Nate R
Member
Looking at doing something as an alternative to air conditioning whenever possible. My house does not have central air, so we use window units when necessary.
The downstairs of the house isn't too bad in Summer. Tolerable enough for the most part. (LR and Kitchen)
I'm more concerned about keeping the 2 bedrooms upstairs more comfortable for less money.
I looked at whole house fans, but they require a larger opening than I would like as we have no place large enough to hide the grille out of sight. My wife does not want it in plain sight. They also seem to be somewhat loud.
I'm only looking at 1800 cubic feet of space that I'm looking to move air through. (The 2 bedrooms)
What I've come up with is using the Broan L900L in the attic, w/ 2 inlets. One in each closet in each bedroom. (Closets have no doors and are open to the room)
900 CFM and only 3 sones! Some of the small inline units I was looking at were more expensive and were 14 sones to move 1000 CFM. 14 Sones 8 feet above where I sleep may be an issue.
The inlet/outlet duct size on this unit is 12X8. The instructions seem to indicate they intend you to use 12" diameter ducts intake and exhaust or 12X8 ducting. Not a problem for the most part. I'm assuming they need to be this big to keep the noise down. They sell wall outlets for 12" duct that are just giant dryer vent type outlets.
I only wonder on how to size the intakes before they come together since I'd have 2.
12X8 is 96 square inches. If I have 2 inlets feeding this duct, how do I determine what size they should be? 1/2 the area would be 48 inches. An 8 inch round duct would be ~50 square inches. If I use two 8" ceiling inlets, will that be enough? Or do I need something more? Or is this more than enough?
I'm open to other less expensive ideas as well!
The downstairs of the house isn't too bad in Summer. Tolerable enough for the most part. (LR and Kitchen)
I'm more concerned about keeping the 2 bedrooms upstairs more comfortable for less money.
I looked at whole house fans, but they require a larger opening than I would like as we have no place large enough to hide the grille out of sight. My wife does not want it in plain sight. They also seem to be somewhat loud.
I'm only looking at 1800 cubic feet of space that I'm looking to move air through. (The 2 bedrooms)
What I've come up with is using the Broan L900L in the attic, w/ 2 inlets. One in each closet in each bedroom. (Closets have no doors and are open to the room)
900 CFM and only 3 sones! Some of the small inline units I was looking at were more expensive and were 14 sones to move 1000 CFM. 14 Sones 8 feet above where I sleep may be an issue.
The inlet/outlet duct size on this unit is 12X8. The instructions seem to indicate they intend you to use 12" diameter ducts intake and exhaust or 12X8 ducting. Not a problem for the most part. I'm assuming they need to be this big to keep the noise down. They sell wall outlets for 12" duct that are just giant dryer vent type outlets.
I only wonder on how to size the intakes before they come together since I'd have 2.
12X8 is 96 square inches. If I have 2 inlets feeding this duct, how do I determine what size they should be? 1/2 the area would be 48 inches. An 8 inch round duct would be ~50 square inches. If I use two 8" ceiling inlets, will that be enough? Or do I need something more? Or is this more than enough?
I'm open to other less expensive ideas as well!