Air Scrubber vs. Air Purifier: Which One Do You Actually Need?
Plan a big home project and you'll quickly run into two machines that sound like the same thing: the air scrubber and the air purifier. Mix them up, and renovation dust can end up drifting through the whole house.
They can even use the same kind of filter. The difference is the job each one is built to do.
You want cleaner everyday air in the rooms you live in, like a bedroom or living room.
You're containing dust from a big project in a sealed-off work area, like tearing out a basement wall or sanding floors.
Small repairs often need neither machine as the main defense. Sealing off the work, catching dust at the source and cleaning up come first.
Air Scrubber Vs. Air Purifier At A Glance
| Air purifier | Portable HEPA air scrubber | |
|---|---|---|
| Built for | Cleaner everyday air | Containing dust during a project or cleanup |
| Where it runs | A bedroom, living room or other room you use | Inside a sealed-off work area |
| How it's sized | By room size and CADR | By the work area's size, how tightly it's sealed and the duct setup |
| Setup | Sits in the room | Can be ducted to vent outdoors |
| Filters | HEPA, and some add activated carbon | HEPA |
What's An Air Purifier?
An air purifier is a freestanding machine that pulls room air through its filters and sends cleaner air back into the same room. It's sized to the room by its Clean Air Delivery Rate (CADR), which tells you how much filtered air it puts out.
A HEPA filter catches particles like dust, pollen and pet dander. Some purifiers also add activated carbon, which handles gases and odors a HEPA filter can't catch.
What's An Air Scrubber?
An air scrubber is a heavy-duty portable machine with a HEPA filter, built for job sites like mold cleanup and big renovations. A few other products borrow the name too (more on those below).
A scrubber can be set up two ways:
For a big job, have a rental shop or a mold-cleanup pro size and set it up.
When You Need Both
Some projects call for both machines, either at the same time or one after the other.
Not Every "Air Scrubber" Is The Same Machine
The name "air scrubber" shows up on products that work in very different ways. So check how a machine actually works before you compare it with anything else.
Some "active" air cleaners release ions, and ozone generators make ozone on purpose. Ozone can react with chemicals indoors and form irritating by-products.
No federal agency has approved ozone generators for rooms people are in. A California Air Resources Board listing means an electronic model meets California's ozone limit, not that it cleans the air well.
Before You Pull Air Out Of A Room
Blowing air out of the house can lower the air pressure inside. That can pull exhaust fumes from a gas water heater, furnace or fireplace back down the chimney or vent and into your home.
Have an HVAC or cleanup professional check the setup when fuel-burning equipment is nearby. Carbon monoxide alarms are an important backup, but they can't stop fumes from being pulled back in.
If work in a home built before 1978 will disturb paint, use lead-safe work practices.
Mold: What Air Cleaning Can And Can't Do
Air cleaning isn't mold remediation. Fixing the moisture source and cleaning or removing moldy materials come first, and mold cleanup guidance covers how.
Get professional help for mold over about 10 sq ft, major water damage or health concerns at home.
During cleanup, a HEPA machine catches spores floating in the air that pass through it. If damp air keeps the problem going, a dehumidifier can help once leaks are fixed.
Picking A Purifier For Everyday Air
Once the work is done, the right purifier depends on what's left in the air.
Air Scrubber And Air Purifier FAQ
Can An Air Purifier Do The Job Of An Air Scrubber?
Not during a big, dusty project. A purifier cleans the air in one room, but it can't keep dust from spreading out of the work area.
It's still useful for the dust left floating around once the work area is sealed off and cleaned up.
Can An Air Scrubber Be Used As An Everyday Air Purifier?
Yes, it can filter room air, but it's built for job sites, not bedrooms and living rooms. For everyday air, a purifier sized to the room by its CADR is the better fit.
Do Air Scrubbers Remove Mold?
No. A HEPA scrubber catches mold spores floating in the air during cleanup, but the mold itself still has to be cleaned up or removed and the moisture fixed.
Is It Safe To Be In A Room With An Air Scrubber?
Yes, as long as it's a filter-only HEPA scrubber. It just filters the air and doesn't add ozone or chemicals to it.
Two exceptions: be wary of machines that make ozone or use ions or other "active" treatments. And if it's set up as an exhaust fan near a gas water heater, furnace or fireplace, have the setup checked first.
Do Air Scrubbers Really Work?
Yes, a HEPA scrubber captures particles from the air that passes through its filters. On a sealed-off project, how well it works also depends on how well the area is sealed, how the machine is sized and how the ducts are set up.
Where Should An Air Scrubber Go?
When it's just filtering the air, it goes inside the work area. When it's set up as an exhaust fan, its spot depends on how the area is sealed and where the duct can run.