NGP 320 Automatic Door Bottom - Mortise

National Guard Products' 320 automatic door bottom is designed for hollow metal doors, has a neoprene, silicone or vinyl insert, and a max drop of 1/2". May be cut up to 4" to adjust for door width. Fits in 1-5/8" x 3/4" channel. A "furring strip” (not included) may be used to lower automatic door bottom when a deeper channel is used. Silicone is resistant to ozone, UV, aging, moisture and flame and recommended for areas using FM200 or Halon Fire Suppression Systems. Vinyl is moisture and flame resistant, oxidative degradation from age and exposure to cold, heat and UV causes hardening, loss of memory and resilience, cracking, crazing and discoloration. Complies with IBC, NFPA 80 and NFPA 252 for application to hollow metal fire doors rated up to 3 hrs., and wood fire doors rated up to 90 minutes.