IHPSV4.5L24 | 24" Rigid Pipe Length | SV4.5" and 7.5" Concentric Vent | 77L72 | IHP570440181SKU:77L72Inventory ID:03611721Select Item:Price: $128.00Quantity: Sections of vent can be combined. Manuals have length parameters for a variety of applications. The dimpled end of the vent components fit over the fireplace vent collar. Featuring positive twist lock connections. Effective length will be 1-1/2” shorter. SV4.5L24 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