| 摘要 |
The present invention relates to a sleeve for an air duct and a method to construct an air duct using the same. The sleeve for an air duct includes: a sleeve which comprises a hollow type main body part which has an upper part and a lower part formed to be penetrated to allow a vertical exhaust pipe to be inserted, a fixing flange part which is located on the same line as a casting plane of a concrete by being curved to the outside of an upper part and a lower part of the main body part, a fixing protrusion which is formed to protrude inwardly along the inner circumference of the main body part, and fixes the position of the vertical exhaust pipe by coming in contact with the front end of the vertical exhaust pipe, and a rigid reinforced protrusion which is formed to be spaced from a lower part of the fixing protrusion, protrudes toward the outer circumference of the main body part, and improves a contact area with the sleeve and the concrete; and a sealing cover which comprises a fastening flange separably fastened to the fixing flange part by a fastening unit and an insertion part inserted into the inner circumference of the main body part, and prevents inflow of a byproduct of the concrete while the concrete is poured. |
