IHPSV4.5L48 | 48" Rigid Pipe Length | SV4.5" and 7.5" Concentric Vent | 77L74 | IHP570440185SKU:77L74Inventory ID:03613115Select Item:Price: $203.00Quantity: 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. SV4.5L48 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