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Round Gravity Ventilator
Technical Data and Specifications |
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When ordering, please specify roof slope and base type. |
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 Type 1 (left) and Type 2 (right) Base Types |
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 Type 3 (left) and Type 4 (right) Base Types |
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TABLE OF CAPACITIES FOR ROUND VENTILATORS
TO ESTIMATE VENTILATOR CAPACITY: Determine the height of vent above the air intakes and the "Temperature Difference" between inlet air temperature and outlet air temperature. With these two constants find the "Factor" from Table "A." Multiply base rate C.F.M. from "Table C" by the factor from "Table A." The result is approximate vent capacity at "0" M.P.H. outside wind velocity. Beside the factor in Table A is the letter A, B, C or D. This letter refers to a factor in Table "B." Multiply vent capacity for "0" M.P.H. wind by appropriate factor from Table "B" for vent capacity under the given wind condition. |
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EXAMPLE:Use Ventilator Size 20" Ventilator Height Above Intake 20' Factor From Table "A" is .76A at 15° Temperature Difference Multiply: .76 x 712 = 541 CFM at "0" M.P.H. Using 3 M.P.H. Wind Vent Capacity is 541 x 1.14 = 617 C.F.M. |
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