Asian. Soundproofed soft wind must meet the following requirements:
i. Soft soundproofed duct cooling system will be insulated tubes & high quality sound insulation and approved by engineers.
Ii. Soft wind pipe will be inserted does not cause any damage on the effective cross section
b. Soft wind pipe must meet the following requirements:
i. Soft-duct ventilation system will be the engineers are approved.
Ii. Soft wind will be fitted does not cause any damage on the effective cross section
iii. Basic length of duct between 1m to 1.5m soft
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