What should sealed doors and windows look like?

What exactly should sealed doors and windows look like? This topic is simple to say, but it is really complicated to understand. I try to explain it in plain language as much as possible

Let’s look at the national standard to divide the sealing of doors and windows into several levels, according to the national standard document T 31433-2015, here the sealing is defined as airtightness, which is divided into 8 levels from low to high, of which the lowest is level 1 and the highest is level 8

Before talking about the grading standard, it is necessary to explain that there are two parameters that define the airtightness level. The first is the air penetration amount per unit seat length of doors and windows, which refers to the gap in the openable part of the window, and the air penetration index of each meter and every hour. This mainly depends on the airtightness of the openable area of ​​doors and windows, and is tested. The code in the report is q1, and the second parameter is the air tight performance indicator of the unit area of ​​doors and windows. It refers to the average air permeability index for every square meter and every hour. It contains the fixed area and opening area. The code in the test report is q2

. After understanding these two parameters, it is easier to understand the grading standard of air tightness. That is, under a certain wind pressure, within one hour, the air permeability of windows per square meter does not exceed how many cubic meters, the minimum is 1. The grade standard is that the permeability of each square meter, hourly, and the permeability of more than 10.5 cubic meters is greater than 10.5 cubic meters. This is the worst sealing level. The highest level of air per square meter, hourly, and the air permeability of less than or equal to 1.5 cubic meters. This is the highest level of air tightness of doors and windows. To be honest, I have to write in advance before I can tell it. I hope everyone can understand it. Then the complex things are simplified. My advice to everyone is to talk to the merchant about the secrets of doors and windows. When sealing, you can rationally look at the data, that is, look at the airtightness level of the entire window inspection report. The higher the level, the better the sealing

Finally, I would like to remind everyone to pay attention to the test report data. The data of the inspection report is only valid for this inspection window. In order to avoid merchants reducing their allocation or changing their columns in the later stage, it is recommended to write the product configuration instructions in the report directly to the contract. The sealing may be slightly different when installed when you install it. However, this must be the most binding method.