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Anonymous users2024-01-24The national standard is a mandatory standard.
In other words, the national standard is the minimum standard.
It can't be lower than this, the landmark is based on the national standard and then the depth is specified, generally speaking, the landmark is higher than the national standard.
Therefore, there is no contradiction, higher than the national standard according to the landmark, lower than the national standard according to the national standard.
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Anonymous users2024-01-23By local standards.
GB T is recommended by the state.
If you don't have the conditions in the place, you can not press it.
GB T16729 has been abolished, the current is GB-T 8484-2008 building exterior doors and windows insulation performance classification and testing methods, if you want to give an email.
This standard was issued on July 30, 2008 and implemented on March 1, 2009. >>>More
Water sealing: The airtightness of doors and windows refers to the amount of air permeability per unit opening joint length or unit area of doors and windows. It tests the ability of doors and windows to prevent air penetration when closed. >>>More
According to the use function, importance, geographical location of the building, etc., the exterior doors and windows of the building are selected to be airtight, watertight, and wind-resistant.
Find the relevant form, how to ask how to inspect, but the "three sexes" test of aluminum alloy and plastic steel doors and windows should be sent to the authority for testing.