Shenyang Ventilation Engineering The quotation, regardless of material, shall be subject to the length of the center line of the air duct on the construction drawing. It shall be calculated according to the opening area of the air duct with different section shapes (circle, square, rectangular), and measured in square meters.

purify Ventilation duct And component manufacturing and devices. The calculation method of quantities is the same as that of general ventilation ducts, and the corresponding quota is used. However, the purification cost of components and devices shall be calculated, and 35% of the base price of the devices of the corresponding component sub item shall be taken as the purification cost, of which the labor cost shall account for 40%. The cost of the essence sealing treatment between the purification pipeline and the building gap shall be calculated according to the actual situation.

The open area of circular air duct does not deduct the area occupied by the inspection hole, measurement hole, air supply outlet, air suction outlet, etc., and the area occupied by the seaming stack, and the seaming stack part is not added.

The bluing pad in the air duct manufacturing device quota is summarized and considered according to various data types, and shall not be converted.

For the design of the whole ventilation system, tapered pipes are used for uniform air supply. Circular pipes are of uniform diameter according to the section, and rectangular pipes are of uniform perimeter according to the section. The corresponding rule sub items are applied, and their labor is multiplied by a factor of 2.5. For the air curtain air supply duct manufacturing device, the corresponding air duct rule sub item shall be applied according to the uniform perimeter of the rectangular air duct section, and the artificial cost coefficient shall be 3.0, which is expected to remain unchanged.

The type, standard, function and thickness of air duct manufacturing data shall comply with the design drawings and the current national product standards.

Manufacturing quality requirements:

The standard and size of air duct shall meet the design requirements;

The appearance quality of the air duct shall be flat and straight with even arc, parallel at both ends and no warping angle;

The inner and outer surface of the air duct shall be smooth. It is strictly prohibited to have horizontal seams, set reinforcement bars in the duct or use the rib reinforcement method. The longitudinal seam at the bottom shall be minimized. When the bottom edge of rectangular air duct is less than 800mm, there shall be no longitudinal seam at the bottom edge. All nuts, bolts, washers and rivets shall be matched with the pipe function, and materials that will not produce electrochemical corrosion shall be selected, or galvanized materials shall be selected; The seaming seams of clean air ducts are closely connected, uniform in width, and free from holes, half seaming and cracks.

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