#extractionUnmoderated tagAll postsExplore CommunitiesTrending CommunitiesNewcomers' CommunitySteemitCryptoAcademySteemit Feedbackআমার বাংলা ব্লগKorea • 한국 • KR • KOSTEEM CN/中文Steem POD TeamAVLE 일상Tron Fan ClubWORLD OF XPILARBeauty of CreativitySteem Alliance#extractionTrendingHotNewPayoutsMuteddudlaspov (25)in #smoke • 4 days agosmoke extraction fansWe had to design a ventilation system for a large underground garage recently, and safety in case of fire was a top…