Spiralmate Assembly and Installation Instructions kk Bedard
Start duct flange by inserting duct end into flange pocket at the break in the ring.
Seat flange permanently by pressing it so the leading edge of the duct is seated in the pocket of the flange and penetrates the sealant. Hold flange in position with vise grip a few inches from the break.
Begin securing the leg of the flange to the duct section by placing a pop rivet, screw, or spot weld within 1/2″ of the end of the flange break. The fastener should be placed no closer than 3/4″ or further than 1″ from the face of the flange.
Continue in the same direction around the duct at evenly spaced intervals, as noted below left. Place the last fastener within 1/2″ of the end of the duct flange.
Optional mig welding around Accu- Flange to duct 10″ center. Assure button welds cover 50% onto duct and 50% onto flange for a strong weld.
Seal lap joint internally with approved duct sealer used in the HVAC industry. Brush the sealer into the joint achieving a 100% seal.
Apply neoprene gasket 5/16″ thick by 8 3/4″ wide to the face of round Accu- Flange parallel with inside edge.
Apply neoprene gasket completely around one of the AccuFlange ring to the beginning point. When the gasket meets, cut square so the ends butt up against each other.
Align mating frames by matching the AccuFlange ring evenly around the circumference.
Clamp the mating Accuflange rings compressing the gasket until the mating rings touch.
Fastener Spacing Recommendations 8″ – 18″ duct – 8″ on center 20″ – 28″ duct – 12″ on center 30″ and larger duct – 18″ on center
* Because most spiral duct is not true to size it may be necessary to cut a larger gap in the flange at the break. There must be a gap at the break. Frequently a contractor installing a high velocity duct system will employ a duct joint with which either he or his work force have no experience. In such a case, it is strongly recommended that the contractor promptly test the initial 100 to 300 feet of duct before installing any more duct. This test will quickly reveal whether or not the workmen can make this joint air-tight in an economical manner. Reprinted from SMACNA High Pressure Manual.
Fasten #10 tec screws 6″ on center around the circumference of the flange face. In order to assure a proper closed joint, the rings should be clamped tightly together with the two faces touching each other prior to fastening the tec screw. Proper care should be taken in setting the clutch adjustment of your screw gun to assure your screws have 100% holding strength.