Mann McGowan DD-420S, is a robust threshold seal providing acoustic, cold smoke and environmental sealing when used in conjunction with suitable doors. DD-420S has achieved a 30 minute fire rating when tested to BS 476 pt. 22 1987. Acoustic values of upto 34dB can be achieved depending on door type selected. Features High quality aluminium threshold seal Seals gaps up to 13mm Simple to fit with slide and click mechanism Easy to adjust using slot head screwdriver 30 minute fire rating Excellent noise-reducing performance up to 34dB
