size of each jet is preferably 0 015 inches and the jets are each set at an angle of 110 degrees to the horizontal the manifold may be fabricated utilizing available parts such as the spray bar offered in tennant part no 230407 and the nozzles provided on spray bar tennant model no 230407 tennant company of holland mich a carpeted surface requires a specific type of brush one that will gently agitate the fibers and not the abrasive type of force need for smooth surfaced floors a suitable brush for this task would be a cylindrical brush of 4 inches in diameter and 28 inches in length a blended black polypropylene and white nylon gauges black 0 020 white 0 025 of alternating black and white rows is suitable for the majority of carpeted surfaces these types of brushes are available from among others flo pac corporation of fontana calif it is important that the carpeting be thoroughly dry before returned to service and the greater the amount of cleaning solution that is removed the faster such drying will occur the vacuum motors designed for smooth surface floors are not sufficient for carpeted surfaces a preferred vacuum motor for carpeting.