Wall-mounted exhaust fan for open ceilng
Hello! I am a newcomer who is in the midst of construction in White Salmon, WA – lower Washington State, seeking some experienced input related to venting a great room with an 11 ft vaulted open ceiling out the wall at the gable peak. We are installing a radiant heating system and not air conditioning. We do get some pretty hot weather in summer infrequently. We thought that this might help move the air through the house combined with openable low awnings on the one side of the house.
Any suggestions, especially of a good product??
I appreciate any comments. We also felt that as we will be using a downdraft in our island, that if we have a real problem of burned food, we could turn this fan on and vent it pretty quickly.
Thank you in advance for your time and input, looking forward to hearing your comments.
Replies
Check out this. Motorized door seals tight.
http://www.energyfederation.org/consumer/default.php/cPath/30_426_102
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Thank you csnow, I appreciate yoru quick response - I am checking it out.
If you have naturally vented combustion appliances in your home, be careful of backdrafting that may be caused when the downdraft is used. It's been a problem due to more snug efficient construction and that some of these fans are monsters (600 cfm and larger) that have caused backdrafting in older looser homes.
Experienced -
What is an example of naturally venting combustion appliances - a direct vent gas stove or gas cooktop? or wall oven?
This is new construction attached to a remodel.
the fan that csnow recommended is a 100 cfm fan. I will have to find out which amount of cfm is suitable for a 670sq ft space - kitchen, front entrance, dining room and living room all open to each other. Anybody know the calculation that I need to make?
Any oil, gas or wood fueled appliance that that vents into a standard chimney is usually naturally drafted.
I've not heard of any downdraft kitchen range exhausts as low as 100 cfm- most lines usually start in the 350-500 cfm areas.
It is recommended by the Home Ventilating Institute that a kitchen exhaust system be able to give 15 air changes per hour (ach). So:
670 sq ft (my, a large kitchen) x 8' high x 15 ach = 80400 cu ft / hour divided by 60 min/hour = 1340 cfm (my, a very, very large fan!!!)
Sorry, hit the post button before I was really finished....too late at night here -2:30 AM.
Find the area that will actually be "kitchen" and plug it in to my example.
Thank you, Experienced.
My kitchen is 160sqft of that space. This would require a 360cfm fan. Anyone recommend a great downdraft fan product?
The wall exhaust fan is more for getting hot air out when AC would be desired but also help the kitchen when there is a big odor event. The downdraft would probably meet the 15ach per minute recommended by the Home Ventilation Institute (whose website I will have to check out). Do you know how I would size the wall exhaust for the room given its purpose? Or might it be the same. We might consider using 2 smaller ones on either side of the ridge beam in the same gable end instead of one big fan.