Filter - Monster Replacement Filter for Austin Air Bedroom Machine (HM402) with Pre-Filter

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.

The foam was not thick enough to seal on the top of the filter due to interference with the fan nuts on my 400. I tore the cardboard and gasket from my old filter and used it at the top. Then flipped the filter over to use the thinner gasket on the new at the top. Worked perfect and great seal.

Great kit value with main filter and both types of pre filters.

I see a lot of people are cutting the prefilter. Do NOT do this. The prefilter was intended to go around the square metal frame, not the round internal filter. A quick installation search shows this method.Overall great product for half the price. Will buy again ... in 5 years!

i was surprised at the heavy duty quality of this air filter. very similar to oem, but at a better price. i would recommend this air filter.

We’ve had both the austinair brand filter and this one.As a household with 5 dogs and 3 cats a purifier is a must.Our name brand needed replacing after 3 years, not the 5 which I assume is due to all the pets and hard wood flooring throughout the house.This brand has provided the identical filtering as the name brand and for the same amount of time.This purchase was just made but I’m assuming it’ll hold up like our prior purchase here and we’ll be good another 3 years.Excellent product and price.

replaced my original filter after 5 years of use. this filter is a good price, arrived quickly and fit well. But there is an odor that is unacceptable and was not there before changing the filter. I ran it for 60 days and the odor did not stop. I am throwing it in the trash and recommend not making the $170 mistake I made. I got what a paid for and have now ordered an original filter from Austin Air.

Replaced the original filter with this. perfect fit, easy to do.

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!!

Replaced my Austin filters with the filter monster, can’t even tell if it’s on, so much more quieter and fit perfectly!Highly recommend this filter, much cheaper than on the Austin site.

This filter didn't fit exactly the same as the original HM400 filter but it works perfectly and actually makes less noise. Also much more economical than the Healthmate HM400 filters. Great product!

Better than the one that came with the air purifier 👍

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