ASTM E1423-21 PDF Download

The ASTM E1423-21 standard provides guidelines for testing the thermal transmittance of fenestration systems. The scope of the standard outlines the specific test specimen sizes and conditions to be used for comparing fenestration products. However, it also allows for the use of different sizes and conditions for product development or research purposes.

The practice focuses on determining the thermal properties of a fenestration system when installed vertically, without considering the influences of solar heat gain and air leakage effects. It mentions that separate test methods should be referred to for assessing the air leakage effects of fenestration systems. Additionally, the standard includes a note regarding the testing of garage doors and rolling doors, which can be found in Appendix X1 of the document.

The main procedure specified in the standard involves determining the standardized thermal transmittance of a fenestration test specimen. This is achieved by using predetermined values for the room-side and weather-side surface heat transfer coefficients, denoted as hh and hc, respectively. These coefficients are used in the calculation and presentation of the thermal transmittance and conductance data, which are measured in accordance with Test Method C1199.