Filter-Monster - Replacement HEPA Filter Kit with Pre-Filters - Compatible with Austin Air Healthmate FR400 Air Purifier Filter and Austin Air Models HM400, HM402, HM405, HM410, and HM450

Fit perfectly into my Austin Air Health Mate unit. I placed the filter in 1st. Then I linned up BOTH pre-filters, bent them into a circle and nudged them into the tight space around the filter. I began nudging one end a few inches, worked my way around, doubled up the ends and nudged them in. I repeated this as I'd push the filter to the opposite side by a few hairs but just enough to keep nudging a few inches at a time. I was able to get my fingers into the corner spaces to do the most nudging downward till both filters were fully inside the unit and surrounding the new filter. I placed the black filter on top because my unit is black and the tiny air holes tend to show the filter a bit so may as well match. For white or off-white units, place the white prefilter towards the outside of the unit if also using the black prefilter. So, I've been running my unit 24-7 for one week with this new label filter. I'm very satisfied as evidence by not needing to dust up fine dust off my black carved out headboard. I live near the freeway so fine particles and dust is an issue even with screens on my windows. Plus I have two awesome dogs who sleep in my bedroom. I suffer from alergies so good air quality is critical, as it should be for everyone. Overall, I'm very satisfied with this filter and super happy to save a lot of money. Brand name filters are overpriced just because a manufacturer has their own models. I'm so glad there's finally some competition and more people can afford better air quality, for their health and well being.

I ordered this filter for my Austin Air PET machine. I hadn't replaced the filter in a while as the price of the filters was absolutely unreasonable. When I first bought the machine the filters were about $200 now they go for $500!! This filter was a great price and works perfectly! Quality of air has improved amd I definitely noticed a difference. Definitely recommended!!

Great filter and pre filters! I’ve had this filter for years. The filter is supposed to be changed every 5 years. I’ve used this daily for years. This is the first filter change and it makes all the difference. The old filter was disgusting. So glad to be able to find the right filter after all these years. This is a workhorse.

Filter is a bit heavy. may need help lifting the old filter out and putting in the new one. Serious filter however. And they do last a few years.

I heard a lot of negative reviews for this filter , but it fits well , extra carbon liner is a good plus, and it is a great price and does the job