09:54AM | 07/29/04
Member Since: 12/19/01
29 lifetime posts
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!


09:14AM | 07/30/04
Member Since: 12/19/01
29 lifetime posts
Heat pro is giving me the following numbers for this room:

Heat: 101

Cool: 517

I also ran it for my dining room and basically the 8" duct that's there is correct. So I'll just be replacing the flexible duct with insulated hard-pipe.

What I'd like to do is add to the trunk with a larger duct and send it into the crawlspace and then branch off to these new/replacement ducts. Basically I'd need to make two 90 turns and go about 2' and connect the 8" duct, then straight out another 8'. At the end I would need to break-off three 6" ducts for the kitchen. These are all based on the cooling requirements with Heatpro. What size duct/trunk would I use for this? My current trunk (10x24 approx) is about 6' long with each duct connected individually for the downstairs. There's also another large duct (18" x 18" approx.) that runs to the 2nd floor attic and branches off for those rooms.

Thanks for any help!
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