Expert Rating

IQAir is a well respected indoor air quality educational partner of the American Lung Association, backed by the ALA’s president as a company that shares the same passion for protecting the public from polluted indoor air, and the IQAir GC Multigas Air Purifier sets a standard reflective of that commitment with its industry-leading, safe, mechanical particle filtration. Read more about best air purifier for mold here?

Our review of the GC Multigas Air Purifier, IQAir’s flagship machine for multiple chemical sensitives, volatile organic compounds, gas, and odor filtration, demonstrates superior consumer air purification that straddles the line between industrial and retail machines. Check out our full IQAir GC Multigas Air Purifier Review after the break.


WHY IT’S A TOP PICK: One of the best air purifiers for VOCs and smoke that consumers can buy.

Price: $1299 on Amazon
Available: Now
Model: GC Multigas

Summary: The IQAir GC Multigas Air Purifier is a phenomenal, pure-mechanical air purifier that uses a medical-grade HEPA and multi-cylinder activated carbon filters to remove allergens, dust, pollen, gases, smoke and VOCs from the air.

What We Liked

  • Simple control elements that remove guesswork
  • No ozone output
  • Heavy-duty carbon filtration
  • Sturdy machine (you can easily see why this unit costs $1299)

What We Didn’t

  • A little too bulky – users unable to perform their own maintenance may require assistance
  • No smart features – control only available at the machine itself

IQAir GC Multigas Air Purifier Specifications

IQAir GC Multigas Air Purifier
Max Coverage1125 Sq Ft
Weight29 lb
Max Noise63 dB
Max Electrical Consumption400 Watts
Warranty10 year
Buy Now


Dressed in attractive yet professional packaging, the IQAir GC Multigas Air Purifier comes well protected in several layers of plastic wrap and Styrofoam with its user manual, quick-start instructions, testing certifications, and authenticity information at the top of the box. Once removed from the shipping container, the air purifier makes a bold statement that other machines will struggle to compete with. It looks like something you would see in a doctor’s office – not necessarily a bad thing if you value indoor air quality. Blue support struts run vertically along two sides of the purification structure and can be snapped out of place to remove filter housing substructures within the unit. Caster wheels come with the unit and can be installed to facilitate easier relocation of the very large machine.

IQAir GC Multigas Air Purifier
Want the best air purifier for smoke and VOC removal in your home? This is one of the best.

IQAir’s GC Multigas Air Purifier is designed for large areas requiring a powerful purifier meant to remove the most dense smoke, gas, and VOCs from air. Meant for rooms as large as 1,125 sq ft, the machine pulls air through a proprietary HyperHEPA IQAir GC Multigas pre-filter (located at the bottom of the unit in a removable tray), upward through multiple activated carbon cylinders which remove VOCs and odors, a secondary stage of the carbon filters which treats via chemisorption to destroy harmful chemicals in the air like formaldehyde, and finally through a post-filter sleeve which prevents activated carbon particulate from escaping from the air that’s returned to the treated environment.

Watch this video of an IQAir’s president demonstrating the effectiveness of a HealthPro Plus model (a step below the GC Multigas with respect to its ability to filter smoke) with smoke grenades:

The purifier measures 28″ (h) x 16″ (w) x 15″ (d) and can fit comfortably in most living spaces although, we recommend having an area picked out prior to setting up the purifier. In our testing, we found that our participants preferred using this machine in either a large bedroom, or kitchen.

It’s a relatively lightweight machine compared to other comparable air purifiers that we’ve reviewed (29 lbs vs Austin Air’s Healthmate at 45 lbs), but because of its bulkiness most of that benefit is lost.

IQAir GC Multigas Air Purifier - Filter Locks
Side locking mechanisms secure filter housings.

Filter replacement is relatively simple. The blue struts along each side of the machine snap out of place to remove the top cover housing the activated carbon filters and unlock the bottom tray with the HyperHEPA filter. Expect approximately 7000 hours of use (nearly one year) from filter assemblies prior to needing to replace. IQAir GC Series replacement filters for this machine and other IQAir models can be found on its website.

Total Estimated Annual Maintenance and Operating Costs: $656

IQAir GC Multigas Air Purifier cartridges (the cylindrical activated carbon filters) need to be replaced at the same time as the post-filter sleeves (the white wraps around the cylindrical cartridges), and the HyerHEPA filter to ensure that the air purification process isn’t inhibited by a bottleneck.

IQAir GC Multigas Air Purifier - Activated Carbon Cartridges
Four activated carbon and chemisorption filters treat polluted air – the nearest to industrial-grade for consumers that we’ve seen
IQAir GC Multigas Air Purifier - HyperHEPA Filter
IQAir’s HyperHEPA filter is a medical-grade filter which adsorps particulate like dust, pollen, and pet dander. The GC Multigas is the first machine we’ve seen that uses a HEPA filter as its pre-filter.


The GC Multigas user interface is simple to use and offers a variety of options for scheduling air purification cycles. We’ve taken shots below of some of the control screens, but if you’re looking for a more in-depth solution to a control issue we suggest you check out the IQAir GC Multigas manual here.

IQAir GC Multigas Air Purifier - Airflow Speed Setting
A simple control interface that allows airflow speed setting adjustments.
IQAir GC Multigas Air Purifier - Automatic Timer Setting
The interface allows users to set an automatic timer for a more hands-off option.
IQAir GC Multigas Air Purifier - Automatic Schedule Setting
Scheduling allows users to set up a weekly run time so that they can go about their regular lives and interact with the machine less often.
IQAir GC Multigas Air Purifier - Standby
The control unit screen when the machine is powered down and awaiting a command either from a scheduled setting, or manually.

The unit’s physical interface is straightforward. A power button does what it should and activates/deactivates the unit when depressed. A selection button to the right of the power button allows users to navigate through menus. The menu button returns users to the previous menu. And the enter button helps users enter and select desired settings, or pre-programmed control functions.

To the right of the LCD display, a diagram of the unit displays filter life based on LED color indicators (green, orange, and red representing three levels of performance).

IQAir HealthPro Plus vs GC Multigas

As demonstrated in the video above, IQAir’s HealthPro Plus unit is very capable of removing smoke from an environment – so what’s the big difference between these two IQAir products?

It’s the activated carbon filter assemblies, mostly. The GC Multigas is a beast when it comes to adsorbing toxic chemicals and volatile organic compounds from the air it’s treating. I’ve worked in industrial settings that require massive air adsorbers to treat incoming air to electrical control rooms and I can tell you without hesitating, this thing’s assembly is the closest I’ve seen to an industrial machine. If you need serious at home, or office, air purification that’s meant for everything else plus VOCs and smoke, the GC Multigas is the unit you want.

Wrap Up

Overall, the IQ Air GC Multigas air purifier  is an excellent machine that deserves a place among some of the highest performing, consumer-grade air purifiers on the market today. We highly recommend this purifier for family rooms, large bedrooms, or kitchens that want an air cleaner for medical-grade control of allergens, dust, pollen, gases, and VOCs. This machine also works quite well in doctor offices.

Expect to spend approximately $376 every 7,000 hours on filter replacements. Energy consumption varies based on fan speed setting, but expect consumption to fall around 400 Watts. At 7,000 hours, expect electrical consumption to cost approximately $280 per year (using a $0.10 per kWh base figure).

IQAir manufacturers some of the best air purifiers on the market, testing each purifier independently before shipping from the manufacturing facility to ensure that systems meet stringent air purification specifications.

The IQAir GC Multigas Air Purifier is a Gadget Review top pick for any consumer looking to buy a large, powerful, and effective air purifier for their home, or office.

Related Articles:

Reader Rating11 Votes3.7
Expert Rating
Bottom Line

Christen Costa

Grew up back East, got sick of the cold and headed West. Since I was small I have been pushing buttons - both electronic and human. With an insatiable need for tech I thought "why not start a blog focusing on technology, and use my dislikes and likes to post on gadgets."

Related Articles


  1. The one thing I don’t like is this unit blows the air sideways out 360 degrees around the unit at 28 inches off the floor and draws it in at floor level. I wish it could blow it up to the ceiling and spread out over the room and back down to the floor then back to the unit. In my bedroom, it will have to go in the corner, so it will only have 180 degrees to blow into the room and the other 180 degrees will blow against the wall. I wonder if it could be mounted up near the ceiling and have a duct from the floor to the base of the unit. I am trying to figure out how to get the air more into the room. Problem with bedrooms is there is a large bed in the middle of the floor. And this unit seems to be designed to have to be mounted on a pedestal in the middle of the floor where the bed typically is located. I don’t understand how to get the airflow right through this unit to cover the bedroom evenly. I still think the air should go into the bottom and blow straight out the top. Perhaps the top cover will come off so it can blow air up and out into the room.

  2. According to the manufacture specs, this unit uses 215 watts at full power, not 400! It has 6 speeds. Most likely speed for a master bedroom will be at speed 3 or less. At speed 3, it only uses 92 watts. Also, a lot of people will only need to run it about 10 hours a day, for example, program for it to come on one to two hours before bedtime and turn off when you get up in the morning. So that cuts the number of hours per year in half, down to around 3500 hours per year, not 7000 hours per year. That puts this unit’s electricity consumption down to around $45 per year or about $4 per month for many people. And filter life will probably last 2 years at these settings. That is, 2 years for the expensive filters and 1 year for the much cheaper HEPA pre-filter. I am thinking total cost closer to about $300 per year average over 10 years which includes the original price of the unit plus the price of all of the filter changes on schedule plus electricity. I have not yet bought one, but I am strongly considering it if I can get over the $1300 plus taxes price shock to buy. This unit calculates the number of cu feet of air going through it over time and based on that alone, tells you when the filters may be due for replacement. It also tells you how many hours are left on each and every filter for the current selected speed.

Leave a Reply

Your email address will not be published. Required fields are marked *

Final Score