sealed combustion air intake system to boiler heaters consisting of a pressurized vent pipe, air-intake elbow termination pipe and an in-line air filter to prevent air-borne particles from entering the burner fuel-air mixture

'air':3,16,26,31,40 'air-born':30 'air-intak':15 'boiler':7 'born':32 'burner':37 'combust':2 'consist':9 'elbow':18 'enter':35 'filter':27 'fuel':39 'fuel-air':38 'heater':8 'in-lin':23 'intak':4,17 'line':25 'mixtur':41 'particl':33 'pipe':14,20 'pressur':12 'prevent':29 'seal':1 'system':5 'termin':19 'vent':13

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