Is there anything wrong in having weldneck flanges welded back to back and placed in between 2 butterfly valves? the space in between the flanges ranges in between 3 to 5 inches.
I'm a mechanical designer in the truck/bus industry, and a colleague decided to redesign the front defroster by getting red of the air plenum above the 2 blowers. He said that it's better for performance but I'm wondering why I can't seem to buy it. Any HVAC expert input please.
Thanks.