In this study, the experiment was conducted on a fire door(W × H = 0.98 m × 2.19 m) installed on the vestibule. The effective leakage area for each opening angles and closing forces derived from the impulse-momentum equation was compared and analyzed with the experimental results. As a result of the experiment, the major factors affecting the door closing forces were the pressure difference and the area of the door. The difference of door closing forces between measured and calculated values by the impulse-momentum equation showed a deviation of less than ±15% at the opening angles of 5°to 10°. At the door opening angle of 2.5°, the dynamic pressure was much higher than the measured static pressure, and this pressure difference is estimated to be air resistance acting to prevent the door from being completely closed.

Abstract
1. 서 론
2. 연구방법
    2.1 이론적 배경
    2.2 실험방법 및 결과
3. 분석 및 고찰
    3.1 개방각도별 차압과 풍량의 관계
    3.2 폐쇄력 시험결과 분석
    3.3 개방 각도에 따른 문의 폐쇄력
4. 결 론
5. References

• 오원신(세종사이버대학교 소방방재학과) | Won-Sin Oh (Department of Fire and Disaster Prevention, Sejong Cyber University)
• 정석환(세종사이버대학교 소방방재학과) | Suck-Hwan Joung (Department of Fire and Disaster Prevention, Sejong Cyber University) Corresponding Author