10 , 12 , 14 " rough
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A toliet uses 7 to 8 lites per flush!
Although there is no such standard size of a window as the size varies with shape etc. However, 30 x 60 is a common double hung size.
5 gallons at least for a home toliet restrants seem to take 3 gallons that's why they are always are out of order who cares how much the water bill is put your toliet at 5 gallons there is more pressure
In the UK a standard Queen Size bed is also what is classed as a double size at 4ft6inches. King Size beds are 5ft, and single beds are 3ft.
Different manufactures have different standard windows. There is no such as thing as standard windows in US