IHPSFKIT36S | Horizontal Flex Vent Kit | 4.5" and 7.5" X 36" to 72" Length | 77L90 | IHP570440227SKU:77L90Inventory ID:03613111Select Item:Price: $481.00Quantity: Secure Flex venting kits and components may be used in any venting application in place of rigid Secure Vent (SV4.5) direct vent components. SFKIT36S kit includes one 4.5" diameter and one 7.5" diameter flexible vent, flex adapter, firestop / spacer, two 4.5" and two 7.5" clamps, and Square Termination SFKIT36 venting component is used on some Astria, Superior, and Lennox gas burning direct vent fireplaces. Check your model's Installation Manual for listed Secure Flex Components. Reviews Choose your rating12345