(4) The influence on floor height An insulation layer needs to be wrapped outside the galvanized iron air duct on site, and the insulation layer often requires replacement when carrying out maintenance, so in addition to the height of the duct itself, a certain space for installation and maintenance should be reserved. The fabric air duct itself has the thermal insulation effect, so it can be installed close to the roof without reserving the space for installation. The measured results show that the use of fabric air duct can save about 5 -10cm in height compared with the use of galvanized iron air duct. (5) The service life It is easy for galvanized iron sheet to rust in a humid environment, and the glass fiber, another kind of insulation material commonly used in galvanized iron air duct, will become brittle after moisture absorption, therefore, the service life of galvanized iron air duct is about 5 to 10 years. While the textile air duct has a service life of up to 20 years. ...
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