Filter-MonsterBranded Activated Carbon Replacement Compatible with IQAir GC MultiGas Cartridges

Filter seems to perform well however it's smaller than IQ air branded filters and I had to shim my filter on all 4 sides with cardboard to prevent one of the sides from slipping down. I'll probably buy IQ air filters next time because of this.

Swapped out all of the filters at once for brand new ones. Ran it outside for 15 minutes to start with to let it all air out.Turns out that with the GC unit, it just filters through the HEPA filter first and then through these filters then outputs right after that. Even with the tube shaped filters over these units, it still gave off a distinct carbon odor 30 minutes (Update: now 2 days) after running at speed 6. That should not happen.These are made in China anyway but the seller has no idea how or why it would do this. One customer review here said after 7 days it still did this for them and left a review speaking about it as well. The point of a house filter is to filter the intake air and output cleaner air. Not be outputting activated carbon air directly. Why there is nothing that filters this is in part a design flaw but also the filters themselves should not still be doing that 30 minutes (edit: now 2 days) after running on speed 6 either.A few minutes at most after traveling across the sea and being bumped around a lot maybe but the point of these is to output fresh air. Maybe the official OEM ones will do so instead? Or maybe a different brand? No idea but this isn't exactly what was expected here.Spoke with the seller, they basically said return it and there might be a 15% fee. Amazon seems to disagree with that. To give the sellers SOME credit, when we reached out to IQAir, they basically said you can just install and use. Then when we scratched our heads and asked why it still smells, they said oh, run for at least 24 hours. We asked how long we needed to run it for and they did not have an answer.In short, the GC model seems like a very poorly designed product when there are basically no HEPA filters after the carbon dust generating filters! That all said, this product still smells terrible even after running it for 2 days at max speed.

these charcoal cartridges are a perfectly affordable alternative to the IQAIR name-brand units. They fit perfectly and weigh the same meaning they have the same quantity of charcoal.

It didn't seat completely flat in the housing like the OEM does. I couldn't hear an air leak, and it looked like it probably still had a good seal. Nevertheless, I cut some styrofoam to get a better fit. I just got one each for HealthPro Plus and GC Multigas, and it's the same issue for both respective parts (two separate parts, first/bottom filter). It annoyed me just enough that I might pay the extra for OEM next time.Weight and look is good; seems like similar to OEM quality at least at a glance. Filtration is great per a Dylos laser air quality monitor with all non-OEM filters. Is it exactly as good as OEM? I don't know without doing extensive testing, but it's great filtration.

Just a word of caution. They don't fit older Multigas systems that use the old "keyhold" attachment method. You'll need adapter plates from IQAir.These make my air smell like burning marshmallows. It's not the unit itself burning. I've tested with and without the filters and it's definitely the filters themselves and not the unit. I checked to see if it was overheating with the filters in place and it wasn't. They also don't seem to remove the smell of smoke in the air. They just add to it. I ran them for about a week on high and the smell never got any better so I returned them.