Take the total amount of square feet in your home.
1300 square foot home attic size.
Of living space measures 40 by 45 at the exterior.
Now let s figure out how much ventilation space we need.
Convert the area to roofing squares.
1 500 square feet.
I have to find the area of the 2 diameter circle which is 3 14 1 squared 3 14 divided by 144 0218055 sq ft.
30 feet x 50 feet 1 500 square feet.
What size furnace do i need for a 3000 square foot home.
For example a 2 200 sq ft.
Obviously issues such as gables dormers styles of roofing ac and electrical installations etc.
Then take 6 5 sq ft.
Take this number of square feet and divide it by 600.
Here is a table with calculated 3 000 sq ft furnace sizes for all 5 regions.
Attic area in square feet.
For example if the base is 12 feet and the height is 10 feet the square footage is 6 x 10 60 feet.
Remember the minimum area requirement when using a continuous system is a ratio of 1 300.
This is for an average american home however and will be undersized for hot arid climates like the southwest.
The answer is the number of roofing squares for the roof.
House divided by 600 3 6666.
So in our example we will divide the 1 500 square feet by 300.
This is useful for estimating the size of a house yard park golf course apartment building lake carpet or really anything that uses an area for measurement.
Ventilation area in square feet.
If your house is well insulated and energy efficient you can estimate down.
Might alter that.
The calculators will also shows acres based on the square feet or dimensions 1300 square feet is an area of roughly 36 06 feet x 36 06 feet.
Example 3 furnace size for a 3 000 square foot home range from 105 000 btu to 180 000 btu depending on the climate zone you re in.
Take the 13 sq ft and divide by 2 which gives you 6 5 sq ft.
1 500 x 30 45 000.
I can only fit 5 2 diameter holes onto the 22 1 2 long blocking.
So for instance a 1 500 square foot home would look something like this.
Divide by 0218055 297 holes required.
3 75 1 0 2 75 so you d need a 2 5 or a 3 ton sized central air conditioning unit.
Because each 100 square feet of roof is one roofing square divide the total area from step 1 by 100.
Make sure to exclude the square footage of your attic basement garage unless you are using any of them as living spaces.
Ok so now we know the square footage of the attic area to be ventilated.
45 000 12 000 3 75.
One might then assume that the floor of the attic might approximate those same measurements.
Assume for a moment that a house at 1800 sq.