# How to Measure an Insect Screen?
Source: https://www.fenetresystems.com/en/how-to-measure-an-insect-screen/

# How to Measure an Insect Screen?

Measuring windows and doors for a correct insect screen order. Steps that prevent errors by clear opening, tolerance and fitting type.

[Guide](https://www.fenetresystems.com/en/guide/) October 11, 2026

The most critical step in ordering an insect screen is taking the correct measurement. A wrong measurement means the product either will not fit or will leave a gap. This guide explains the correct measuring method for windows and doors step by step.

## All You Need: A Tape Measure

No professional equipment is needed for measuring. A standard tape measure is enough. Measurements are noted in centimetres (cm) .

## Measuring for a Window

- Width: The width of the inner opening where the window sash sits is measured. It is measured at three points — top, middle and bottom — and the smallest value is used.

- Height: The height of the same opening is measured on the left, centre and right. Again the smallest value is used.

- Depth check: Clip-mounted fitting requires sufficient flat surface on the inner face of the joinery. On narrow joinery, [screw fitting](https://www.fenetresystems.com/en/insect-screen-installation-types/) is preferred.

## Measuring for a Door

On doors, the clear passage opening is measured:

- The inside-to-inside width of the door frame

- The clear height from the top frame to the floor (threshold included)

On [pleated](https://www.fenetresystems.com/en/pleated-insect-screens/) and [sliding](https://www.fenetresystems.com/en/sliding-insect-screen/) models, the bottom rail height is also noted.

## Common Mistakes

- Taking the outside measurement: The insect screen is produced to the inner opening. The outer frame measurement is not used.

- Measuring a single point: Joinery is not always perfectly square. Measure at three points and use the smallest value.

- Calculating tolerance: The fitting allowance is not deducted from the measurement. The clear opening measurement is passed on. Production applies the tolerance.

## When in Doubt

Once a photo of the joinery is sent over the WhatsApp channel, the correct measuring points are marked on the image. An on-site survey service is also available across Gebze, Kocaeli and Istanbul.

Correct measurement = trouble-free fitting. Two minutes of care prevents days of waiting.

## Questions About This Topic?

Detailed information on the product or application covered is obtained directly from the manufacturer.

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