Throat Calculator for Cylindrical Tanks
Use this calculator to lay out the throat opening on a cylindrical tank in combination with a square shaped firebox.
Trapezoid Shaped Throat Opening for Cylindrical Tanks
Use this calculator to lay out a trapezoidal shaped throat cut-out in combination with a square shaped firebox.
Enter the width of your firebox
Enter the height you want for a grease dam at the bottom of the tank.
Throat Calculator for Overlapping Cylindrical Tanks
Use this calculator to determine the throat cut-out when using two cylindrical tanks of the same or different diameter. The cut-out width will always be the same for both tanks. Enter the tank's diameter and the throat area from the Pit Calculator.
Overall Height of cut-out