The following characteristics of coffee have an adverse effect on the upper GI tract: Coffee Decreases Pressure in the Lower Esophageal Sphincter Coffee has been shown to decrease pressure in the lower esophageal sphincter, contributing to gastroesophageal reflux.
Here is how to properly measure and calculate total square footage of the space. 1  Split the room into separate areas. 2  Measure each area of the room separately (area 1, area 2, area 3). 3  Calculate the square footage of the each space by multiplying length by width. 4  Room: Length (ft) x Width (ft) = Square Footage.
To determine the room's volume for the first step in the formula, the room's length, width and height must be multiplied together. When this volume is multiplied by the hourly air changes, the resulting number is the amount of cubic feet of air that passes through that room hourly.