#1 Good “Soffit” Ventilation
Make sure you have good soffit ventilation around the eaves of your roof. You will want approximately 4 sq./ft. of free intake (fresh air) per fan. If you have a grill or holes covering 50% of that intake, then you want to consider 8 sq./ft. per fan. This is also important because you don’t want your solar attic fans to draw air conditioned air through your can lights in your house. You want the fresh cooler air coming in from outside. [/stag_one_half_last] [/stag_columns] [stag_columns][stag_one_half]
#2 Where Do I Place the Fan on my Roof?
You want to put your Remington Solar attic fan ideally on a south or west facing slope. If you don’t want your fan visible from the front, and your front happens to be facing ideal directions, then use our 25W or 30W tiltable fans. You would mount those on the back of your house (facing any desired direction), then use the tilt panel feature to tilt back towards the south or west (or “flat to the earth”). This will maximize the power to your motor.
Try to put your fans on a central or “middle” portion of your roof. Keep in mind that you want to draw cooler outside air from a soffit (or gable) and flow that through your attic. While it’s ok to over-power your attic ventilation by using 2 or more fans, simply make sure that you have that good intake.
Also, as mentioned earlier, keep them about 5 feet away from ridge vents (or other open vents). Like anything, some roofers who are not familiar with solar attic fans may tell you that you cannot use solar attic fans and ridge vents. Our research shows this is simply not true. Also, some insulation companies will tell you that you need to completely seal your attic. Solar attic fan technology has been around for many years, and research shows that a cooler attic means 1. cooler downstairs temperatures 2. longer roof life 3. insulation will not degrade as rapidly 4. cold water pipes in the attic will stay colder 5. less of a burden on your HVAC system 6. more comfortable occupants and 7. lower utility bills.
#3 Attic Size
Almost there. Now use this guide to approximate your attic size:
If your roof is 2:12 to 5:12, then simply use the square footage of the footprint of your house. For example, if your house is a one-story 2000 sq. ft. house with a 5:12 pitch, then use 2,000 as the square footage of your house for solar attic fan sizing. If your house is a 2-story 4,000 square foot house, then divide by 2 to get 2,000 as your number.
If your roof is 6:12 or steeper (up to 12:12), then you should add 10% to your square footage calculation. For example, if your house is a one-story 2300 square foot house, then add roughly 230 feet to your attic space calculation to get 2,530 feet. Therefore if your house is 4,500 2-story, then divide by 2 to get 2,250, then add another 10% (225) to get 2,475. This way you’ll compensate for a steeper, larger roof space. Just remember to have approximately 4 square feet of free soffit ventilation (intake of fresh air) per fan. While we don’t want to be accused of trying to sell more fans than you need, it is ok to use 2 or more fans to increase ventilation properties. Many customers right on the edge of ventilation specification requirements will go ahead and purchase an additional fan. We’ve never heard that a homeowner regretted this decision.
|Attic Size||Attic Fan Needed|
|800sf||(1) 20 watt fan||Fan Details|
|1,200sf||(1) 20 watt fan||Fan Details|
|1,600sf||(1) 25 watt fan||Fan Details|
|2,000sf||(1) 30 watt fan||Fan Details|
|2,400sf||(1) 30 watt + (1) 20 watt||Fan Details|
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