CSI Mechanical Home / Products / Indoor Air Quality Components TFD TFM TERV100/TERV200/ TERV300 THUMD500 -FAN POWERED THUMD300 – LARGE BYPASS THUMD200 – SMALL BYPASS EHUMD800 Search for: Contact Us CSI Mechanical 1243-1 E Dixion Blvd Shelby, NC 28150 (704) 600-6267 Email Us: diane@csimechanical.com