ECN Forum Forums General Topics of the Trade General Discussion Area 9 CFLs dims HVAC fan activity on same floor. No VD

Ballst used is not a dimable ballast. Harmonics is also what I thought. However, why would
1) the harmonics only be affecting fixtures on the same floor as the active HVAC fan?
2) the harmonics be affected by opening the door between the HVAC mechanical room and the hallway with the dimming light fixtures?