Tjernlund V2D Underaire Crawlspace Ventilator Fan - 220 CFM Moisture Reducing Fan for Basement & Attic Ventilation | Prevent Mold & Improve Airflow

We had our crawlspace encapsulated last year and they didn't install an exhaust fan. Pretty soon we started to get the "cat pee" smell in the house that a lot of people seem to experience, which is actually ammonia being released from the soil. I didn't want to pay to have them come back and install a fan (which they should have done originally, but I didn't know that at the time), so I bought the Tjernlund V2D to install myself.When I unboxed the fan it looked good and didn't feel cheap. I noticed that the frame was a little warped, but it easily flattened out when I screwed it in place, so this wasn't a big deal. Installation was pretty easy, but will vary depending on your situation. The vent opening I chose was larger than the fan, so I used some scrap plywood to make a frame. I secured the wood frame to the cinderblock with concrete screws and then secured the fan to the wood frame. I had to run a short extension cord to reach an outlet. Not ideal, but the fan has a very low amp draw.We have a dehumidifier in the crawlspace (part of the encapsulation) and I was only concerned with evacuating the ammonia, so I set the fan to always run and it's been running constantly for 8 months and still seems to be running like new. The fan evacuates enough air that we're no longer getting air leakage into the house and we haven't smelled ammonia in the house at all since installing the fan. Yay!!When it's running you can hear it outside within maybe 25 feet. Inside you can faintly hear it if you're standing within a couple feet of it, otherwise you'd probably never notice. Even outside the sound isn't obnoxious though. Basically sounds like two big PC fans, which is basically what I'd imagine they are.We had to stop the ammonia smell from getting into the house, but I didn't want a huge hassle installing a fan and I didn't want cheap junk that had to be replaced after a few months. Overall I'm extremely satisfied with the fan.