A SECRET WEAPON FOR VFD PANEL

If a staircase or raise foyer is in excess of-pressurized, the tension reduction damper will open up to lessen the pressure. Having said that, In case the staircase or lift foyer is beneath pressurized, there's no countermeasure. Click here for more info about VFD panelAn electrolytic capacitor is included for the DC bus to filter undesired AC freq