Get the straight facts along with lovely, smooth hair! Without the proper ventilation cosmetologists may be over exposed to excessive levels of formaldehyde or glutaraldehyde, so they should invest in an efficient ventilation system. A "Chemical Source Capture System" removes these potentially harmful vapors from the breathing zone of both the stylist and client. Search "Chemical Source Capture System", "Hair Smoothing Controversy" or "Preferred BKT Ventilation" for additional information.