air volume control sold as a unit for an air handling system of a commercial, industrial or institutional building, namely, a centrifugal fan, a fan mounting comprising tracks and a wheeled mounting frame adapted to move on said tracks to enable horizontal movement of the centrifugal fan, and an operator capabe of moving the wheeled mounting frame and the fan mounted thereon

'adapt':34 'air':1,10 'build':19 'capab':51 'centrifug':22,46 'commerci':15 'compris':27 'control':3 'enabl':41 'fan':23,25,47,60 'frame':33,57 'handl':11 'horizont':42 'industri':16 'institut':18 'mount':26,32,56,61 'move':36,53 'movement':43 'name':20 'oper':50 'said':38 'sold':4 'system':12 'thereon':62 'track':28,39 'unit':7 'volum':2 'wheel':31,55

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