Replacement spring on these furnace models using soleniods on the primary air intake assemblies. -Classic Edge 350/550/750 with molded elbow. -Classic Edge 750 with steel elbow. -E-Classic 3250 with molded elbow. -E-Classic 1400/1450/2300/2400/3200 with steel elbow. -Classic 4030/5036/6048 with molded elbow on steel firebox door. Replacement spring for vent cap on Classic Edge 360/560/760/960, CleanFire 300/500/700/900, and Classic/Pallet Burner models.