Product review (3 stars): This is ok, but I've had several issues with ...
This is ok, but I've had several issues with this. First, this would not fit into my 4" diameter vent. I did what another reviewer suggested and cut a slit in the extension to allow this to slide into my pipe. The second  issue, which has more to do with my house than a defect per se, is that my dryer vent is at ground level. It is difficult to get the critter guard on and off because of the lack of clearance. More probelmatic, however, is the fact that this vent hood directs the steam down. So all of that steam condenses on the ground by the vent when it hits the old outdoor air. I am worried that this will create an ice hazard in winter.