Keeping conductive dust out of the electrical systems of your transformer vault is critical. Arc flashing can cause a fire and/or explosion, shutting down the whole operation of a melting process. A 30,000-volt transformer can cost multiple millions of dollars to replace. It must be protected from heavy particulate.
HVAC systems alone are inadequate to protect equipment in transformer vaults. Air conditioning keeps the heat out of the room, but not the dust. Most steel mills try to cool and pressurize a vault with just an HVAC system. They pull outside ambient air into the room, filtering it with MERV 12 or 14 filters, sometimes MERV 8. Dust is able to go right through those filters.
Further, there is no pressurization in the room by just producing airflow through it with an HVAC system. The common practice is to mitigate the heat load from the equipment by releasing it through a louver on the opposite side of the room. The misconception is that this also creates a positive pressure to keep dust from blowing in through opened doors.
Conversely, the SMAC nanofiber filter captures all the particles with an efficiency of 0.5 micron and larger. We design the system to keep enough pressure in the room so that a sufficient amount of air flows out an open door to keep dust and contaminants out. So, we’re pressurizing the room with clean, filtered air using SMAC technology rather than the old, inadequate way with just an HVAC system.
An HVAC system alone reduces the longevity of transformer vault equipment. HVAC filters cannot handle the heavy dust loading and particle sizes like a SMAC filter system can. Weekly HVAC filter replacement stops with both systems working together.