With the series tied at two games apiece, the winner of Saturday’s Game 5 will advance to the second round of the 2013 Calder Cup Playoffs.
Grand Rapids scored first as Luke Glendening converted on a shorthanded breakaway at 4:44 of the first period.
Houston tied the game on Granlund’s power-play goal at 12:24, and took the lead for good when Rau scored his first goal of the series in the final minute of the period.
Kampfer’s shot from the point at 10:35 of the second period gave the Aeros their second power-play goal of the game and a 3-1 lead, and McIntyre found the empty net with 2:05 left in regulation for the final margin.
Condon stopped all 18 shots he faced in the third period as the Griffins outshot the Aeros 18-4 over the final 20 minutes.
Petr Mrazek denied 15 of 18 shots in the game for Grand Rapids.