中式油烟机一般都是圆管，你这个得改造一下，安装个转换接口

https://www.lowes.com/pd/broan-3-25-in-x-10-in-x-7-in-galvanized-steel-straight-stack-duct-boot/3373034?cm_mmc=shp-_-c-_-prd-_-app-_-google-_-pla-_-118-_-applianceaccessoryproduct-_-3373034-_-0&kpid&k_clickID=go_1793086277_68999210373_344322586291_pla-383376267086_c_9004053&gclid=EAIaIQobChMI1vv3r-u54wIVFInICh25tgZFEAQYASABEgLQ6PD_BwE