ALORAIR PureAiro HEPA Max 770 Air Scrubber 800 Sq. ft – Q&A

A contractor runs an air scrubber rated for 800 square feet in a 1,200-square-foot water damage job site and particulate levels stay elevated. The coverage number on the box means nothing without understanding the airflow and air changes behind it. The ALORAIR PureAiro HEPA Max 770 delivers genuine HEPA filtration for restoration and construction environments, but matching it to the actual cubic volume of your work area determines whether it cleans effectively or just moves dirty air around.

This Q&A guide covers every specification, use case, limitation, and comparison for the PureAiro HEPA Max 770. You will find exact CFM data, filter replacement costs at current pricing, noise levels at each speed setting, ducting configurations, and side-by-side comparisons against the most common alternatives in the restoration air scrubber category.

What Is the ALORAIR PureAiro HEPA Max 770 Air Scrubber and Who Is It For?

The ALORAIR PureAiro HEPA Max 770 is a portable commercial-grade air scrubber designed for restoration contractors, mold remediation professionals, and construction crews. It uses a three-stage filtration system that includes a washable pre-filter, an activated carbon filter, and a True HEPA filter to capture airborne particles down to 0.3 microns at 99.97% efficiency.

This unit is not a residential air purifier. It is built for job sites where dust loads are heavy and continuous: water damage restoration, fire damage cleanup, asbestos abatement containment areas, lead paint remediation, and construction dust control. The 770 CFM maximum airflow rating means it can cycle the air in 800 square feet of standard-height workspace multiple times per hour when configured correctly.

Restoration professionals choose air scrubbers over standard air purifiers because scrubbers handle higher particulate loads, accept ducting for negative air pressure setups, stack for increased capacity, and operate continuously for weeks at a time without motor failure. The PureAiro HEPA Max 770 competes directly with units like the Mounto 550 CFM air scrubber and the PuriSystems 900 CFM air scrubber in the contractor-grade segment.

What Are the Complete Technical Specifications of the PureAiro HEPA Max 770?

The PureAiro HEPA Max 770 operates on standard 115V/60Hz power drawing approximately 3.5 amps at maximum fan speed. The unit weighs 45 pounds and measures 20.5 inches wide by 20.5 inches deep by 23.5 inches tall with a molded plastic housing designed for stackability up to three units high.

Airflow ranges across three speed settings: low speed delivers approximately 350 CFM, medium speed pushes 550 CFM, and high speed reaches 770 CFM. These are free-flow ratings measured without filters installed. Actual working airflow with clean filters is typically 10 to 15 percent lower, and loaded filters reduce it further.

The filtration stack moves air through a coarse washable pre-filter that captures particles above 10 microns, then an activated carbon filter that adsorbs VOCs and odors, and finally a True HEPA filter rated at 99.97% efficiency at 0.3 microns. The HEPA filter is a 12-inch-deep pleated panel with approximately 40 square feet of media surface area. A genuine ALORAIR replacement HEPA filter costs between $120 and $160 depending on the supplier.

The unit includes an auxiliary outlet on the control panel rated at 15 amps for daisy-chaining additional equipment. Two 12-inch duct intakes and one 12-inch exhaust outlet allow flexible ducting configurations. A filter change indicator light on the control panel signals when the pressure differential across the HEPA filter exceeds the recommended threshold.

How Do You Calculate Actual Coverage for the PureAiro HEPA Max 770?

Coverage area claims on air scrubbers are misleading because manufacturers rarely state the air changes per hour assumption behind the number. The PureAiro HEPA Max 770 is rated for 800 square feet, but this only holds true at 8-foot ceiling height with a specific ACH target that ALORAIR does not explicitly publish. Here is the actual math.

Use the formula: ACH equals CFM times 60 divided by room cubic volume. At 770 CFM maximum airflow, a room measuring 800 square feet with 8-foot ceilings has 6,400 cubic feet. That produces 7.2 air changes per hour at full speed with clean filters. At medium speed of 550 CFM, the same room gets 5.2 ACH. At low speed of 350 CFM, it drops to 3.3 ACH.

For mold remediation work, the IICRC S520 standard recommends a minimum of 4 ACH in containment areas. The PureAiro 770 achieves this at medium speed in an 800-square-foot space and at high speed in spaces up to approximately 1,200 square feet with standard ceiling height. For lead paint abatement under EPA RRP requirements, the higher airflow at maximum speed provides an added safety margin in containment zones.

If your work area has 10-foot or 12-foot ceilings, recalculate the cubic volume. An 800-square-foot room with 12-foot ceilings contains 9,600 cubic feet. At 770 CFM, that delivers only 4.8 ACH. Increase your air scrubber count or select a higher-CFM unit like the 900 CFM air scrubber category for taller spaces.

What Are the Correct Ducting and Setup Configurations for the PureAiro 770?

The PureAiro HEPA Max 770 supports negative air pressure setups, positive pressure setups, and recirculating air scrubber configurations. The correct configuration depends entirely on the job type. Negative air pressure is required for mold remediation, asbestos abatement, and lead paint work to prevent contaminant spread to unaffected areas.

For negative air pressure setup, connect a 12-inch layflat duct to the exhaust outlet on the unit and run the duct to an exterior window or door opening. Seal the window opening around the duct with plastic sheeting and tape. The unit now pulls air from the containment area through the three-stage filter and exhausts HEPA-filtered air outside. This creates a pressure differential that prevents airborne contaminants from escaping the work zone through gaps, doorways, or wall penetrations.

Verify negative pressure by checking that plastic sheeting on doorways pulls inward toward the containment area. You need approximately 0.02 inches of water column negative pressure differential for effective containment, which the PureAiro 770 achieves in spaces up to 1,000 cubic feet when properly sealed.

For recirculating air scrubbing without negative pressure, remove the exhaust duct and let the unit discharge filtered air directly back into the room. This configuration works for general dust control during construction, post-work cleanup, and air quality improvement in occupied spaces. Position the unit centrally and ensure the intake side faces the primary dust source. For a thorough guide on air scrubber setup and operation, see our full air scrubber usage guide.

How Does the PureAiro 770 Compare to Other Air Scrubber Brands?

Use the table below to compare the PureAiro HEPA Max 770 against the most common alternatives in the restoration and construction air scrubber category. The three units represent different sizing tiers: the Vevor 550 CFM air scrubber for small jobs, the PureAiro 770 for medium jobs, and the PuriSystems 900 for large commercial spaces.

The PureAiro 770 occupies a middle position in the market that works well for the most common restoration job sizes: 800 to 1,200-square-foot water damage and mold jobs. If your typical job is under 500 square feet, a 550 CFM unit saves $100 to $150 on the unit purchase. If your typical job exceeds 1,200 square feet regularly, the 900 CFM class is the better investment. For more options across price points, check our detailed air scrubber brands comparison guide.

How Long Do Filters Last on the PureAiro HEPA Max 770?

Filter lifespan on the PureAiro 770 varies dramatically by job type. The washable pre-filter needs cleaning or rinsing every 8 to 24 hours of runtime on heavy dust jobs. In drywall sanding or concrete grinding environments, the pre-filter can load visibly within a single workday. In moderate dust environments like water damage restoration, the pre-filter may last 2 to 3 days between cleanings.

The activated carbon filter typically lasts 3 to 6 months depending on VOC concentrations and odor levels at the job site. Carbon filters used in sewage remediation or heavy chemical odor environments saturate faster. The filter change indicator on the control panel measures pressure drop across the HEPA stage only, not carbon saturation. Replace the carbon filter when odors return to the exhaust air stream.

The True HEPA filter lasts longest, typically 12 to 18 months under normal restoration use. The filter change indicator light illuminates when the pressure drop across the HEPA filter reaches a threshold that reduces airflow below effective levels. Continuing to use a loaded HEPA filter forces the motor to work harder, increases amp draw, reduces CFM output, and shortens motor life. A replacement HEPA filter for the PureAiro 770 costs between $120 and $160, making filter pressure management a direct equipment cost issue.

What Is the Noise Level of the PureAiro HEPA Max 770 at Each Speed?

The PureAiro 770 produces approximately 62 dB at low speed, 68 dB at medium speed, and 74 dB at high speed measured at 3 feet from the unit. These are sound pressure levels typical of commercial air scrubbers in this CFM class. For context, 62 dB is comparable to normal conversation. 74 dB is comparable to a vacuum cleaner operating in the same room.

These noise levels make the PureAiro 770 unsuitable for occupied residential spaces during operation. Restoration contractors typically run these units in unoccupied containment areas, during working hours with hearing protection, or in sealed areas where noise transmission is blocked by containment barriers. The unit is not designed or marketed for bedroom use, living areas, or any occupied residential setting.

If you need an air scrubber for an occupied space, look for units with sound-dampened housings and lower-speed operation modes that stay below 55 dB. The cost comparison between purchase and rental often favors buying when you need a unit that operates at lower noise levels for occupied-space work.

Can the PureAiro 770 Be Used for Asbestos or Lead Abatement?

The PureAiro HEPA Max 770 can be used as a negative air machine in asbestos and lead abatement containment areas, provided the True HEPA filter is certified and the unit passes a DOP (Dispersed Oil Particulate) test confirming 99.97% efficiency at 0.3 microns. The EPA requires HEPA-filtered negative air machines for asbestos abatement under 40 CFR Part 61 Subpart M (NESHAP).

However, not all insurance carriers and regulatory inspectors accept every HEPA air scrubber for regulated abatement work without documentation. Before deploying the PureAiro 770 on an abatement project, confirm the following: the HEPA filter has a manufacturer certification label, the unit has been DOP-tested within the past 12 months if required by your state regulations, and the specific job specifications do not require a different class of negative air machine.

For professional abatement contractors, it is common practice to use dedicated negative air machines with documented test histories rather than general-purpose restoration air scrubbers, even if both use True HEPA filters. For more detail on selecting equipment for hazardous material work, see our guide on the best air scrubbers for asbestos abatement.

What Are the Most Common Problems With the PureAiro HEPA Max 770?

Contractor reports identify three recurring issues with the PureAiro 770. The first is premature filter loading when the pre-filter is not cleaned daily on heavy dust jobs. This happens because the washable pre-filter has a finite dirt-holding capacity. Once loaded, the pressure drop cascades to the more expensive HEPA filter, shortening its life and increasing total filter cost.

The solution is simple. Rinse the pre-filter at the end of every shift on heavy dust jobs, let it dry overnight, and reinstall it in the morning. Contractors who skip this step report replacing the $150 HEPA filter twice as often as those who maintain the pre-filter daily.

The second issue is motor overheating when the unit runs continuously at high speed for weeks in hot environments. The PureAiro 770 uses a thermally protected PSC motor rated for continuous duty, but ambient temperatures above 100 degrees Fahrenheit combined with high-speed operation reduce motor cooling efficiency. The thermal protection may trip, shutting down the unit until it cools.

Prevent this by running the unit at medium speed during the hottest portion of the workday and maximizing airflow through the unit by keeping intake and exhaust paths unobstructed. Position the unit away from direct sunlight and other heat sources on the job site.

The third issue is inadequate negative pressure when containment is poorly sealed. The PureAiro 770 cannot overcome large air leaks. A single unsealed doorway gap of 6 inches by 0.25 inches can reduce containment pressure differential by 50% or more. Seal all penetrations in the containment barrier before relying on the air scrubber for pressure control.

What Is the Cost of the PureAiro HEPA Max 770 Compared to Renting?

The PureAiro HEPA Max 770 costs approximately $650 to $800 for the unit, depending on the retailer and whether filters are included in the purchase price. Rental rates for similar-capacity air scrubbers range from $50 to $75 per day or $150 to $250 per week from equipment rental companies. At these rates, the purchase breaks even after approximately 10 to 15 rental days or 3 to 5 weekly rental periods.

For restoration contractors who use an air scrubber on at least one job per month, purchasing the PureAiro 770 generates positive return on investment within the first quarter of ownership compared to renting. The financial case for ownership strengthens when you factor in transport time to and from rental yards and the availability guarantee of having the equipment on your truck when a water damage call comes in at 10 PM.

First-year total cost of ownership for a purchased PureAiro 770 used heavily across 150 job days includes the unit purchase at $700, two carbon filter replacements at $100 total, one HEPA replacement at $140, and approximately $72 in electricity costs. That totals roughly $1,012. Renting an equivalent unit for 150 days at $50 per day would cost $7,500. For a full breakdown of purchase, rental, and installation cost comparisons across the air scrubber category, see our complete air scrubber cost guide.

How Does the PureAiro 770 Handle Different Types of Job Site Contaminants?

The three-stage filtration system handles different contaminant types in sequence. The pre-filter captures large visible dust, construction debris, carpet fibers, and particles above approximately 10 microns. This stage prevents the more expensive downstream filters from loading prematurely with coarse material that does not require HEPA-level capture.

The activated carbon filter adsorbs volatile organic compounds, smoke odors, sewage odors, and chemical fumes. This happens because activated carbon has a massive internal surface area of approximately 500 to 1,000 square meters per gram, and VOC molecules physically adhere to this surface through van der Waals forces. The carbon filter does not capture particles. It only addresses gaseous contaminants.

The True HEPA filter captures fine particulate matter including mold spores at 1 to 30 microns, bacteria at 0.3 to 10 microns, lead dust at 0.1 to 10 microns, and asbestos fibers at 0.7 to 90 microns in length. The HEPA media uses a combination of interception, impaction, and diffusion capture mechanisms. Particles at 0.3 microns are the hardest to capture because they are too large for diffusion and too small for interception, which is why the 99.97% at 0.3 microns standard represents the worst-case efficiency for a True HEPA filter.

How Do You Stack Multiple PureAiro 770 Units Correctly?

The PureAiro HEPA Max 770 has molded stacking recesses on the top housing that accept the feet of an identical unit placed above it. Stack up to three units vertically, with the bottom unit’s exhaust pointing away from any wall or obstruction. Never stack more than three units high. The combined weight of three units is 135 pounds, and the bottom housing is rated for this load.

When stacking units for increased negative pressure on large containment areas, run all units at the same fan speed to balance airflow across the stack. Connect each unit’s exhaust to a common 12-inch duct manifold using a wye fitting, or run separate exhaust ducts for each unit depending on the containment layout. Stacked units in recirculating mode provide approximately additive CFM: two units at 550 CFM medium speed deliver roughly 1,100 CFM total cleaning capacity.

For very large spaces over 2,000 square feet, spreading multiple units around the containment perimeter provides better air mixing and more uniform filtration than stacking all units in one location. Place units at opposite ends of the space and direct airflow to create a sweeping pattern that moves contaminated air toward the scrubber intakes.

Does the PureAiro 770 Produce Ozone?

No. The PureAiro HEPA Max 770 does not produce ozone. It uses mechanical filtration only: a pre-filter, an activated carbon filter, and a True HEPA filter. There is no UV-C lamp, no ionizer, no electrostatic precipitator, and no photocatalytic oxidation stage that could generate ozone as a byproduct.

This is important for restoration environments because ozone can react with VOCs from building materials and cleaning products to form secondary pollutants including formaldehyde and ultrafine particles. Ozone at concentrations above 0.050 ppm also irritates the respiratory system. The PureAiro 770 avoids all of these concerns by relying entirely on mechanical filtration with no electronic air cleaning components.

If you are comparing this unit against air scrubbers that include UV-C or ionization stages, verify the CARB certification status of any electronic air cleaning device before deploying it in an occupied or soon-to-be-occupied space. The PureAiro 770’s mechanical-only design eliminates this compliance concern entirely.

What Maintenance Does the PureAiro HEPA Max 770 Require?

Daily maintenance consists of inspecting and cleaning the pre-filter. On heavy dust jobs, remove the pre-filter, rinse it with water, and allow it to dry before reinstalling. Check the intake and exhaust grilles for debris accumulation and clear any obstructions.

Weekly maintenance includes checking all duct connections for secure attachment and inspecting ducting for tears, pinholes, or collapsed sections. Check the filter change indicator on the control panel. If illuminated, the HEPA filter has reached its pressure drop limit and needs replacement.

Monthly maintenance involves opening the filter access panel and inspecting the activated carbon filter for visible loading or odor breakthrough. Check the power cord and auxiliary outlet for damage. Verify that the control panel switches and indicator lights function correctly. Run the unit at each speed setting and listen for any unusual vibration, bearing noise, or motor hum that would indicate a developing mechanical issue.

Is the PureAiro HEPA Max 770 a Good Choice for Water Damage Restoration?

Yes, the PureAiro 770 is well-suited for Category 1 and Category 2 water damage restoration jobs up to 1,200 square feet. During water damage work, the air scrubber runs alongside air movers and dehumidifiers to capture airborne particulates including disturbed dust, mold spores that become airborne during demolition, and particulate matter released from wet building materials as they are removed.

For Category 3 water damage involving sewage or contaminated flood water, the air scrubber should be run in negative air pressure configuration with exhaust ducted outside to prevent aerosolized contaminants from spreading to clean areas of the structure. The activated carbon filter provides additional odor control for sewage-related VOCs during Category 3 jobs.

Position the PureAiro 770 in the containment area with the intake facing the primary work zone. Run the unit continuously throughout demolition, drying, and reconstruction phases. Do not turn off the scrubber when leaving the job site at the end of the day during active mold remediation or when demolition-generated dust has not yet settled.

What Is the Warranty on the PureAiro HEPA Max 770?

ALORAIR provides a 5-year limited warranty on the PureAiro HEPA Max 770 covering defects in materials and workmanship. The warranty covers the motor, housing, control panel, and internal components. Filters are consumable items and are not covered under warranty. The warranty is valid for the original purchaser with proof of purchase from an authorized ALORAIR dealer.

Warranty claims require contacting ALORAIR technical support with the unit serial number and a description of the defect. ALORAIR may repair or replace the unit at their discretion. The warranty does not cover damage from misuse, unauthorized modifications, use of non-genuine filters that cause motor damage, or normal wear and tear on components like switches and indicator lights.

How Does the PureAiro 770 Compare to a Residential HEPA Air Purifier?

An air scrubber like the PureAiro 770 and a residential HEPA air purifier serve fundamentally different purposes, even though both use True HEPA filtration. The PureAiro 770 moves 770 CFM at maximum speed, while a top-performing residential unit like the Coway Airmega 400 delivers approximately 400 CFM smoke CADR with noise levels around 22 dB at sleep mode.

The residential unit is engineered for quiet continuous operation in occupied living spaces. The air scrubber is engineered for maximum particle removal rate in unoccupied job sites. Using a PureAiro 770 in a living room would be excessively loud at 62 to 74 dB. Using a residential air purifier on a drywall sanding job would destroy the filters in hours and fail to achieve the 4+ ACH needed for effective dust control.

Buy the PureAiro 770 if you are a contractor performing restoration, remediation, or construction work. Buy a residential HEPA air purifier if you need clean air in a home, apartment, office, or any occupied space where noise levels below 50 dB are required.

What Ducting Accessories Are Needed for the PureAiro 770?

The PureAiro 770 requires 12-inch diameter layflat ducting for negative air pressure setups. Standard restoration-grade 12-inch layflat ducting is sold in 25-foot lengths and connects to the unit’s exhaust outlet with an integrated cuff or a separate duct clamp. For intake ducting, the same 12-inch layflat duct connects to either of the two intake ports on the unit.

Additional accessories to consider include duct clamps for secure connection at both ends, a duct manifold or wye fitting when stacking multiple units, and a window vent kit for the exhaust termination point. A window vent kit with a 12-inch duct flange allows clean exhaust termination through a window without pulling the duct loose or allowing unfiltered air backflow through the window opening.

Store layflat ducting clean and dry between jobs. Wet or mold-contaminated ducting reintroduces contamination to the next job site. Replace ducting that shows visible mold growth, tears, or pinholes rather than attempting to clean and reuse heavily contaminated duct material.

Can the PureAiro 770 Run Continuously for Days or Weeks?

Yes, the PureAiro HEPA Max 770 is rated for continuous duty operation. The PSC motor is designed to run 24 hours per day for extended periods without duty cycle limitations. Restoration contractors routinely run these units continuously for 3 to 7 days during water damage jobs and for weeks during large-scale mold remediation projects.

Continuous operation does increase filter loading rates and electricity consumption. At 3.5 amps and 115 volts, the unit draws approximately 402 watts at high speed. Continuous 24/7 operation at high speed for 30 days uses approximately 290 kilowatt-hours of electricity. At the national average electricity rate of 13 cents per kilowatt-hour, that costs roughly $38 per month of continuous operation.

The only operational limit during continuous use is filter maintenance. Check and clean the pre-filter daily. Monitor the filter change indicator for HEPA loading. Running a heavily loaded HEPA filter continuously for extended periods increases motor amp draw, reduces CFM output, and can eventually cause motor overheating if the thermal protection system does not intervene first.

What Are the Dimensions and Portability Features?

The PureAiro 770 measures 20.5 inches wide, 20.5 inches deep, and 23.5 inches tall. At 45 pounds, it is portable by a single person using the molded carry handles on both sides of the housing. The stacked design allows two units to fit in the same truck footprint as one unit with a second unit strapped on top.

The unit ships in a single box measuring approximately 22 inches by 22 inches by 25 inches and weighing 52 pounds with packaging. Filters may ship pre-installed or separately depending on the retailer configuration. The compact footprint means the PureAiro 770 fits through standard doorways and into crawl space access points without disassembly, although the 45-pound weight becomes noticeable when carrying the unit up multiple flights of stairs or across long distances on a job site.

Where Can I Buy the PureAiro HEPA Max 770 and Replacement Filters?

The PureAiro HEPA Max 770 is available through Amazon and authorized ALORAIR dealers. Prices range from $650 to $800 for the complete unit including filters, depending on the seller and whether the unit is on promotion. Replacement filters are available from the same retailers.

When purchasing replacement filters, buy genuine ALORAIR-branded filters rather than third-party alternatives. Third-party filters may not seal correctly within the filter housing, leading to filter bypass where unfiltered air leaks around the filter edges instead of passing through the media. Filter bypass defeats the HEPA filtration entirely and is undetectable without a particle counter downstream of the filter.

For contractors running multiple units, consider keeping at least one complete spare filter set on the truck: one pre-filter, one carbon filter, and one HEPA filter. A job site that runs out of HEPA filtration halfway through mold remediation cannot continue until replacement filters arrive.

The PureAiro HEPA Max 770 delivers genuine 770 CFM True HEPA filtration in a portable, stackable package at a price point that pays for itself against rental costs within 10 to 15 job days. Match the unit to your actual cubic volume requirements using the ACH tables above, maintain the pre-filter daily, and you will get reliable performance across water damage, mold remediation, and construction dust control applications for years of continuous job site use.