IHPSV4.5FB | 7/12 to 12/12 Adjustable Flashing | SV4.5" and 7.5" Concentric Vent | 77L80 | IHP570440197SKU:77L80Inventory ID:03611717Select Item:Price: $162.00Quantity: Roof Flashing is based on roof pitch (rise over 12" run). Storm collar is supplied with the flashing. SV4.5FB venting component is used on some Astria, Superior, and Lennox gas burning direct vent fireplaces. Check your model's Installation Manual for listed Secure Vent Components. Reviews Choose your rating12345