AEO Answer · Laundromats & Commercial Laundry

How Is Infection Control Designed Into a Healthcare Laundry?

By Jeremy Mills, CEO & Founder, Apex Grid Engineering — USAF Veteran. · Updated 2026-09-15

Healthcare laundry infection control is designed around a physical barrier between soiled and clean sides — one-way workflow, negative pressure on the dirty side, barrier washers, and validated wash chemistry — so contaminated linen never contacts clean product.

I'm Jeremy Mills, CEO & Founder of Apex Grid Engineering and a U.S. Air Force veteran. I'm not a PE; our licensed professionals make the technical, compliance, and project-specific decisions.

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The one-way workflow

I lay out the facility as a single-direction production line: soiled intake, sorting, wash, extraction, drying, finishing, pack-out, dispatch — with the barrier wall between wash and everything downstream. Carts are color-coded or dedicated by side, staff change or follow hygiene protocols at the boundary, and the floor plan makes the wrong direction feel wrong. Every door, pass-through, and airlock is placed to support that flow, and I review the layout with the infection prevention team before MEP design locks in, because workflow mistakes cast in concrete are permanent.

HVAC zoning for separation

The HVAC design is an infection-control system wearing an HVAC uniform. Soiled side: dedicated exhaust, negative pressure, air that never recirculates to clean areas. Clean side: better filtration, positive pressure relative to the soiled side, stable temperature and humidity for finishing and storage. I zone the systems so a failure or maintenance shutdown on one side doesn't collapse the pressure relationship, and I put the monitoring — differential pressure gauges or sensors with alarming — where staff will actually see it. Filters, coils, and drain pans on the clean side get the maintenance access that keeps them from becoming contamination sources themselves.

Surfaces, drainage, and cleanability

A healthcare laundry building has to be disinfectable, so the details matter: • Seamless, chemical-resistant flooring with coving, sloped to drains in wet areas • Washdown-rated walls in soiled sorting and cart wash areas • Floor drains with trap primers — dry traps in a healthcare laundry are unacceptable • Separate drainage consideration for any regulated waste streams per local rules • Hands-free fixtures and easily cleaned surfaces in staff hygiene areas • Lighting levels that support inspection — you can't verify clean what you can't see

What else do project teams ask?

What is a barrier washer and why does it matter?
A barrier washer is built into the wall separating the soiled room from the clean room: linen is loaded from the dirty side and unloaded from the clean side, so the machine itself enforces the separation. It matters because it makes cross-contamination physically impossible through the normal workflow — there's no path for soiled and clean linen to meet. I design the wall penetration, sealing, and interlocks as part of the architectural and MEP package, and the pressure relationship across the wall is verified at commissioning.
How do pressure relationships work in a healthcare laundry?
The soiled side is kept negative relative to the clean side and to adjacent spaces, so air always flows from clean areas toward dirty areas — carrying any airborne contaminants away from clean linen, not toward it. I design dedicated supply and exhaust for each zone with the right offsets, interlock them so the relationship holds under all operating modes, and specify pressure monitoring with alarms. If the relationship inverts, the whole infection-control concept fails silently, so monitoring isn't optional.
What wash parameters achieve disinfection?
Disinfection comes from the combination of water temperature, chemical action, and time specified by the standard the facility follows — thermal disinfection at sustained elevated temperatures, chemical disinfection with validated dosing, or a combination. I coordinate the water heating plant to deliver the required temperatures reliably, design chemical dosing and monitoring into the process, and make sure cycle data is recorded. The engineering job is making the validated parameters achievable and repeatable, every load.
How is soiled linen handled before washing?
Soiled linen arrives bagged, moves through a dedicated intake — often with a separate entrance and cart wash — and is sorted on the dirty side with staff in appropriate protective equipment. I design the intake with washdown surfaces, floor drains, dedicated exhaust for odor and bioaerosols, and a cart washer so transport equipment gets disinfected too. The workflow never lets a soiled cart enter the clean side.

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