Agree with these reviews, excellent product for those with asthma. I have 2 dogs, and these filters do the job in controlling the hair and dander.

This is our second one and I love how it works and all the things it filters out of the air. Also we have 3 big dogs, lots of hair and dander.

I have used these for years. Having pets and allergies, these filters keep dust and dander to a minimum.

This item measures 4-3/8", not 4" and will not fit into my furnace. I am very disappointed because I trust this to be a great filter.

Noticeably less dusting needed when using this filter. Also keeps our furnace very clean - said our HVAC serviceman.

We have been having a dust problem, living in an older home. This filter has helped reduce the dust significantly.

Since using this product, the air in my home seems to be so much cleaner. Thanks for a great product.

Use these exclusively; feel they really help lessen breathing problems caused by having two cats and a dog in the house.

I breathe easier knowing that all the dirt and other microscopic things caught in the filter are not floating around in the air I'm breathing.

what else is there to say? the filter removed allergins from the air. you don't need my lifes story!