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Copyright 2009 - FAST SpA
Air Handling units
For hospital environment
FM-H
Copyright 2009 - FAST SpA
- Health directives
- Technical directives/norms
- AHUs FM-H: technical details
Presentation index
Copyright 2009 - FAST SpA
The term legionellosis(legionnaires disease) identifies forms of pulmonary
infection caused by different
species of aerobic bacteria of
the type Legionella (Legionella pneumophila is
the species most dangerous)
Problem of Legionella
Copyright 2009 - FAST SpA
Legionella infections are difficult
to distinguish from other types of
pneumonia
The Legionella (especially in the variant
"legionnaire's disease") is a serious disease, with high
lethality
Problem of Legionella
Copyright 2009 - FAST SpA
Problem of Legionella
Reference 15/12/2011: http://www.eurosurveillance.org/ViewArticle.aspx?Articleid=753
Copyright 2009 - FAST SpA
Problem of Legionella
Copyright 2009 - FAST SpA
Responsibilites
Due to recent incidents that occurred in hospitals with
episodes of deaths, dedicated institute opened a criminalinvestigation against the directors of the hospitals on chargeof negligent injury, wrongful death and violation of the law
626/94 on the protection of workers. It 'clear, however, that
can potentially be called into question all those involved in the
process of design, implementation, testing, maintenance, use
of the system: designers, general contractors, equipment
manufacturers, installers, test technician, maintainer, owner,
manager .
Extract from UNI communication
Problem of Legionella
Copyright 2009 - FAST SpA
All plants that pose a
moderate heating of water
and its spray (hospitals,
nursing homes, rest, hotels,
schools, spas, swimming
pools, ...) are potentially
under the risk
Especially, HOSPITALS
Dangerous environments
Problem of Legionella
Copyright 2009 - FAST SpA
Conditions for the development of Legionella
1 Optimal temperature for growth range from 25 to 42 C (best 37 C)
2 Aerobic (ambient with oxygen) and humid environment
3 Presence of nutrients: biofilms, slag, limestone and iron ions, other
microorganisms
4 Spraying water droplets forming with diameters ranging from 1 to 5
microns
Problem of Legionella
Copyright 2009 - FAST SpA
Mode of transmission
Spread by breathing contaminated water aerosols (main cause of transmission)
Alcohol, Smoking
Sex (men, mainly)
Advanced age
chronic lung disease
Problem of Legionella
Copyright 2009 - FAST SpA
Guidelines for the protection and promotion of health in confined spaces
Scope of the document
Structure of the document
To provide technical guidelines, to promote the
development of initiatives ... on pollution of indoor
environments (IAQ)"
Part 1: introduction
Part 2: prevention for indoor environments
Part 3: strategic lines for actuation of prevention for indoor
environments
Copyright 2009 - FAST SpA
Strategic lines of the risks dell'IAQ (summary)
Carry out a survey on the health of existing buildings
Prepare guidelines for designers and constructors of buildings
Prepare protocols relating to the maintenance
Prepare a reference standard for the protection of health
Verify the effectiveness of taken actions
Guidelines for the protection and promotion of health in confined spaces
Copyright 2009 - FAST SpA
General guidelines
in paragraph 5.2.6 of the guidelines refer directly to the
Guidelines for the prevention and control of legionellosis
to ensure compliance with the hygienic requisites of indoor air,
should refer to the provisions of ENV 12097 ("network of pipelines.
Requirements for components to facilitate maintenance of
networks of pipelines" - January 1997 ")
test procedures for limits in the pipelines should follow the
methodology described in the documentation prepared by NADCA
- National Air Duct Cleaners Association
The maintenance should be logged
Guidelines for the protection and promotion of health in confined spaces
Copyright 2009 - FAST SpA
Guidelines for the prevention and control of legionellosis
Prevention strategies in plant systems (summary)
prevent standing water;
limit the possibility of biological niches by making periodic
cleaning of equipment;
maintain efficient drift eliminators and filters;
avoid the critical temperature of water (25-55 C);
eliminate with proper treatment the biofilm (nourishment for
Legionella)
provide for water treatment;
Copyright 2009 - FAST SpA
Prevention strategies in plant systems (summary)
To program inspections on the installation of air conditioning to
check the status of humidifiers, evaporative cooling towers, the
location of the external sockets and the state of drainage
systems;
To check maintenance schedule and log
To design the air flow system to ensure accessibility for
maintenance operations;
Guidelines for the prevention and control of legionellosis
Copyright 2009 - FAST SpA
Specifications for components (summary)
Guidelines for the prevention and control of legionellosis
Copyright 2009 - FAST SpA
Silencers
- Must have surface finishes such as to limit the nesting of dirt, and to
ensure the ease of cleaning;
- Must be placed at an appropriate distance from humidifiers;
Inlet for Fresh air
- must be sized for speed
Copyright 2009 - FAST SpA
Filters:
- class F7 upstream of UTA;
- class F8 / F9 downstream of the UTA and any silencers;
- class F7 on the fresh air intake;
- must be serviced (cleaning and replacement)
Guidelines for the prevention and control of legionellosis
Specifications for components (summary)
Copyright 2009 - FAST SpA
Heat exchangers:
- cleaning often the heat exchanger;
- Sloping the drain pans
- make the pans with dedicated materials to prevent corrosion.
Adiabatic humidification
- Not suggested
- Checking the quality of water
- Cleaning often the system
Guidelines for the prevention and control of legionellosis
Specifications for components (summary)
Copyright 2009 - FAST SpA
Ducts:
- Compressed air system for cleaning is suggested
Logbook of maintenance
- ordinary and extraordinary maintenance on water systems and air
conditioning systems must be registered.
Guidelines for the prevention and control of legionellosis
Specifications for components (summary)
Copyright 2009 - FAST SpA
Norm UNI CTI 5/716
Abstract
air conditioning systems must be provided of accesses for
technical and hygiene inspections by qualified personnel. Each
control must be registered.
Inspection of tech and hygiene must involve ducts, local and
technical components of the air handling unit
Copyright 2009 - FAST SpA
Allowable limits for the concentration of particulate matter and
bacteria in the canals, for the test methods and limits for
bacterial contamination of components in CTA refers to the
technical documentation NADCA
Checkings, cleaning, disinfection must be carried out according to
a checklist proposed in a table
training of personnel hygiene facilities must be provided:
Category A: hygiene managers
Category B: for simple personal
Norm UNI CTI 5/716
Copyright 2009 - FAST SpA
Guidelines ASHRAE 12-2000
Scope of document
Giving directions to minimize the risk of Legionellosis
associated with water systems, swimming pools, air
conditioning systems, etc..
Abstract
The guideline addresses the problem with a comprehensive
approach is to identify areas characterized by higher critical
plant, consider the application situations (hospitals, hotels,
etc..) And propose intervention methods emphasizing the
aspect of prevention to stop the rise to the chain of
transmission of legionellosis.
Copyright 2009 - FAST SpA
Technical solutions inside FM-H
Problemi diigiene - salute pubblica
Strumenti giuridici enormativi
Progetto FM-H : soluzionetecnica
Attivit di ricerca e sviluppo
FAST
Copyright 2009 - FAST SpA
Range
0 5.000 10.000 15.000 20.000 25.000 30.000 35.000
Portata aria [m3/h]
FM-H 20
FM-H 28
FM-H 35
FM-H 42
FM-H 50
FM-H 57
FM-H 69
FM-H 82
FM-H 105
FM-H 119
FM-H 154
FM-H 194
FM-H 237
FM-H 286
FM-H 342
Mo
dell
o
Velocit frontale sul pacco di
scambio termico [m/s]
2,52
Technical solutions inside FM-H
Technical
solutions
inside FM-H
construction (easy to clean, inspected, materia
