head immediately prior to or simultaneously with the hit in a way
that significantly contributed to the head contact.
48.2 Minor Penalty – For violation of this rule, a minor penalty shall be
assessed.
48.3 Major Penalty – There is no provision for a major penalty for this rule
48.4 Game Misconduct Penalty – There is no provision for a game
misconduct for this rule.
48.5 Match Penalty – The Referee, at his discretion, may assess a match
penalty if, in his judgment, the player attempted to or deliberately
injured his opponent with an illegal check to the head.
If deemed appropriate, supplementary discipline can be applied by
the Commissioner at his discretion.