Hill's valve is a unit, when installed in the duck work in the home, will open or close a valve, on demand,and will stop or allow the flow of cool or heated air to pass through. The purpose of this unit is to stop the flow of air back up through the open duck's after the air condition has shut off

'air':35,50,60 'allow':28 'back':51 'close':19 'condit':61 'cool':32 'demand':23 'duck':11,56 'flow':30,48 'heat':34 'hill':1 'home':15 'instal':8 'open':17,55 'pass':37 'purpos':40 'shut':63 'stop':26,46 'unit':6,43 'valv':3,21 'work':12

HILLS VALVE

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