local exhaust system

This research introduces the local exhaust system (hood) into the consulting room to prevent airborne infection, especially for close-distance conversion. The hood’s capture efficiency is mainly affected by surrounding air flow, so this research compared three various underfloor air distribution systems (UFAD); floor-supply displacements ventilation (FSDV), displacement-flow-type diffuser, and swirling flow type diffuser. FSDV is a displacement ventilation method where SA comes from the whole floor through carpets or panels, forming a tranquil up-flow.

Working with volatile chemicals creates numerous hazards for scientists in laboratory. Therefore, it isrestricted to do such works in a fume hood, which is designed to draw fresh air from the room into thehood and then out into the ventilation system, in order to prevent the accidents happened.According to the laboratory fire incidents investigation, the authors observed that a fire occurred infume hood will be a serious problem which has the potential to get much worse in the future as moreand complex laboratories are used and as the hood usage density increase.