{"product_id":"air-flow-products-77f182318-transition-boot-18x23-18","title":"Air Flow Products 77F182318 Transition Boot 18x23-18","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe AIR FLOW PRODUCTS 77F182318 is a straight transition boot with flange designed to connect square or rectangular ductwork to a round collar in forced-air HVAC systems. The boot transitions from an 18 by 23 inch rectangular opening down to an 18 inch round collar, making it a critical fitting wherever duct geometry changes between trunk lines and branch runs. The flanged design provides a secure, stable mounting surface against ceilings, floors, or framing. Licensed HVAC technicians and sheet metal contractors install this fitting during new construction and duct retrofit work.\u003c\/p\u003e\u003cp\u003eThis transition boot is suited for residential and light commercial forced-air applications where a square-to-round conversion is needed at a register, grille, or inline duct junction. It is commonly installed at the plenum-to-trunk or trunk-to-branch transition point and is appropriate for supply or return duct configurations depending on system layout and static pressure requirements.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eStraight-body design keeps airflow transition gradual and consistent\u003c\/li\u003e\n\u003cli\u003eIntegrated flange provides a solid mounting surface for register or grille attachment\u003c\/li\u003e\n\u003cli\u003eSquare-to-round geometry accommodates rectangular trunk to round branch transitions\u003c\/li\u003e\n\u003cli\u003e18 by 23 inch rectangular inlet matches common trunk duct sizing\u003c\/li\u003e\n\u003cli\u003e18 inch round collar outlet connects directly to standard round duct or flex duct\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style sheet metal fitting compatible with standard forced-air duct systems using 18 by 23 inch rectangular openings and 18 inch round collars.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation should be performed by a licensed HVAC technician or qualified sheet metal contractor in accordance with SMACNA ductwork standards and applicable local mechanical codes. Power down the air handler and confirm the system is depressurized before making connections at the plenum or trunk line. Seal all joints with listed duct sealant or foil-backed tape rated for HVAC use. Support the fitting per local code requirements to prevent strain on adjoining ductwork.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInlet Size\u003c\/strong\u003e: 18 x 23 inches rectangular\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCollar Diameter\u003c\/strong\u003e: 18 inches round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBoot Style\u003c\/strong\u003e: Straight with Flange\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTransition Type\u003c\/strong\u003e: Square to Round\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: AIR FLOW PRODUCTS\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: 77F182318\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"AIR FLOW PRODUCTS","offers":[{"title":"Default Title","offer_id":51344910123314,"sku":"77F182318","price":82.82,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/310552936.jpg?v=1782045232","url":"https:\/\/voomisupply.com\/products\/air-flow-products-77f182318-transition-boot-18x23-18","provider":"Voomi Supply","version":"1.0","type":"link"}