Amico NFPA Triplex SCD Modular Stack Mount - Manual (Page 23)

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6.6 Medical Air System Inlet
Below is a summary of the requirements for the medical air system inlet locations.
1. Locate the medical air inlet in an area where there will not be potential hazards such as
contamination from engine exhausts, fuel storage vents; toxins or hazardous contaminants, such as
ethylene oxide (ETO) gas exhaust vents, medical vacuum exhaust vents, particulate matter or odor
of any type.
2. Locate the medical air inlet outdoors above the roof level a minimum distance of 10 ft. (3 m) from
any door, window, exhaust, other intake or opening in the building, and a minimum distance of
20 ft. (6.1 m) above the ground. Intakes shall be turned down and screened or otherwise be
protected against the entry of vermin or water, with screening that is to be fabricated from or
composed of non-corrosive material such as stainless steel or other suitable material.
3. If a source is available that is equal to or superior to outside air (For example, air already filtered for
use in the operating room ventilation systems), it shall be permitted to be used for the medical air
compressors. This alternative source of supply air must be available on a continuous 24-hours-a-day,
7-days-per-week basis. Ventilating systems having fans with motors or drive belts located in the air
stream shall not be utilized as a source of medical air intake.
4. Medical air intakes for separate compressors shall be permitted to be joined together to one
common intake, provided such intake is appropriately sized.
5. Figure 4 details the minimum inlet pipe sizing required based on the medical air system
horsepower, configuration, and the total pipe length (including elbows) in the medical air intake
line.
a. The medical air intakes are joined together to one common intake.
b. All pipe sizes are based on copper pipe Type L.
c. Minimum pipe size must be preserved for the total length of inlet pipe.
d. Use the next larger size pipe in the event the minimum size is not available.
e. When determining the Total Pipe Length (TPL), add all straight lengths of pipe together plus
the number of elbows multiplied by the effective pipe length for that pipe size.
(See Figure 4).
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