Quote for Custom Size
Curb Mount Flange
How to Order a Custom Size Curb Mount Flange
  1. Measure the outside diameter of the curb in both directions (A and B)
  2. Measure the inside diameter of the curb in both directions (C and D)
  3. Measure the height of the curb (E)
  4. Determine the fan or vent size to be used according to the inside diameter. If it is an uneven number, choose the next smaller size.
  5. Determine the collar or height of the stack needed
    Collar heights are available in 2, 4, 6, 8, & 12 inches high
Provide dimensions of existing curb mount (refer to diagrams above) Outside length (A)
Outside width (B)
Inside width (C)
Inside length (D)
Height (E)
I am interested in the following vent: Model Inside Diameter
Collar Height (or leave blank and we will call to discuss the best fan/vent for your needs.)
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