[GOPAPA]

Not sure if you are speaking about zoning. Cutting off more than 10-20% of flow to other areas can cause problems. The existing system is at best designed to accommodate the maximum flow of the system. When you shut passages off it does not necessarily increase flow to other areas. It just decreases efficiency. The system needs to be designed to allow extra flow into all areas to operate properly with zoning. A complete redesign of the system. I cannot even remember how many improperly installed zone systems that were repaired in my career. Make sure you hire someone that knows what they are doing.

Richard,,, in reguards to this what you state

I have our laundry room vent closed for years along with a small bathroom shut down to 1/4 vent and have had no problems so far .. What does this do may I ask have to make repairs to the system .I am not doubting your knowledge just asking for more information .