Quote Originally Posted by Jkb79 View Post
Well job looks very nice. One small thing though, the variable speed blowers require a min. Of 18 inches of the plenum height to be the same size as the opening on the top of the unit. The reason why is because the blower needs to have the resistance of the pressure of the duct as it try's to find the proper speed. The transition ( while nicely done) will not allow this to happen and you will experience harsh " huffing " noises and uneven airflow. This can cause the loss of capacity and motor damage. Other than that nice job.
Thanks

Good to know

To the OP, nice work by the way