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3 Posts
Hi,
Does anybody know if these will be essential in a purpose built concrete shelter?
I am making my own ventilation system using a centrifugal blower, carbon / HEPA filter box and external blast valves of some kind.
The only thing I'm not sure about is the overpressure valve inside the shelter.
I am having an external blast valve over the air intake to protect the system. There will be a 'hole' in the wall opposite to expel stale air. On the external side of this, there will be another blast valve and on the inside of this would I need an overpressure valve of some kind???
Pumping fresh air into a shelter constantly should create a positive pressure right? So this should force out the stale air right? BUT whilst being positive pressure, it should stop any nasty air from the outside coming in....... right?
Im a little confused.......
Any help would be appreciated.
Thanks
Does anybody know if these will be essential in a purpose built concrete shelter?
I am making my own ventilation system using a centrifugal blower, carbon / HEPA filter box and external blast valves of some kind.
The only thing I'm not sure about is the overpressure valve inside the shelter.
I am having an external blast valve over the air intake to protect the system. There will be a 'hole' in the wall opposite to expel stale air. On the external side of this, there will be another blast valve and on the inside of this would I need an overpressure valve of some kind???
Pumping fresh air into a shelter constantly should create a positive pressure right? So this should force out the stale air right? BUT whilst being positive pressure, it should stop any nasty air from the outside coming in....... right?
Im a little confused.......
Any help would be appreciated.
Thanks