Many of my clients ask me in regards to the big square box within the center part of the house’s upper floor ceiling behind a set of self-closing louvers. It’s a huge house fan also it can either benefit house owners or make living conditions worse.
* Preferably mild climates with cooler and fewer humid nights
* Use it if only the temperature and humidity outside is a lot more favorable in comparison to the conditions indoors. In case your air-con system has been operating throughout the day, and also the temperature outside drops lower (although the humidity continues to be high), don’t turn the find more. The vent will suck every one of the humid air in your air conditioned house
* The best time periods to utilize it might be, needless to say, early morning and evening
If you suffer from allergies, it might not be a good idea to bring all the pollution in to the house. The window screens will stop a few of it, but whole house fans are very powerful and will make you sneeze more than ever.
1. Prior to deciding to turn the fan on, open as many doors and windows as you can, close fireplace damper and / or glass door, and shut the furnace / hot water heater room doors (when they are louver type, it won’t matter). The suction in the whole house fan (a minimum of on the highest speed) is very great, that without open windows / doors, it is going to draw air from the outside through any possible openings like, for instance, from the chimney. Should it be a fireplace chimney so you don’t remove the ashes… well, it’s gonna be a mess. If it is a hot water heater / furnace chimney, it may possibly blow from the pilots.
2. When things are all ready, you may start up the entire house fan in most cases within the next couple of seconds you should feel lots of exterior air flowing in your home. Unless…
3. This part is equally important as opening the doors and windows – both must be balanced to function properly as a way to really benefit from the whole house fan operation. Air drawn from the whole house fan should be discharged through the attic vents for the exterior. Otherwise, pressure created within the attic area may cause the environment that was just pulled away from your house to come back with dust and insulation particles through any possible gaps within the attic wh0le as well as the whole house fan itself.
Regular attic ventilation is probably not enough to support the More hints operation; you may want far more to handle everything that extra level of air to the exterior. And the formula to calculate the sq footage in the attic vents required to discharge that air is very simple. You only need the proportions of all of your rooms:
Example: your ceilings are 8′ high and you will have four 10′ x 14′ rooms, one 15′ x 17′ room, plus a 10′ x 3′ hallway (this is merely a sample, calculate all of the rooms in your own home you think must be covered)
10’x14’x8′ = 1120×4 = 4480
15’x17’x8′ = 2040
10’x3′ = 30
Total – 6550 cubic feet
Now you have to divide 6550 by 750, which equals 8.73 sq feet – this is actually the part of the required attic vents (all of them combined – soffit, ridge, gable, etc.)
4. In case the house you’re getting into provides the whole house fan already installed, lets hope it was properly sized up for its purpose (there could be a tag in the unit itself), which would be to replace your property air within just a couple minutes.
5. If you’re the main one installing the complete house fan, consider 3 or 4 minutes being an optimal time for your house air exchange. To achieve that, you’d must divide your home total air volume (6550 cubic feet from our sample) by 3 or 4 minutes. That will provide us with 1810 CFM / 1357.5 CFM (Cubic Feet each and every minute).
6. One more essential thing: louvers of the More Bonuses will not be air tight and also have no insulation applied on their surface; they leak air between your house and attic. I might strongly recommend installing a whole house fan cover in attic area to stop air drafts through the cold season – don’t forget to eliminate it before you decide to utilize the fan again.
Whole house fans are noisy and several people never rely on them, however they might benefit your wallet when you apply all of the above. There are actually currently other kinds of house ventilation systems available: they cost more (2 – 3 times) but very quiet, better, and provide air circulation for prolonged amounts of time.