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HEPA Negative Air Machines

Negative air machines with true HEPA final filtration for hazardous material abatement and remediation. Four-stage systems capture asbestos fibers, mold spores, and lead dust. Used by licensed abatement contractors during asbestos, lead paint, and mold remediation projects.

Original price $1,133.50 - Original price $1,133.50
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Abatement Technologies H2KM Negative Air Machine – 2000 CFM, 3-Stage HEPA

Abatement Technologies
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Abatement Technologies HEPA-AIRE H2KM — 2,000 CFM Negative Air Machine and Air Scrubber The Abatement Technologies HEPA-AIRE H2KM is an industrial-...

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Original price $1,133.50 - Original price $1,133.50
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Original price $1,247.50 - Original price $1,247.50
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Abatement Technologies BD2KM Negative Air Machine – 2000 CFM, 2-Speed, HEPA

Abatement Technologies
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BD2KM Negative Air Machine — Roto-Molded 2,000 CFM HEPA, 2-Speed Motor The Abatement BULLDOG BD2KM is the two-speed version of the BULLDOG series ...

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Abatement Technologies H2KMA Deluxe Negative Air Machine – 2000 CFM, 1 HP HEPA

Abatement Technologies
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H2KMA Deluxe Negative Air Machine — 2,000 CFM HEPA for Large Containment Zones The Abatement Technologies HEPA-AIRE H2KMA Deluxe is the high-capac...

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Aerospace America 9100 Turbo Negative Air Machine – 2500 CFM, 1.75 HP, 116 lbs, SKU 9100

Aerospace America
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Aerospace America 9100 Turbo Negative Air Machine — 2500 CFM, 1.75 HP The Aerospace America 9100 Turbo is the highest-output unit in the Aeroclean ...

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Novatek Novair 1000 Standard Filter Negative Air Machine – F1205, 220V CE

Novatek
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CE-Certified 220V General-Purpose Negative Air MachineThe Novatek Novair 1000 (F1205) is the CE-certified 220V variant of the F1005, providing 1000...

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Novatek Novair 1000 Negative Air Machine – F1005, 1000 CFM, Standard Filter

Novatek
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General-Purpose 1000 CFM Negative Air Machine for Construction and RenovationThe Novatek Novair 1000 (F1005) delivers the same 1 HP, 1000/500 CFM t...

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Novatek Novair 1000 Negative Air Machine – F1000, 1000 CFM, 1 HP, HEPA

Novatek
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1000 CFM Negative Air Machine for Abatement and Hazmat ContainmentThe Novatek Novair 1000 (F1000) delivers true 1000 CFM airflow with all filters i...

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Abatement Technologies BD2KMA Deluxe Negative Air Machine – 2000 CFM, HEPA

Abatement Technologies
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BD2KMA Deluxe Negative Air Machine — Roto-Molded 2,000 CFM HEPA for Harsh Job Sites The Abatement BULLDOG BD2KMA Deluxe is the variable-speed vers...

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Original price $1,293.50 - Original price $1,293.50
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Abatement Technologies H1990M Negative Air Machine – 1600 CFM, 1 HP, HEPA

Abatement Technologies
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H1990M Negative Air Machine — 1,600 CFM HEPA Containment in a 125-Pound Portable Unit The Abatement Technologies HEPA-AIRE H1990M is a dual-speed ...

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HEPA Negative Air Machines for Hazardous Material Abatement

What Makes a Negative Air Machine "HEPA"

HEPA stands for High Efficiency Particulate Air — a filtration standard requiring 99.97% capture efficiency for particles 0.3 microns in diameter, the most penetrating particle size for fibrous filters. Asbestos fibers, the primary hazard in abatement work, range from 0.1 to 10+ microns; the thin, respirable fibers under 3 microns that cause mesothelioma and asbestosis are well within the HEPA capture range. A HEPA-certified negative air machine exhausts air that has passed through a true HEPA final filter — meaning the air leaving the machine and entering the building exterior is effectively free of asbestos fibers, lead dust particles, and mold spores at concentrations that pose a health risk. Non-HEPA machines with standard filters allow these particles to pass through the exhaust.

HEPA Negative Air Machines vs. Standard Air Scrubbers

Negative air machines and air scrubbers both use HEPA filtration, but they perform different functions in an abatement project. Negative air machines exhaust filtered air to the outside of the containment, creating negative pressure — air flows in through gaps in the poly containment rather than out, preventing fiber migration to adjacent spaces. Air scrubbers recirculate room air through the filter without exhausting outside, reducing airborne particle concentrations but not creating negative pressure. For Class I asbestos work and most regulated abatement requiring negative pressure containment, HEPA negative air machines are the required equipment; air scrubbers are used in addition for general air quality control or in scenarios where negative pressure is not required by the abatement specification.

Related collections: negative air machines, air scrubbers, Abatement Technologies, asbestos removal equipment, flood and dust management

Sizing HEPA Negative Air Machines for Your Containment

EPA and OSHA guidelines for asbestos abatement require a minimum of four air changes per hour inside the containment, with some specifications requiring six or more for high-fiber-generation tasks. To calculate required CFM: multiply the containment volume in cubic feet by the required air changes per hour, then divide by 60 to get the required CFM. A 10,000 cubic foot containment at four air changes per hour requires 667 CFM minimum — achievable with a single 1,000 CFM machine with headroom for duct losses and filter loading. Use multiple machines for larger containments or when redundancy is required; a single machine failure must not shut down the abatement project entirely on occupied building jobs.

Frequently Asked Questions

What is a HEPA negative air machine?
A HEPA negative air machine draws air from a contained work area, filters it through a HEPA filter (capturing 99.97% of particles ≥0.3 microns), and exhausts the cleaned air outside the containment — creating negative pressure inside. This prevents airborne contaminants like mold spores, asbestos fibers, and lead dust from escaping into adjacent spaces during abatement or remediation work. They are required on mold and asbestos jobs under EPA and OSHA guidelines.
Is a negative air machine necessary for mold remediation?
For any mold remediation exceeding 10 sq ft, the EPA recommends containment with negative air pressure. Without negative pressure, opening walls or disturbing moldy material releases spores into the rest of the building — spreading contamination to areas that were previously clean. IICRC S520 standards require negative air during Category 3 and larger mold remediation projects. It is not optional on professional jobs.
Where should I vent a negative air machine?
Exhaust should be directed outside the building — through a window, door, or exterior vent — so that filtered air is expelled outdoors rather than recirculated into adjacent rooms. Use rigid or flexible ducting sized to the machine's exhaust port. When exhausting through a window, seal gaps around the duct with foam or plastic sheeting. Never exhaust into an attic, crawlspace, or HVAC return.
How many negative air machines do I need?
Calculate air changes per hour (ACH) required for your containment zone. Mold remediation typically requires 4–6 ACH; asbestos abatement may require 6–12 ACH per project specifications. Divide containment cubic footage by the machine's CFM rating × 60 to get ACH. For a 10×12×8 ft room (960 cu ft) needing 6 ACH, you need 96 CFM — one standard 500–1000 CFM unit provides significant headroom. Larger containment areas require multiple machines positioned for cross-draft airflow.
What are the negative side effects of HEPA air purifiers used during abatement?
When properly sized and operated, HEPA negative air machines have no significant negative effects — they are the safety control, not a hazard. Undersized units that cannot maintain negative pressure are the real risk: the containment loses effectiveness and contaminants migrate. Signs of inadequate negative pressure include doors pushing outward from the containment and smoke tests showing air moving out rather than in. Always verify pressure differential with a manometer on regulated jobs.

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