Quote Originally Posted by beenthere View Post

The system the OP is working on, could have a fire damper or 2 closed or partially closed. A Rawal valve would cover this up. And the customer would end up with a system that doesn't cool the area like it should.
Yrs ago I had a big carrier lose it insulation from one of the supply trunks and I found it caught in some turning vanes blocking air flow. That unit was freezing up also.