공기 직사각형 및 둥근 덕트 계산 속도 압력이 피팅 압력 방울을 떨어 뜨립니다.
Simple way of
Duct Calculator and It is possible change each dimension each units. New fittings calculations with base SMACNA coeficients. Program with new interfaces will work more properly on different phones.
9Apps 4.9
![국세청 홈택스 [손택스] on 9Apps](https://sg-res.9appsdownloading.com/sg/res/jpg/f7/df/69cc2f90120ec331db2630e0f5b6-6dh.jpg?x-oss-process=style/jmq200)
