Yes, VENTILATIONS is a Scrabble word!

Letter values in Scrabble US: V 4, E 1, N 1, T 1, I 1, L 1, A 1, T 1, I 1, O 1, N 1, S 1.

Is it a valid word?

VENTILATIONS is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

the act of supplying fresh air and getting rid of foul air
a mechanical system in a building that provides fresh air
free and open discussion of (or debate on) some question of public interest
the bodily process of inhalation and exhalation; the process of taking in oxygen from inhaled air and releasing carbon dioxide by exhalation

Also: ventilation system, ventilating system, public discussion, external respiration.