A good product for inline duct venting for my application of venting a basement area which creates a negative space pressure and forces air movement from the upper floor above. The variable speed control lets me determine the needed space air changes required. The low sound level and versatile mounting method are also big advantages too. The air quality in the basement has a noticeable improvement [ as detected in an Air Quality Monitor ] since its installation within two weeks. I would recommend this for new homes which have tight breathing limits of their design and for older homes with a similar issue.