44. Fittings on vacuum lines are to be black or may be galvanized.
45. Where space permits, all tees and elbows must have a radius at center line of not less than 3 in.
46. Horizontal overhead pipes to be supported with substantial pipe hangers spaced not more than 10 ft. apart.
47. The hangers must have an approved form of adjustment and the instructions of the superintendent in regard to securing hangers to floor construction, etc., above must be carefully followed.
48. Where exposed pipes pass through walls or floors of finished rooms they must be fitted with cast-iron nickel-plated plates.
49. Clean-Out Plugs. Brass screw-jointed clean-out plugs are to be provided in lines at all turns where indicated on the drawing. The clean-out plugs to be 2 in. diameter, except in the 1¹⁄₂-in. lines, where clean-outs are to be same diameter as the lines.
50. Exhaust Connection. Exhaust pipe from the exhauster is to be run up to the basement ceiling and along same into the smoke breeching beyond damper as directed.
51. Sweeper Inlets. The following number of inlets are to be provided: Subbasement , basement , first story , second story , attic .
52. The sweeper inlets are to be fitted with hinged covers or caps with rubber gaskets arranged to be self-closing when hose is removed, and those in corridors and lobby arranged to be opened with a key.
53. Inlets coming through finished walls or partitions are to be flush pattern.