carbon dioxide (CO2) based damper and direct digital control (DDC) module installed on packaged rooftop heating, ventilating, air conditioning, and refrigeration (HVAC/R) units, the damper module capable of drawing and regulating outside air into the HVAC/R units and then into inside spaces of high occupancy non-residential buildings associated with the HVAC/R units to control indoor air condition levels therein

'air':18,33,58 'associ':50 'base':4 'build':49 'capabl':27 'carbon':1 'co2':3 'condit':19,59 'control':9,56 'damper':5,25 'ddc':10 'digit':8 'dioxid':2 'direct':7 'draw':29 'heat':16 'high':44 'hvac/r':22,36,53 'indoor':57 'insid':41 'instal':12 'level':60 'modul':11,26 'non':47 'non-residenti':46 'occup':45 'outsid':32 'packag':14 'refriger':21 'regul':31 'residenti':48 'rooftop':15 'space':42 'therein':61 'unit':23,37,54 'ventil':17

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