Ventilation duct works Key points of construction and installation quota calculation

one Ventilation pipe construction And components: power system: supply fan, return fan; Air handling system; Air delivery system: silencer, balance valve; Air distribution system: louver, air outlet, air supply outlet Ventilation engineering Construction: thin steel plate, glass fiber reinforced plastic and composite type.

2. Measurement principle: elbow, tee and reducer are not deducted; Special parts of the deduction valve: elbow guide vane, which does not deduct the quota of the use, manufacture and assembly during measurement; The silencing elbow shall be deducted and installed with silencing elbow.

three Fire damper Silencer, static pressure box and silencer elbow have included the installation of supports and hangers.

4. When the silencer is continuously installed, it is counted as two silencers.

5. The developed area of the static pressure box is calculated as 6 sides, without deduction of openings.

6. When the rectangular air duct concentric bend has a large side length (horizontal side length)>500mm, guide vanes must be set.

7. Setting position of inspection hole: when the air duct is long, one at the head and one at the tail; If it is an air conditioner, it can be omitted; The constant temperature and humidity air conditioner needs to be set; Inspection holes shall be set for high and medium efficiency filters.

8. Measuring hole: set at the inlet and outlet of main pipe and branch pipe

9. System tightness: the area of air duct to be tested as required is calculated in m2. Light leak detection

10. Off site transportation: calculated in m2, only refers to the developed area of sheet steel air duct, plenum, cover and flashing. make

11. The flexible hose is calculated by section regardless of whether it is insulated or not.

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