Master bedroom /shower and toilet room / and 2 big closets , and a tub room all share one air return – the door from master bedroom into the hall. And thereby into the HVAc return. 5 floor supply ducts.
I need more return —If I close the bedroom door it cuts off the return. do over the door transomes still exist ot throught the wall 6 or 8 inch ducts?any with sound dampers?
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https://www.lowes.com/pd/QuietCool-Accessories-6-in-x-14-in-White-Galvanized-Steel-Whole-House-Fan-Shutter/1001035292?cm_mmc=shp-_-c-_-prd-_-bdm-_-google-_-pla-_-103-_-sosventilators-_-1001035292-_-0&placeholder=null&ds_rl=1286981&gclid=CjwKCAiAxeX_BRASEiwAc1QdkfCuq32COL3enE5-9SB9GVc1oeAHMwOWW19YD6G_uIhIqWyjdDmm9xoCBxwQAvD_BwE&gclsrc=aw.ds
and a few others on the market.
I have thought about these, but have not added one.