I'm tearing apart my kitchen for a remodel and would like to make some changes to the ducting. This is a forced air system with both heat/ac. System was installed a couple years ago and just has flexible 8" duct in the crawlspace (1-kitchen, 1-dining, 2-living rooms). Since I'm going to be tearing up some floors, I'd like to change some of these ducts around (all blowers are on inside walls, cold-air on the outside) and use solid insulated pipes.
Currently the kitchen is 13x25 and only has one duct in the middle inside wall and no cold air return. The room does get colder (lots of air infiltration which will be fixed) but stays relatively comfy in the summer unless you're cooking a lot. I would think two ducts into this room would do the job and add a cold-air return somewhere at least on this end of the house (none currently in kitchen or dining room). The room is about 20' from the furnace/trunk in the basement. Should I run one large pipe from the trunk and then downsize it along the way as I split between the new registers? I could also include the duct in the dining room on this line if possible (that'd be three outlets total). Or should I just run seperate pipes to each? What size duct should I use? Thanks for any help!
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