LinksLocal WebsitesSMWIA – Local 47 (Sheet Metal Union)UA – Local 71 (Piping Union)ASHRAE, Ottawa Valley ChapterOttawa Construction Association link Provincial WebsitesMechanical Contractors Association of Ontario (MCAO)Ontario Sheet Metal Contractors Association (OSMCA) link National/International WebsitesMechanical Contractors Association of Canada (MCAC)Sheet Metal and Air Conditioning Contractors’ National Association (SMACNA)Mechanical Contractors Association of America (MCAA)
