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Old 09-04-2010, 09:36 AM   #31
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Changing duct size


Is your home a on slab?

I'd try adding a return else where if possible. Increasing that return's size to 20 X 36 will help a lot with getting more air to all rooms.

And I would definitely put a supply into the laundry room. Probably a 6", since its easier to damper down a supply, then to rerun it later if it doesn't cool it enough.

Do your bedroom doors slam shut at night when you close them and the A/C is on.

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Old 09-04-2010, 10:09 AM   #32
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Changing duct size


yes on a slab can't put a return anywhere else I can increase the current my hall bath and bedroom to the left of the return will shut automaticaly if you close them and stop them a few inches before. The run to the laundry would be like 35 ft so I would rather run 6" and reduce to 4" cause I have leftover supplies. Plus the laundry is only 10x6 off the kitchen and 1 of the vent there blows toward the room already. I just dont want to sink tons of money into this system being that it is from 2003 our electric bills are actually pretty good around 145$ we have gas furnace water heater a dryer. I think our unit actually runs pretty effecient but if I increase the return would it run better?
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Old 09-04-2010, 12:58 PM   #33
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Changing duct size


At 35" just run 6" the whole way. No need to reduce. At that length, it won't flow alot of air.
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Old 09-04-2010, 04:38 PM   #34
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Changing duct size


not 35 inches 35 ft
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Old 09-04-2010, 06:47 PM   #35
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Changing duct size


Quote:
Originally Posted by sjthompson View Post
not 35 inches 35 ft

Ya. I just hit the wqrong key combo. I knew you meant 35 foot.

And for that length, for that room, just use 6" all the way. Don't reduce it at the boot. Install a damper at the take off/start collar, or use a take off or start collar that has a damper.
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Old 09-04-2010, 06:59 PM   #36
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Changing duct size


m idea was to use a 7" off the plenum with a damper and run about 20' into a 7-6-5 y with a damper in 5" part so that I can put the 6" into my living as an extra and the 5" can run to the laundry. But if I put more air in the house I am going to have to figure something out with the return air. Will it hurt to put a small return air above the current return air near the ceiling. I just would hate to put it in and my system go out later and when my new one has to be put in they say that I don't need the flow cause really I would need a 3 ton not 3 1/2
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Old 09-04-2010, 07:06 PM   #37
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Changing duct size


if your going to branch that run. then you better use an 8X6X5 wye.

You can add another return grille above your existing. It will help to return more air. And quiet down your existing return grille.

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