Several of my clients ask me concerning the big square box in the center portion of the house’s upper floor ceiling behind a set of self-closing louvers. It’s a complete house fan and it may either benefit home owners or make living conditions worse.
* Preferably mild climates with cooler and fewer humid nights
* Utilize it only if the temperature and humidity outside is far more favorable in comparison to the conditions indoors. When your air conditioning system continues to be operating in the daytime, as well as the temperature outside drops lower (although the humidity continues to be high), don’t turn the tumblr.com. The vent will suck every one of the humid air to your air conditioned house
* A good time periods to work with it would be, needless to say, early morning and evening
If you suffer from allergies, it is probably not smart to bring each of the pollution in to the house. The window screens will stop a number of it, but whole house fans are really powerful and will make you sneeze more than ever.
1. Before you decide to turn the fan on, open as much windows and doors as you can, close fireplace damper and / or glass door, and shut the furnace / water heater room doors (if they are louver type, it won’t matter). The suction from the whole house fan (at least in the highest speed) is very great, that without open windows / doors, it would draw air externally through any possible openings like, as an example, from the chimney. Should it be a fireplace chimney and you don’t get rid of the ashes… well, it’s gonna be a mess. If it is a hot water heater / furnace chimney, it may possibly blow off of the pilots.
2. When everything is ready, it is possible to turn on the entire house fan in most cases in the next couple of seconds you must feel plenty of exterior air flowing at home. Unless…
3. This part is equally important as opening the doors and windows – both have to be balanced to operate properly to be able to really gain benefit from the whole house fan operation. The atmosphere drawn through the whole house fan needs to be discharged from the attic vents towards the exterior. Otherwise, pressure created from the attic area will result in the air that was just pulled from the house to come back with dust and insulation particles through any possible gaps in the attic wh0le as well as the whole house fan itself.
Regular attic ventilation will not be enough to aid the tumblr post operation; you may want a lot more to transport everything extra volume of air towards the exterior. And the formula to calculate the square footage in the attic vents expected to discharge that air is very simple. You only need the dimensions of your entire rooms:
Example: your ceilings are 8′ high and you have four 10′ x 14′ rooms, one 15′ x 17′ room, as well as a 10′ x 3′ hallway (this is only a sample, calculate all the rooms in your house you believe needs to be covered)
10’x14’x8′ = 1120×4 = 4480
15’x17’x8′ = 2040
10’x3′ = 30
Total – 6550 cubic feet
Now you must to divide 6550 by 750, which equals 8.73 sq feet – this is the portion of the required attic vents (these combined – soffit, ridge, gable, etc.)
4. In case the house you’re stepping into has the whole house fan already installed, lets hope that it was properly sized up because of its purpose (there may be a tag in the unit itself), which would be to replace your home air within just a couple minutes.
5. If you’re normally the one installing the full house fan, consider 3 or 4 minutes as being an optimal time for the house air exchange. To achieve that, you’d have to divide your home total air volume (6550 cubic feet from your sample) by 3 or 4 minutes. That can give us 1810 CFM / 1357.5 CFM (Cubic Feet each and every minute).
6. One more crucial thing: louvers of the tumblr.com/ are not air tight and have no insulation applied to their surface; they leak air between the house and attic. I would strongly suggest installing a huge house fan cover in attic area to prevent air drafts during the cold season – don’t forget to remove it prior to deciding to make use of the fan again.
Whole house fans are noisy and a lot of people never rely on them, however they might benefit your wallet if you apply the above. There are currently other types of house ventilation systems available: they cost more (2 – 3 times) but very quiet, more effective, and supply air flow for long intervals.