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duct plan help

Posted by zach on December 3rd, 2002 08:02 PM
In reply to New HVAC forum; click on open forum by James Darrel on August 31st, 2002 11:31 AM [Go to top of thread]

I am going to be installing my central heat and air starting in 2 weeks and would like some input on my duct plan? The unit will be a 12 seer 3.5 ton gas/ electric trane roof mounted. My house has 7 rooms plus a kitchen and one bath.

room Sq ft.
1. 132 sq ft.
2. 168 sq ft.
3. 150 sq ft.
4. 132 sq ft. ----all to have 8" ducts with 8X16 registers.
5. 218 sq ft. /
6. 132 sq ft. /
7. 379 sq ft./--two 8" ducts to two 8X16 registers.
bathroom 40 sq ft.--6" duct 4X6 register.
kitchen 120 sq ft.--8" duct 8X12 register.

I will have 5 trunk lines coming off of the drop plenum.

1. 8" going to room 1
2. 12" to a 12-8-8 wye to rooms 2 and 3.
3. 10" to a 10-6-8 wye to bathroom and room 4.
4. 12" to a 12-8-8 wye to rooms 5 and 6.
5. 12" to a 12-10-8 (8is to the kitchen) wye to a
10-8-8 wye to room 7.
All rooms will have an inline damper to adjust flow.

How big a return? I thought about 2 14"X30" side by side so I wouldn't need to cut the ceiling joists, but I would rather cut the joists and put in one big one, so How big, it will be in a hallway 36" wide max.

Hope this is enought info, and thanks for your input.


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