Mold

What We Do

The Moment You Disturb Mold, the Air Becomes the Hazard

Mold colonies release spores passively, but the act of removing mold — cutting drywall, pulling insulation, scrubbing surfaces — dramatically amplifies spore release into surrounding air. Within seconds of starting work, spore concentrations in the room can reach levels that make the air itself a respiratory hazard for anyone present.

prePaer captures those spores at 0.12 microns, continuously, throughout the remediation process — reducing the airborne load that crews breathe, and preventing the cross-contamination that can spread a contained mold problem throughout an entire building.

The Scale of the Problem

Containment Plastic Redirects Air. It Does Not Filter It.

Negative pressure containment and plastic sheeting are standard practice on remediation jobs — but they address pressure differentials, not airborne particle concentrations. The air inside a containment zone can reach extremely high spore counts during active demolition. Crew members wearing respirators are protected when the seal is perfect, but ambient spore levels remain high. prePaer addresses the air volume itself, reducing spore concentration inside the work zone in real time throughout every phase of the job.

Consider This: What Happens in the Air During Active Remediation

What Your Crew — and the Building — Is Exposed to From the First Cut

Spore Release at Disturbance: Cutting through mold-affected drywall can release millions of spores per square foot into room air within seconds — far exceeding the capacity of dilution ventilation to remove them.
Spore Size vs. Filter Threshold: Most mold spores range from 2–100 microns in diameter — well above prePaer’s 0.12 micron capture threshold. However, hyphal fragments and mycotoxin-carrying particles can be much smaller, and prePaer captures those too.
Deep Lung Penetration: Particles below 5 microns bypass the upper respiratory tract entirely and reach the lower lung. Prolonged exposure at these levels is directly associated with respiratory disease and systemic illness in remediation workers.
Cross-Zone Migration: Spores travel on air currents, clothing, and foot traffic. Every time a worker exits the containment zone without adequate airlock protocol, spores migrate. Reducing the ambient concentration inside the zone reduces migration risk at every exit event.
Post-Remediation Air Quality Testing: Clearance testing measures residual airborne spore counts in treated areas. Continuous active filtration during the job contributes directly to lower post-remediation counts — improving the likelihood of passing on the first attempt.
Mycotoxin Exposure: Species like Stachybotrys (black mold) produce mycotoxins that travel attached to spore and hyphal fragments. Capturing the particles captures the toxin carriers — a direct occupational health benefit for the remediation crew.

Our Solution: The prePaer AER System

prePaer is portable, freestanding, and operational before the first cut is made. Run it inside the containment zone throughout demolition, material removal, and the drying phase. Its CADR 500+ capacity handles the high particle loads generated during active remediation without slowing down your crew’s workflow.

The prePaer AER System

Active Spore Filtration Throughout Every Phase of the Job

ULPA Capture at 0.12 Microns — Spores, Fragments, and Toxin Carriers:

prePaer’s proprietary ULPA filter captures 99.999% of particles at 0.12 microns and larger. This encompasses the full range of mold spores, hyphal fragments, and the fine particles that carry mycotoxins — removing them from the air volume continuously throughout the remediation process.

CADR 500+ — Built for High Particle Load Environments:

Active demolition generates particle loads far above what standard room air purifiers handle. prePaer’s high Clean Air Delivery Rate is specifically suited to environments where spore concentrations spike rapidly and require continuous high-volume filtration to keep pace.

Complement to Negative Air Machines — Not a Replacement:

NAMs create negative pressure to prevent contaminated air from escaping the work zone. prePaer filters the air within that zone. The two serve different but compatible functions — deploying both provides substantially stronger protection than either alone in high-severity remediation jobs.

Deployable at the Containment Boundary:

Position a second unit at the containment zone access point to filter air near the exit. This reduces spore migration each time workers pass in and out, protecting adjacent unaffected areas from cross-contamination throughout the duration of the project.

Plug-In, Job-Site Ready — No Installation Required:

prePaer requires no setup, no permits, and no infrastructure. Load it in the van, carry it to the job site, plug it in, and it is protecting the space before work begins. It moves from project to project as part of your standard remediation equipment.

Business Value

A Better Job Outcome Starts With Cleaner Air During the Job

Remediation businesses that deploy active air filtration during jobs are better positioned on every dimension that matters to clients and insurers: crew safety documentation, lower cross-contamination risk, cleaner post-remediation air tests, and a credible answer when property owners ask what protective measures are in place during the work.

prePaer is a piece of equipment that earns its place on every job — reducing liability exposure, supporting clearance test outcomes, and differentiating your company from competitors who rely on containment and PPE alone.

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Frequently Asked Questions

Can prePaer replace a negative air machine on a remediation job?

No — they serve different purposes. Negative air machines create pressure differentials to prevent contaminated air from escaping the containment zone. prePaer filters the air volume inside that zone. Used together, they provide substantially stronger protection: the NAM controls pressure, prePaer reduces spore concentration within the work area.

Does prePaer capture mycotoxins from black mold?

Mycotoxins produced by Stachybotrys and other species travel primarily attached to spore and hyphal fragments rather than as free-floating molecules. Because prePaer captures particles at 0.12 microns, it removes the particle carriers of mycotoxins from the air. Additionally, prePaer’s carbon filtration layer helps with odors and volatile compounds associated with mold. It is most effective as part of a comprehensive remediation strategy that also addresses the mold source itself.

How often does the filter need to be replaced during heavy mold remediation?

In situations involving extensive water intrusion where large amounts of mold spores are present, Claerosol recommends replacing the filter every two to three days until the mold sources have been fully remediated — then weekly replacement for a month following remediation. Under normal ongoing use after clearance, every two weeks is standard. Filter replacement frequency ultimately depends on the severity of the mold condition, the size of the affected area, and the duration of active remediation work.

Can prePaer be used in high-moisture environments during remediation?

Yes. prePaer can be used in environments with high moisture, such as rooms affected by water damage or active mold remediation, without losing efficiency. It should not be operated in standing water or where visible water spray could contact the filter or electrical cord.

Is prePaer safe for occupants who return to the space after remediation?

Yes. prePaer produces no ozone, no UV radiation, and no chemical byproducts. It is safe for occupants of all ages and health conditions, including children and immunocompromised individuals. Running it through the post-remediation period provides ongoing filtration as residual particles settle and the treated area stabilizes.

Protecting the Building, the Crew, and the People Who Return

Mold remediation is a high-stakes service. Property owners trust you to remove a health hazard without creating a secondary one. Active air filtration throughout the job is the operational practice that closes that gap — demonstrating to clients, insurers, and inspectors that contamination was managed at every phase, not just at the containment boundary.

prePaer fits naturally into IICRC-aligned remediation protocols as the air management layer within the work zone — a straightforward addition that strengthens your documentation, supports your crew’s health, and contributes to outcomes you can stand behind.

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AER For Patients