Amico NFPA Triplex RVL Modular Stack Mount - Manual (Page 21)

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Note:
The location and number of vacuum terminal units in a system must be determined by consultation with the
medical and hospital staff having knowledge of the requirements for and the utilization of vacuum in each space or
patient location. Often individual state requirements will dictate specific numbers and locations for vacuum outlets.
The usage factor is a function of the anticipated procedure(s) and apparatus which could be encountered
simultaneously and may vary from one facility to another.
* see NFPA 99 Standard
7.6 Medical Vacuum System Exhaust
Below is a summary of the requirements for the medical vacuum system exhaust locations.
1. Locate the medical vacuum exhaust outdoors in a manner that will minimize the hazards of noise and
contamination to the hospital and its environment. The exhaust shall be located remote from any door,
window, air intake, or other openings in buildings with particular attention given to separate levels of intake
and discharge. Care shall also be exercised to avoid discharge locations contraindicated by prevailing winds,
adjacent buildings, topography, and other influences. Outdoor exhausts shall be protected against entry of
insects, vermin, debris, or precipitation. Exhaust lines shall be sized to minimize back pressure. Discharge
piping shall be free of dips or loops that might trap condensate or oil. If such discharge piping is unavoid
able, a trapping drip leg shall be installed to keep the piping free of fluid buildup. The exhaust
shall be located at least 30 ft (10 m) from any door or operable window, 50 ft (15 m) from any mechanical air
intake, and a minimum of 10 ft (3 m) above grade.
2. Medical vacuum exhausts for separate pumps shall be permitted to be joined together to one common
exhaust, provided such intake is appropriately sized.
3. Discharge of pumps utilizing a common exhaust pipe shall be fitted with a check valve, or a manual value
(locked open) or arranged to permit capping of the active pipe when removing or servicing the pump.
4. Install a drip leg at the base of each pump exhaust line riser.
5. Minimum exhaust pipe sizing required based on the medical vacuum system horsepower, configuration,
and the total pipe length (including elbows) in the medical vacuum exhaust line (See Figure 4).
a. The medical vacuum exhausts are joined together to one common exhaust.
b. Minimum pipe size must be maintained for the total length of exhaust pipe.
c. Use the next larger size pipe in the event the minimum size is not available.
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