Filtration Requirements
In healthcare settings, maintaining optimal indoor air quality (IAQ) is paramount for patient safety and infection control. Hospital facilities employ elevated MERV (Minimum Efficiency Reporting Value) rated filtration systems compared to residential HVAC equipment. These higher-rated filters capture a broader range of airborne particles, including mould spores, bacteria, and viruses, contributing to improved IAQ and reduced infection risks.
Elevated MERV Ratings
MERV ratings range from 1 to 16, with higher ratings indicating increased particle capture efficiency. Residential HVAC systems typically utilise MERV 6 to 8 filters, while hospital facilities commonly employ MERV 13 or higher filters. These elevated MERV ratings significantly enhance the ability to remove airborne contaminants, reducing the risk of airborne transmission of pathogens.
Supplemental HEPA Negative Air Machines
During renovation or construction activities that involve opening walls or ceilings, additional measures are necessary to control airborne contaminants. Supplemental HEPA (High-Efficiency Particulate Air) negative air machines are often employed to create negative pressure within designated areas, preventing airborne particles from escaping into occupied spaces.
Restricted Airborne Bacteria Pathways
Opened walls and ceilings can provide pathways for airborne bacteria to spread, increasing the risk of infection. By employing HEPA negative air machines, healthcare facilities effectively restrict these pathways, minimising the risk of airborne transmission.
Balancing Filtration and Energy Efficiency
While elevated MERV ratings enhance filtration efficiency, they can also increase air resistance, potentially impacting energy consumption. Healthcare facilities should strike a balance between filtration performance and energy efficiency, selecting the most appropriate MERV rating for their specific needs and considering energy-efficient filter designs.
Regular Filter Maintenance
Regular filter maintenance is crucial to maintain optimal filtration performance and IAQ. This includes timely replacement of filters according to manufacturer recommendations and thorough cleaning of HVAC systems to remove accumulated debris.
Barrier Controls
Healthcare facilities must establish clearly demarcated barriers to segregate drying containment zones from active patient wings. These barriers should include locked anterooms that can only be accessed by authorised personnel wearing proper protective gear. This controlled access helps to prevent the spread of airborne contaminants, such as construction dust and mould spores, which can pose significant health risks to vulnerable patient populations, including those with compromised immune systems.
Demarcated Containment Zones
Clearly define and demarcate drying containment zones to restrict access to areas where construction or renovation activities are ongoing. These zones should be separated from active patient wings by physical barriers, such as walls, doors, and plastic sheeting.
Locked Anterooms
Establish locked anterooms at all entry and exit points between drying containment zones and active patient wings. These anterooms should serve as a transition area where personnel can don and doff proper protective gear, including gloves, masks, and gowns, before entering or exiting the containment zone.
Controlled Access
Restrict access to drying containment zones to authorised personnel only. This includes construction workers, contractors, and any other individuals who need to enter the area for work purposes. All personnel must always wear proper protective gear while in the containment zone.
Thresholds and Limiting Exposures
Equip entry and exit points with designated thresholds to minimise the transfer of airborne contaminants between the containment zone and active patient wings. These thresholds may involve airlock systems, double doors, or other measures that create a buffer zone.
Protecting Vulnerable Populations
Stringent barrier controls are particularly crucial for protecting vulnerable patient populations, such as immunocompromised individuals and those with respiratory conditions. These individuals are at increased risk of adverse health effects from exposure to construction dust and mould spores.
Continuous Monitoring and Enforcement
Healthcare facilities must continuously monitor and enforce barrier control protocols to ensure their effectiveness in preventing the spread of airborne contaminants. This may involve regular inspections, staff training, and prompt corrective actions when necessary.
By establishing clearly demarcated barriers, enforcing controlled access, and prioritising the protection of vulnerable populations, healthcare facilities can create a safer and healthier environment for patients and staff during construction or renovation activities.
Protected Environments
In healthcare settings, immunocompromised patients, individuals with weakened immune systems, face heightened vulnerability to infections. To safeguard these individuals during construction or renovation activities, healthcare facilities must establish secondary enclosures around immunosuppressed patient wings. These enclosures should incorporate additional airlocks, staged pressure differentials, and UV scrubbers to maintain ultra-pure air conditions and protect those with minimal viral tolerance.
Secondary Enclosures
Secondary enclosures provide an extra layer of protection for immunocompromised patients by creating a physical barrier between the construction zone and the patient wing. These enclosures may consist of walls, doors, and plastic sheeting, effectively isolating the patient area from airborne contaminants.
Additional Airlocks
Airlocks serve as controlled passageways between areas with different pressure levels, preventing the uncontrolled transfer of airborne contaminants. Implementing additional airlocks within the secondary enclosures further enhances the protection of immunocompromised patients by minimising the risk of cross-contamination.
Staged Pressure Differentials
Maintaining staged pressure differentials between the construction zone, secondary enclosures, and the patient wing is crucial for preventing the spread of airborne contaminants. This pressure gradient ensures that air flows from the patient wing towards the construction zone, preventing contaminated air from entering the patient area.
Ultra-Pure Air Conditions
Ultra-pure air conditions are essential for safeguarding immunocompromised patients from airborne pathogens. Implementing UV scrubbers, which utilise ultraviolet light to inactivate microorganisms, helps to eliminate viruses, bacteria, and mould spores from the air.
Eventual Discharge Filtration
Before releasing air from the secondary enclosures back into the general environment, it is critical to pass it through high-efficiency particulate air (HEPA) filtration systems. HEPA filters effectively capture even the smallest airborne particles, ensuring that the discharged air is free of contaminants.
Protecting Those with Minimal Viral Tolerance
Immunocompromised patients, particularly those with minimal viral tolerance, are highly susceptible to infections. By establishing protected environments, healthcare facilities can create a haven for these vulnerable individuals, minimising their exposure to airborne contaminants and protecting their well-being.
Continuous Monitoring and Maintenance
Continuous monitoring and maintenance of the protected environment infrastructure are essential for ensuring its effectiveness. This includes regular inspections of airlocks, pressure differentials, and filtration systems to identify and address any potential issues promptly.
Through the implementation of secondary enclosures, additional airlocks, staged pressure differentials, UV scrubbers, and eventual discharge filtration, healthcare facilities can create a protective sanctuary for immunocompromised patients, safeguarding them from the risks associated with construction or renovation activities.
Scrubbable Surfaces
In contrast to porous construction materials commonly used in residential settings, hospital wall assemblies incorporate non-porous monolithic sheathing. This non-porous design prevents the absorption of biological materials, enabling thorough and repeated antimicrobial disinfection stages between replacement steps during sequenced repairs. This approach allows hospital operations to continue nearby through interim measures, minimising disruptions to patient care.
Impeding Microbial Growth
Non-porous monolithic sheathing provides a smooth, impervious surface that inhibits the adhesion and growth of microorganisms. This characteristic facilitates effective disinfection, preventing the establishment of biofilms that can harbour and spread pathogens.
Repeated Disinfection Stages
The non-porous nature of hospital wall assemblies enables repeated antimicrobial disinfection stages throughout the construction process. This ongoing disinfection helps to eliminate potential contaminants and maintain a clean and hygienic environment.
Sequencing Repairs
By sequencing repairs, healthcare facilities can minimise disruptions to patient care. This involves scheduling repairs in phases, allowing one area to be under construction while other areas remain operational.
Interim Measures
During construction phases, interim measures can be implemented to protect patients and staff from airborne contaminants. These measures may include establishing temporary barriers, utilising HEPA filtration systems, and enhancing air handling protocols.
Maintaining Hospital Operations
By adopting non-porous monolithic sheathing, sequencing repairs, and implementing interim measures, healthcare facilities can maintain hospital operations throughout construction or renovation activities, ensuring the continued delivery of care while prioritising patient safety.
Continuous Monitoring
Regular monitoring of the construction site and surrounding areas is essential to identify and address any potential risks to patient safety. This monitoring may include air quality testing, surface swabbing, and visual inspections.
Through the utilisation of non-porous monolithic sheathing, sequenced repairs, and interim measures, healthcare facilities can effectively manage construction activities while maintaining a safe and operational environment for patient care.
