2 Maxx Air Drum Fans

2 fans ventilating a boiler room.

[@grovecitysirens_GCS]

Are they actually stackable? Also you should look for a *heat buster* fan, i saw one recently and it had a pretty impressive blade angle and the blades were atleast 11 or somthing inches wide, it was i think a 48 inch drum fan

[@user-mg9zo5zg7g]

Im wondering if you have any fans of your own.