Aeroplane Hangar Ventilation
Aeroplane Hangar Ventilation
(OP)
Hi
wehere can I find guidelines on the design of ventilation system on aeroplane hangars, (how to maintane the hangar under positive pressure etc...)?
wehere can I find guidelines on the design of ventilation system on aeroplane hangars, (how to maintane the hangar under positive pressure etc...)?





RE: Aeroplane Hangar Ventilation
RE: Aeroplane Hangar Ventilation
The positive pressure is to prevent the ingress of dust..
RE: Aeroplane Hangar Ventilation
RE: Aeroplane Hangar Ventilation
RE: Aeroplane Hangar Ventilation
Negative pressure ventilation (reads E-X-H-A-U-S-T) is fundamental for contaminant dilution. That is true regardless of whether you are designing an aircraft hangar, an automobile garage, a chemical/biological laboratory, or a food kitchen.
It is true that positive pressure is best for preventing the introduction of external contaminants. However, in the case of potentially fueled aircraft (even recently de-fueled ones) your HVAC'd item is the contaminant source.
Failure to address this properly can be lethal.
RE: Aeroplane Hangar Ventilation
You require the space to be negative but you can control the make-up air through a filtered make-up unit to reduce the possibility of dust contamination.
RE: Aeroplane Hangar Ventilation
RE: Aeroplane Hangar Ventilation
* 300,000 0.5 Micron particle count,
* 80 deg. F., 50% RH max,
* 2-stage filtration: 50-60% rough filter followed by 80-85% final filter, and
* minimum 10 air changes per hour.
They also include positive pressure in that list, but as noted, that should be an exception. This comes from USAF "T.O. 00-25-203, Contamination Control of Aerospace Facilities, U.S. Air Force", which was revised 3/85. My copy is most certainly out of date, but I doubt that the particular items we're discussing have changed that much.
Obviously, "Clean Room" as we normally think of it (such as in laboratories and semi-conductor production) involves drastically more complicated measures.