Air Ventilation apparatus and instruments comprised of air flow straighteners in the nature of dampers, namely, control devices used in air ducts to regulate the flow of air, weather hoods in the nature of HVAC air extractor hoods and fabric air dispersion ducts for distributing and dispensing air as part of a HVAC makeup air system

'air':1,8,21,28,36,41,48,55 'apparatus':3 'compris':6 'control':17 'damper':15 'devic':18 'dispens':47 'dispers':42 'distribut':45 'duct':22,43 'extractor':37 'fabric':40 'flow':9,26 'hood':30,38 'hvac':35,53 'instrument':5 'makeup':54 'name':16 'natur':13,33 'part':50 'regul':24 'straighten':10 'system':56 'use':19 'ventil':2 'weather':29

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