{"product_id":"fantech-rsk-04-spring-loaded-damper-4-inches","title":"Fantech Rsk 04 Spring-loaded Damper 4 Inches","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\u003cp\u003eThe FANTECH RSK 04 is a 4-inch spring-loaded damper designed for duct ventilation applications. The spring-loaded mechanism allows the damper to open under airflow and return to a closed position when airflow stops, helping to prevent backdraft and maintain system efficiency. This type of damper is commonly installed by HVAC technicians as part of residential or light commercial ventilation systems, including exhaust and supply duct runs. The RSK 04 is sold as a single unit and fits 4-inch duct connections.\u003c\/p\u003e\u003cp\u003eThis damper is suited for use in forced-air ventilation ductwork where passive backdraft control is needed. Typical installations include bathroom exhaust systems, kitchen ventilation runs, and ERV or HRV duct connections. Its spring-loaded action requires no external power source or actuator, making it a straightforward mechanical solution for airflow directional control in 4-inch duct systems.\u003c\/p\u003e\u003ch4\u003eKey Features\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003eSpring-loaded design opens with airflow and closes automatically when airflow stops\u003c\/li\u003e\n\u003cli\u003e4-inch duct size fits standard residential and light commercial duct connections\u003c\/li\u003e\n\u003cli\u003ePassive mechanical operation with no actuator or power source required\u003c\/li\u003e\n\u003cli\u003eHelps prevent backdraft in exhaust and supply duct applications\u003c\/li\u003e\n\u003cli\u003eSold individually as a single unit\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eCompatibility\u003c\/h4\u003e\u003cp\u003eDesigned as an OEM-style replacement or new-installation damper for 4-inch duct ventilation systems in residential and light commercial HVAC applications.\u003c\/p\u003e\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\u003cp\u003eInstallation is typically performed by a licensed HVAC technician. Shut down the ventilation system and confirm power is off before beginning duct work. Verify duct diameter and ensure a proper sealed connection to prevent air leakage. Follow local mechanical codes and manufacturer guidelines for damper orientation relative to airflow direction.\u003c\/p\u003e\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type\u003c\/strong\u003e: Spring-Loaded Damper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDuct Size\u003c\/strong\u003e: 4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSelling Unit\u003c\/strong\u003e: Single\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel\u003c\/strong\u003e: RSK4\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch4\u003eStandard Information\u003c\/h4\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: FANTECH\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: RSK 04\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"FANTECH","offers":[{"title":"Default Title","offer_id":68083093340466,"sku":"RSK 04","price":29.37,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/df71f369aaa3740dc52296f95dd8d39d.jpg?v=1793163297","url":"https:\/\/voomisupply.com\/products\/fantech-rsk-04-spring-loaded-damper-4-inches","provider":"Voomi Supply","version":"1.0","type":"link"}