{"product_id":"master-flow-3-1-4-in-x-10-in-rectangular-stack-duct-starting-collar","title":"Master Flow 3-1\/4 in. x 10 in. Rectangular Stack Duct Starting Collar","description":"\u003cp\u003eThis Master Flow 3-1\/4 in. x 10 in. Rectangular Stack Duct Starting Collar is constructed from durable 30-gauge galvanized steel to ensure rust resistance and long-lasting performance. Designed for HVAC applications, it provides a secure transition from flat surfaces, such as duct board or lined plenums, to 3-1\/4 in. x 10 in. stack ducts. The collar features extra-long tabs for easy installation and a tight seal, helping to optimize system efficiency and airflow. It can be easily installed using sheet-metal screws\u003c\/p\u003e","brand":"Master Flow","offers":[{"title":"Default Title","offer_id":45723274215610,"sku":"897113","price":21.98,"currency_code":"USD","in_stock":false}],"url":"https:\/\/www.loopstone.net\/products\/master-flow-3-1-4-in-x-10-in-rectangular-stack-duct-starting-collar","provider":"Loopstone Store","version":"1.0","type":"link"}