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How to measure the size of curved air vents

2026-07-21

Based on your previous consultation on the installation background of industrial fan ports and ventilation accessories, the measurement core of curved air vents is to accurately obtain key parameters. Different types of air vents have different operations, and the specific methods are as follows:

 1 Measurement of core basic parameters

 

Linear distance (chord length): Straighten with a tape measure, measure the linear distance between the two ends of the curved air outlet, and take the average of two additional measurements.

 

Arc length: Fit the tape measure to the edge of the air outlet arc, measure the total length of the arc completely, and avoid data deviation caused by tape offset.

 

Arc height: Find the midpoint of the arc, measure the distance from the top of the arc vertically to the line connecting the two endpoints, and record the arc height at different positions clearly.

 

Total length of the opening: Measure the overall length of the entire arc-shaped air outlet installation opening to ensure installation compatibility.

 

2 Special measurement of different types of air vents

 

Standard arc-shaped air outlet: directly measure the diameter of the circular opening corresponding to the side of the air outlet, and match it with the separately measured arc length of the air outlet, without the need for additional complex parameters.

 

Irregular shaped arc-shaped air outlet: Divide the chord length into multiple segments, measure the vertical height of each segment step by step, and the finer the segment, the higher the accuracy of the final restored arc.

 

3 High precision auxiliary measurement techniques

 

Sample expansion method: If you are concerned about inaccurate data measurement, use cardboard to closely follow the contour of the air outlet and draw a complete shape in a 1:1 ratio. Cut out the sample and hand it over directly to the manufacturer, which can completely avoid dimensional errors.

 

Detail verification: After the measurement is completed, all data is marked on the sketch, and the tape reading and actual photos of the hole are taken. The parameters are synchronized with the processing party to ensure that there are no errors.