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Compatible with a 4" duct - 2 per pack
it features a telescoping inner sleeve
they work in opposite cycles: one unit brings fresh outdoor air into the room while the other exhausts stale indoor air outside
but it also operates at an ultra-quiet 0
reducing the strain on your furnace and lowering heating costs
Vents CO2 Sensors Sale Compatible with a 4" ductBreathe Easy with our Wall Mounted CO2 Sensors available in two Models. The CO2 1 features LED lights that indicate power level (1, 2 or 3) based on Co2 level and on off status. The CO2 2 does not feature an LED lights and is more suitable for premises that require constant ventilation. (schools, libraries, etc). They also have a relay output that can turn your fan on or off based on indoor CO2 levels. These sensors are designed to work seamlessly
