Installed into a 17ft millard horizon im renovating, put in to replace a 22yo four seasons hatch, made a pine frame to reduce thw hole size to 400 and it dropped straight in. Very light, i can hold it up above my head with 1 arm, lined up perfectly. Its quiet, really quiet, but blows good cold air. It was 30c today and it pulled the van temp down tp 20c in a little over 15 minutes then throttled down.