Most of my clients ask me about the big square box in the center section of the house’s upper floor ceiling behind a pair of self-closing louvers. It’s an entire house fan also it can either benefit property owners or make living conditions worse.
* Preferably mild climates with cooler and fewer humid nights
* Make use of it as long as the temperature and humidity outside is more favorable than the conditions indoors. If your air cooling system continues to be operating during the day, as well as the temperature outside drops lower (but the humidity remains high), don’t turn the tumble. The vent will suck all of the humid air into the air conditioned house
* A good time periods to work with it would be, of course, early morning and evening
Should you suffer from allergies, it will not be a smart idea to bring all of the pollution in to the house. The window screens will stop a number of it, but whole house fans are incredibly powerful and can make you sneeze more than ever before.
1. Before you turn the fan on, open several doors and windows as possible, close fireplace damper and / or glass door, and shut the furnace / hot water heater room doors (should they be louver type, it won’t matter). The suction from the whole house fan (no less than at the highest speed) is very great, that without open windows / doors, it would draw air from the outside through any possible openings like, by way of example, from your chimney. Should it be a fireplace chimney and also you don’t remove the ashes… well, it’s gonna be a mess. Should it be a water heater / furnace chimney, it may possibly blow away from the pilots.
2. When things are all ready, you can switch on the entire house fan and in most cases throughout the next matter of moments you should feel a good amount of exterior air flowing around the house. Unless…
3. This part is essential as opening the windows and doors – both have to be balanced to operate properly to be able to really take advantage of the whole house fan operation. The environment drawn from the whole house fan has to be discharged with the attic vents on the exterior. Otherwise, pressure created from the attic area can cause air which had been just pulled from the house to return with dust and insulation particles through any possible gaps inside the attic wh0le along with the whole house fan itself.
Regular attic ventilation might not be enough to aid the tumblr operation; you will need a lot more to handle all that extra volume of air on the exterior. Along with the formula to calculate the square footage in the attic vents expected to discharge that air is very simple. You just need the proportions of your rooms:
Example: your ceilings are 8′ high and you will have four 10′ x 14′ rooms, one 15′ x 17′ room, along with a 10′ x 3′ hallway (this is just a sample, calculate all of the rooms within your house you believe should 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 the portion of the required attic vents (all of them combined – soffit, ridge, gable, etc.)
4. In case the house you’re relocating to provides the whole house fan already installed, lets hope that this was properly sized up for its purpose (there might be a tag in the unit itself), which is to replace your house air within only a few minutes.
5. If you’re the main one installing the full house fan, consider 3 or 4 minutes being an optimal time for that house air exchange. To accomplish this, you’d have to divide your property total air volume (6550 cubic feet from my sample) by 3 or 4 minutes. Which will give us 1810 CFM / 1357.5 CFM (Cubic Feet each and every minute).
6. Another essential thing: louvers of the here usually are not air tight and get no insulation put on their surface; they leak air in between the house and attic. I might highly recommend installing a huge house fan cover in attic area in order to avoid air drafts in the cold season – don’t forget to eliminate it before you use the fan again.
Whole house fans are noisy and a lot of people never make use of them, however they might benefit your wallet when you apply the suggestions above. There are actually currently other house ventilation systems available: they can be more expensive (2 – 3 times) but very quiet, more effective, and give air flow for longer periods of time.