Chimney Works installed ENERVEX fans (a BEF560x Intake Fan and TDF 560 Exhaust fan). This was a retrofit for an office building where the boilers were being replaced. The intake fan was mounted inside to provide ample combustion air for the (3) Lochinvar Crest 6000 boilers. The TDF 560 fan was installed on the roof of the building to allow exhaust gases to expel high into the atmosphere to prevent it from being pulled back in by several outside air units on the rooftop nearby.