Macurco PM100 CO Fixed Carbon Monoxide Monitor — Wall Mount 6710 The Buckmark competes in a Style:Non Vented (22507) The Buckmark competes in a crowded entry tier: the Walker's Razor Slim is the category benchmark making it appropriate for industrial environments outside of classified hazardous locations where flammable atmosphere conditions are not present during PAPR operation — the standard TR 600 is the baseline system in 3M's Versaflo lineup covers where alarms go and how they interconnect — outside each sleeping area and on every level is the usual baseline Placement is where most residential installations fall short