Altec Filters 6 Activated Carbon Pre-Filters Compatible With HPA200 Air Purifier, Premium Quality Replacement PreFilters HW HPA204 HPA250B Filter A By Altec Filters (6 Pack)

Perfect thickness

Just fine

The last time I bought pre-filters there was one size that had to be cut to fit. It was doable but time consuming because of the difficulty in keeping the cut straight. It took only a few minutes to pop out the old filter and put a new pre-cut filter in.

Excellent filters. Much better than the ones I had before which claimed to be charcoal but probably weren't. These are the real deal. They fit perfectly. Highly recommended.

These are much thicker than the roll you buy at stores. It works vastly better and no need to cut them. It's a huge pain having to take the roll out and cut the others. I never cut them right so it never fit completely. Now they fit correctly and have nice right edges because these are precut. I highly recommend them. I bought two bunches already because I change my pre filters once a month because of the dusty area I live in.

I liked this filters , I used them for my face mask that I have to wear and works perfect,

Fits well and works with my HPA 200 air purifiers. Replace every three months.

These are very sturdy and fit precisely as they should, like the ones that came with my Honeywell air purifier when I bought it.

This item is full of charcoal & thickness is very good. So happy I bought this item this item.I now have all my charcoal filters on the same schedule, to do them all at once!One of my fan requires a filter longer than these sheets - for that one, I just cut & joined 2 pieces & because of the good quality of these filters, it has worked great.

As I just received and installed these it is a little early to give a true rating. Filters fit my Honeywell like originals, pre-filter was folded but then so are Honeywell replacements, hepa filters look identical with the exception of wording and ink colour. If these prove to work as well as name brand, I must say that they are substantially less expensive then name brand. The biggest comment I can make to any curious customers is that the use of hepa quality air purifiers with carbon treated pre-filters keep my home smelling fresher and almost dust free and has reduced asthma attacks to RARE not frequent, your health is worth the expense.

I used these as vent filters and they are a good thickness that still allows good airflow to come through, but they seem to do nothing for filtering cigarette smoke, which was my reason for buying them.

I have an air purifier Levoit, and you can't buy carbon filters for. You have to buy filter assembly, when you need just a carbon filter. So this carbon filter fit my air purifier, all I have to do cut a strip and save money. $ 35.00 vs $ 19.99.

These pre-carbon filters fit perfectly on my air-purifier and appear to be working great. They're also thicker than the official ones, which should result in longer lasting smell. The only downfall of these filters is the price, however, the ease of use more than makes up for it. Overall impressive filters that seem to work fine.