DIY Home Improvement, Remodeling & Repair Forum > Appliances > HVAC > Whole House Fan - Creative Ventilation Solution or Bad Idea?




Reply
 
Thread Tools Search this Thread Display Modes
Old 06-03-2010, 07:24 PM  
jmd494
Junior Member
registry_dropdown_18759_45353
 
Join Date: Jun 2010
Posts: 2
Default Whole House Fan - Creative Ventilation Solution or Bad Idea?

Background:
I'm new to the forum so hello all...glad to be here. I recently purchased a 6,000 CFM whole house fan for a 1,500 square foot town house.

After doing some research), I realized I a 6,000 CFM fan need 1,152 square inches of Net Free Ventilation Area (NFVA) in the attic (i.e. 1,152 square inches of ventilation). I only have ~650 and, according to my HOA's rules, adding gable/roof vents is not an option.

To the Point:
I have a large spare bedroom that is not in use. It has two large closets and two windows. My plan is to increase my ventilation by installing one 256 square inch register in the ceiling of each of these closets.

Something like this:


When the fan is in use, I will open the windows in the spare bedroom and close the door, thereby transforming its windows into exhaust vents. When the fan is off, I will simply close the registers.

Would this be a good idea? Or should I just cut a big hole in the drywall separating my attic from my neighbor's and double my ventilation? (kidding! )



Last edited by jmd494; 06-04-2010 at 09:52 AM.
jmd494 is offline  
 
Reply With Quote
Old 06-04-2010, 07:42 AM  
Wuzzat?
Banned
registry_dropdown_17632_45359
 
Join Date: Jan 2010
Posts: 2,328
Liked 168 Times on 155 Posts
Likes Given: 94

Default

Watch out it doesn't steal combustion air from your appliances.


Wuzzat? is offline  
 
Reply With Quote
Old 06-04-2010, 08:44 AM  
jmd494
Junior Member
registry_dropdown_18759_45363
 
Join Date: Jun 2010
Posts: 2
Default

Quote:
Originally Posted by Wuzzat? View Post
Watch out it doesn't steal combustion air from your appliances.
Sorry. That went right over my head. Can you elaborate?
jmd494 is offline  
 
Reply With Quote
Old 06-04-2010, 12:24 PM  
TxBuilder
HRT_LIFETIMESUPPORTER.png
 
TxBuilder's Avatar
registry_dropdown_1_45372
 
Join Date: Feb 2005
Posts: 1,677
Liked 5 Times on 5 Posts
Likes Given: 4

Default

He's joking. He's saying it's going to suck all the air through your house. I think. I have no experience with these. Sorry.
TxBuilder is offline  
 
Reply With Quote
Old 06-04-2010, 04:54 PM  
inspectorD
Housebroken
HRT_ADMIN.png
 
inspectorD's Avatar
registry_dropdown_391_45386
 
Join Date: Dec 2005
Location: Litchfield, CT
Posts: 4,243
Liked 180 Times on 151 Posts
Likes Given: 450

Default well

there are a couple different camps on attic fans, or whole house fans, or whatever ya'll call them whereever you live.
The issue you explained is right on, if you do not have the area to remove the air from the attic, it becomes a positive pressure and you can find all kinds of insulation fibers, mold in the insulation and feces....in little pellets comming throw the fixtures.... blowing around your home...not good. Through light fixtures, other bath fans ect...
The other issue you can do is create a backdraft on your oil or gas fired water heaters and boilers that heat water indirectly.
I tell folks to get a roof vent near the fan and install the size you need. They look like spinning turbines. And set the fan on a timer so you do not create a large flue gas backdraft. Set for 20 minutes and open all the windows.

Good luck.
__________________
Just My
Made in the
inspectorD is offline  
 
Reply With Quote
Old 06-04-2010, 07:10 PM  
oldognewtrick
Moderator
HRT_ADMIN.png
 
oldognewtrick's Avatar
registry_dropdown_15773_45395
 
Join Date: Jul 2009
Location: Nashville, TN
Posts: 6,946
Liked 673 Times on 551 Posts
Likes Given: 209

Default

jmd, why don't you just take the vent back and get a smaller size? And please don't cut the dry wall in the attic, cause it's probaly a fire wall.
oldognewtrick is online now  
 
Reply With Quote
Old 06-06-2010, 07:10 PM  
woodchuck
Senior Member
registry_dropdown_7315_45439
 
Join Date: Jul 2008
Location: Tuscaloosa, Al
Posts: 253
Liked 18 Times on 17 Posts

Default

If it's a two speed fan keep it on low. How about eve vents.
woodchuck is offline  
 
Reply With Quote
Old 07-01-2011, 06:03 PM  
Patriot68
Junior Member
registry_dropdown_23023_58443
 
Join Date: Jul 2011
Location: Aurora, CO
Posts: 1
Default

You are way oversized by 4x...I have a 1500SF TH as well and you need a 1500 CFM whole house fan...2000 CFM MAX...go to the Air Scape website and they have a calculate function (not a rep, just an easy function to use). The 6000 CFM WH fan you are trying to use will cause you many headaches that are not even worth going into. If you have a ridge vent and roof vents already you may not even need to add more vents if you right size the WH fan. If you have to add vents another option is to add a solar powered attic fan...yes, whole house fans and attic fans are two different items. If you have a gable vent (HOA does not have to approve as it is internal) you can add an attic vent there and it will increase the discharge and balance the attic space.
Patriot68 is offline  
 
Reply With Quote
Old 07-01-2011, 07:11 PM  
fixitrght
Junior Member
registry_dropdown_23024_58444
 
Join Date: Jul 2011
Location: Cleveland, OH
Posts: 1
Default

I'm interested to hear how you solve the problem, because I don't know anything about installing whole house fans. Matter of fact I only know one person with a whole house fan and it was installed when the house was built. I would think the best solution would be to take it back and try to get one that is the right size for your townhouse. Good luck! Let us know what transpires.


__________________
[url=http://www.1800getroto.com/][B]local plumbing repair[/B][/url] [SIZE="3"][SIZE="4"][B]/[/B][/SIZE][/SIZE] [url=http://www.1800getroto.com/plumbing/gas-leak-detection][B]gas leak detection[/B][/url][SIZE="4"][B] /[/B][/SIZE] [url=http://www.1800getroto.com/plumbing/water-heaters][B]hot water heater replacement[/B][/url]
fixitrght is offline  
 
Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Similar Threads
Thread Thread Starter DIY Home Repair Forum Replies Last Post
Plywood under Drywall? Any idea? istaruga Walls and Ceilings 1 11-16-2009 07:19 PM
Best Unclogging Solution TxBuilder Plumbing Forum 3 08-29-2008 09:10 PM
Home decorating gift idea MikeChris General Home Improvement Discussion 2 12-19-2007 09:19 AM
Probably the dumbest idea I have ever had dakuda Framing and Foundation 18 12-06-2007 08:26 AM
Odd flooring idea - rubber? WestBentley Flooring 3 01-17-2007 12:45 PM

Newest Threads

LATEST SPONSOR DEALS