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When construction takes place in an occupied hospital, infection control is a life-safety workstream, not a housekeeping task. Complete an infection-control risk assessment (ICRA) before mobilization, then use sealed barriers, controlled negative pressure, appropriate HEPA filtration or outdoor exhaust, segregated traffic and debris routes, worker changing facilities, and documented daily cleaning. Protect or relocate vulnerable patients according to the project risk, and maintain surveillance for airborne fungal disease when immunocompromised patients could be exposed.
Start with an ICRA before anyone mobilizes
The ICRA defines how the project can proceed without allowing construction dust, fungal spores, moisture or contaminated debris to reach care areas. It should be completed before demolition, ceiling access, shutdowns or material delivery, and it should remain a live document as the scope changes.
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What the assessment must consider
- Work scope and duration: distinguish a short, low-dust repair from demolition, ceiling-tile removal, drilling, grinding or work above a false ceiling.
- Dust and moisture hazards: identify activities that release respirable particles, disturb hidden mold or create water aerosols.
- Patient susceptibility: map intensive-care, transplant, oncology, neonatal, burn and other areas where patients may be especially vulnerable to airborne infection.
- Building systems: review air-handling zones, return-air paths, pressure relationships, fire alarms, sprinklers, water systems, elevators and emergency egress.
- Containment and contingencies: specify barrier construction, pressure control, filtration or exhaust, monitoring, cleaning, patient moves and what happens if a barrier fails or a pressure alarm is triggered.
Build one accountable team
Infection prevention, hospital engineering, facilities, clinical operations and the contractor should approve the ICRA together. Educate construction workers and healthcare staff in immunocompromised-care areas about airborne infection hazards, permitted routes, protective clothing, reporting requirements and the actions to take when dust escapes. The person authorized to stop work must be named in the project plan; otherwise a pressure alarm or visible breach can be ignored while responsibilities are debated.
Make the work zone a sealed, controllable compartment
Barriers are the primary protection
Construct barriers that are impermeable to fungal spores and comply with local fire codes. Rigid panels, prefabricated systems or heavy-duty plastic enclosures may be appropriate, but the choice depends on the dust level, duration, traffic, fire rating and ability to inspect the perimeter. Seal joints, tops, bottoms, windows and temporary doors. When rigid barriers are used, block and seal return-air vents so contaminated air cannot be drawn into the hospital system.
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Do not treat a barrier as complete when the visible panels are installed. Inspect the ceiling line, floor junction, penetrations, corners and utility openings. Temporary doors should close fully and remain latched except during controlled passage. Any opening for a cable, pipe, waste container or material delivery needs a sealed detail that can be checked after each use.
Establish negative pressure next to care areas
Work zones adjacent to patient-care areas are generally maintained at negative pressure so air flows from the clean hospital side into the construction zone, rather than carrying dust outward. Verify that the affected air-handling system is operating correctly before placing the enclosure under negative pressure. Use a pressure monitor or equivalent airflow indicator at the boundary, document readings at the interval set by the ICRA, and check airflow direction whenever doors, exhaust equipment or the building ventilation configuration changes.
Pressure control is not a substitute for a sealed barrier. If the monitor shows loss of negative pressure, or a tissue test indicates airflow toward a care area, stop dust-generating work, secure the enclosure, inspect for gaps, confirm exhaust operation and repair the breach before restarting. Record the event and corrective action.
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Use HEPA filtration or direct outdoor exhaust for major repairs
For major dust-generating work, including ceiling-tile removal or disruption above a false ceiling, CDC guidance describes a plastic or prefabricated enclosure kept under negative pressure with either a portable industrial HEPA filter or exhaust discharged outdoors. A portable industrial HEPA unit should be selected for the enclosure volume and the required air changes, not simply for its nameplate fan size.
| Engineering figure | What it describes | How to apply it |
|---|---|---|
| 300–800 ft³/min | Portable industrial HEPA filtration capacity cited by CDC/HICPAC in the 2003 guideline and on the current CDC recommendation page | Use as a selection range for augmenting removal of respirable particles; confirm the actual unit performance, duct losses and enclosure volume with facility engineering |
| At least 12 ACH equivalent | Air-change performance CDC describes for selected portable HEPA units where applicable | Calculate from the enclosed volume and delivered airflow; do not assume a fan’s rated flow equals delivered flow after filters and ducting |
| 2.5 Pa (0.01-inch water gauge) | Negative pressure value in CDC/HICPAC guidance for airborne-infection isolation rooms (AIIRs) | Use for AIIR design and verification where applicable, not as an automatic construction-enclosure target unless the ICRA and engineers specify it |
| 6 ACH existing / 12 ACH new or renovated | CDC glossary figures for AIIR ventilation | Apply to AIIR structures under the applicable design standard; construction enclosures require project-specific calculations |
These figures are engineering guidance, not a universal substitute for the facility’s ICRA, calculations, applicable AIA/FGI edition, fire code and jurisdictional requirements. Confirm the pressure setpoint, airflow, exhaust termination and alarm response with the hospital’s responsible engineer.
Match containment to the work and the patients nearby
There is no safe “one-size-fits-all” enclosure. The ICRA should select controls by combining dust generation, duration, proximity to occupied rooms, patient susceptibility and the ability to inspect and clean the system.
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| Project condition | Typical containment approach | Controls that must be resolved before work |
|---|---|---|
| Short, low-dust task outside a care room | Localized sealed partition or enclosure with protected surfaces and controlled access | Dust suppression, route separation, surface protection, cleaning frequency and whether nearby supply or return grilles need isolation |
| Moderate dust from drilling, wall opening or service replacement | Full-height sealed barrier, negative pressure and portable HEPA filtration | Pressure monitoring, filter placement, door management, worker entry procedure and waste-cart route |
| High-dust demolition, ceiling work or prolonged renovation beside occupied care | Rigid or prefabricated enclosure, negative pressure, portable industrial HEPA filtration or outdoor exhaust, and enhanced inspection | Air-handling isolation, fire-code review, emergency egress, patient relocation, continuous or frequent monitoring and a documented contingency plan |
The table is a planning framework, not a permit. The final class of precautions belongs in the project ICRA and must reflect local code and the facility’s adopted design standard.
Control people, tools and debris at the boundary
Separate construction traffic from patient traffic
Direct pedestrian traffic away from construction zones and patient-care areas. Give the crew designated entrances, corridors, elevators, toilets, changing and storage space, and routes for bringing in materials and taking out waste. A route that passes through a nursing unit, waiting room or clean supply area defeats an otherwise effective enclosure.
Keep windows closed or sealed where practical. Maintain the pressure differential during deliveries and debris removal; a wide-open temporary door can reverse airflow even when the exhaust fan is running. Schedule large moves during lower-traffic periods when clinical operations approve them, but do not rely on scheduling as the primary containment measure.
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Provide a clean-to-dirty worker transition
Workers should enter and leave through the designated construction access point. Provide changing or storage space so dusty clothing and personal items do not travel into clinical areas. The ICRA should specify protective clothing, footwear controls and when respiratory protection or other personal protective equipment is required by the hazard assessment. Remove disposable coverings and place reusable protective clothing in the defined dirty-side process; do not shake dust from garments in a corridor.
Clean carts, tools and entrances
- Wet-wipe tools and carts before they leave the work zone.
- Place tacky mats inside entrances and replace them when they no longer capture debris.
- Keep the enclosure, access point and adjacent hospital side visibly clean every day, or more often when the work creates dust.
- Cover and secure debris before transport. Use sealed containers or covered carts that can be cleaned and do not leak.
- Never stage waste, gypsum, insulation or packaging in a patient-care corridor while waiting for an elevator.
Cleaning should be assigned to named personnel with a checklist and time recorded. If a vacuum is used, it should be suitable for the dust and equipped with the filtration specified by the safety and infection-control plan; ordinary housekeeping equipment can redistribute fine particles.
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Keep patients out of rooms during dust-generating activities
Do not leave patients in rooms during dust-generating activities. Coordinate the work window with the clinical team, confirm the room is empty before opening a ceiling or wall, and prevent unscheduled re-entry until cleanup and inspection are complete.
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Decide when relocation is necessary
Relocate patients adjacent to the work when their immune status, the project scope, dust or water-aerosol potential, or the demonstrated effectiveness of controls makes continued occupancy unsafe. The decision should be made by clinical leadership and infection prevention with engineering input, not by the contractor alone. Consider temporary moves for patients receiving intensive immunosuppression, those in protective environments, and anyone whose treatment or condition makes an airborne exposure especially consequential.
If relocation is not possible, strengthen the controls in the ICRA: increase inspection and pressure monitoring, schedule the highest-dust steps when the room is unoccupied, verify that supply and return paths are protected, and define a stop-work trigger for any visible dust or pressure failure.
Maintain fungal-disease surveillance
Determine whether immunocompromised patients may be exposed to fungal spores. During and after high-risk work, maintain active surveillance for airborne fungal infections and review microbiologic, histopathologic and postmortem data for additional cases. A cluster of unexplained respiratory illness, a new environmental mold finding or repeated barrier failures should trigger an immediate review of exposure pathways and the contingency plan.
Operate the controls every day, not just at handover
Use a start-of-shift inspection
- Confirm the barrier is intact from floor to deck, including penetrations, doors and sealed grilles.
- Verify the air-handling configuration, exhaust discharge and negative-pressure indicator.
- Check HEPA units, prefilters, alarms, power, duct connections and filter loading.
- Inspect tacky mats, protective clothing supplies, waste containers and route signage.
- Confirm the day’s work will not place a patient in an affected room and that clinical contacts know the schedule.
Document during the shift
Record pressure or airflow checks, filter or exhaust status, cleaning times, debris removals, deliveries, barrier repairs and any complaints of odor, dust or noise that could indicate a control failure. Keep records available to infection prevention, engineering and the project supervisor. A monitor that is installed but never reviewed provides no protection.
Close out safely
Before removing barriers, complete final cleaning, remove debris through the controlled route, inspect adjacent rooms and verify that normal ventilation has been restored. Infection prevention and facilities should accept the area for clinical use. Remove temporary seals from air systems only after the enclosure is clean and the project team confirms that doing so will not redistribute dust.
Failure modes and immediate corrections
| Observed problem | Likely consequence | Immediate response |
|---|---|---|
| Negative pressure is lost | Dust can move toward occupied care areas | Stop dusty work, close the access door, check power and exhaust, find barrier gaps, restore airflow and document the event |
| Dust is visible outside the enclosure | Contamination of corridors, rooms or equipment | Isolate the route, notify infection prevention, wet-clean affected surfaces, inspect the barrier and determine whether exposed patients require assessment |
| Debris cart is uncovered or leaking | Particles spread during transport | Return it to the work zone, secure the load, clean the route and use the approved covered container |
| Patient remains in a room during ceiling or wall disturbance | Direct exposure to construction dust | Stop work, move the patient with clinical approval, clean and assess the room, and review why the pre-work check failed |
| Water intrusion or wet materials appear | Amplified mold and bacterial growth risk | Stop the source, protect patients and supplies, dry the area promptly, and reassess the ICRA before continuing |
Use the ICRA as the project decision record
A defensible plan states the dust category, barrier design, pressure method, monitoring interval, HEPA or exhaust specification, traffic routes, cleaning assignments, patient-protection decision, surveillance plan and stop-work triggers. It also identifies the applicable fire, building, occupational-safety and healthcare-design requirements. CDC infection-control principles are authoritative for the measures described here, but exact barrier classes, pressure-monitoring intervals, fire-code details and patient-relocation thresholds vary by facility, jurisdiction and the AIA/FGI edition adopted for the project. The hospital’s infection-prevention and engineering authorities must verify those local requirements before construction begins.
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