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Air conditioning ventilation when the sound is a big reason

Air conditioning ventilation when the sound is a big reason

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Buried plastic pipe under external load, the diameter of the vertical diameter deformation rate should be less than the allowable diameter of the pipe deformation rate The diameter of the allowable diameter of the pipe shall not be greater than 5% The diameter deformation rate of the pipe and the allowable diameter deformation rate are calculated as follows: ε ΔD / D0 × 100% [ε] ε0 / K where: εΔD pipe in the combined load (Mm) [ε] Permissible diameter Deformation rate ε0 Elastic diameter Deformation rate (%) of pipe, by the flattening of the diameter of the pipe diameter (mm) The test determines the K safety factor, generally desirable 15
According to my specific circumstances, in the following seven major hazards include the division, sub-project focus on control
No matter, it is best to cut the distance between the material and the roof, like an arbor. Otherwise it is not foam board with it

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