| 摘要 |
PROBLEM TO BE SOLVED: To provide a band window having more excellent fireproof performance than a conventional one.SOLUTION: A band window 1 includes: a frame body 30 framed by a head jamb 310, a sill 320, and left and right jambs 330, 340; and a mullion 40 sectioning the frame body 30 into a first aperture 10a and a second aperture 20a. Glasses 51 or sashes 200 housed in the aperture 10a and the second aperture 20a respectively are connected to each other by the mullion 40 without providing a stile on the side of the mullion 40. A metallic mullion core material 43 extending in the extended direction of the mullion 40 is provided in a mullion hollow part 41a of the mullion 40. |
