| 摘要 |
An insulating apparatus for mounting within a wall opening and for receiving therein a flue thimble. The apparatus includes a double-walled, cylindrical body member within which the flue thimble is received. The body member defines an annular insulating chamber closed at one end and open at the other to permit air circulation therethrough. A flange extends ouwardly from one end of the body member and is sized to cover the opening of the wall. A cover plate is mounted over the body member and includes a central opening for reception of a vent pipe therein. The cover plate also includes apertures which overlie the open end of the annular chamber to provide air access thereto.
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