Pressure WRT Main Body

When doing pressure balancing across rooms, what is the maximum pa from a room WRT the main body (room with the return in it)? This is assuming a supply grill in the room and a single return in the main body.
Thanks Andy
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.