18/06/2026
The Door Vacuum Challenge Is the Nemesis of Fire Door Works!.
Just revisited a proiect today and got reminded of the one thing that can bring even the best fire-door setup to its knees door vacuum.
Two Buildings botn Listed. Original external doors (untouchable). Tiny lobby. FD30 internal doors that almost closed... but that last 10mm fought back like a champ.
Classic pressure differential.
The fix ended up being a proper little balancing act:
β’ Intumescent vent installed into the
internal lobby door
β’ Closer adiustments - one sped up, one slowed down
β’ Pressure finally equalised
β’ And now... the door actually closes like it's supposed to whichever way you go in or out.
Amazing how a tiny lobby and a sealed-up listed door can create a mini airlock,
Sometimes it's not the hinges, not the seals, not the closer, it's the building trying to hold its breath.
Just one more door Vacuum to sort out somewhere else now.