When choosing a tent, the testing methods for its breathability mainly include instrument measurement, sensory evaluation, and reference standards and data. The following is a detailed explanation:
Instrument measurement method
Air permeability tester: This is an instrument specifically designed for measuring the air permeability of materials. It can simulate the flow of gas under certain conditions and evaluate the air permeability of materials by measuring the amount of gas passing through the material within a unit of time. When operating specifically, fix the tent fabric on the tester, set the test conditions (such as temperature, humidity, pressure, etc.) according to the instrument operation guide, and then start the tester for measurement. After the measurement is completed, the instrument will display the air permeability data of the tent fabric.
Thermal imager: In some high-level tests, a thermal imager can be used to observe the temperature difference and air flow inside and outside the tent, thereby indirectly evaluating the tent’s air permeability.
Sensory assessment method
Direct observation: On a sunny day, set up the tent and close all the doors and Windows. Observe for a period of time (such as several hours or longer) to see if there is any obvious dampness or water droplet condensation inside the tent. If the interior of the tent remains dry, it indicates that its air permeability is good.
Human body sensation: Enter the interior of the tent and feel the circulation of air. If you feel that the air is circulating smoothly without any stuffy sensation, it indicates that the tent has good air permeability.
Hygrometer assistance: Place a hygrometer inside the tent to observe and record changes in humidity. If the humidity rises slowly or remains stable, it indicates that the tent’s breathability helps regulate the internal humidity.
Reference standards and data
International standards: such as the ISO 5912:2020 standard, have clear requirements for the ventilation and air permeability performance of tents. For instance, the tent must ensure at least two ventilation openings, and the area of each opening should be at least 100cmยฒ per person, to promote the circulation of fresh air and reduce the accumulation of carbon dioxide at the lower part of the tent.
Manufacturer information: When purchasing a tent, you can refer to the air permeability data or instructions provided by the manufacturer to understand whether the air permeability of the tent meets the usage requirements.
