I can't believe no one caught this.
Additionally, the T. Boost isn't externally vented and will not lower the water temp by drawing in cooler external air, as most blowers do.
Ok, so then where does the air come from to feed the blower??? Don't say from under the skirt of the spa, because a blower will suck all the air out from under a spa in less than 2 minutes, and if it isn't replaced by colder atmospheric air the entire cabinet will implode.