{"product_id":"io-hvac-controls-hd-na-1820-zone-damper-18x20-no-actuator","title":"Io Hvac Controls HD-NA-1820 Zone Damper 18x20 No Actuator","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe IO HVAC CONTROLS HD-NA-1820 is a two-position zone damper sized at 18 x 20 inches, supplied without an actuator and configured for a 5\/8-to-1\/2-inch shaft. Zone dampers are installed inside ductwork to control airflow to individual zones in a multi-zone HVAC system. This damper opens and closes in response to zone calls from a zone control panel, directing conditioned air where it is needed and shutting off flow to idle zones. At 14 pounds, it is a substantial assembly suited for commercial-grade or larger residential zoning applications. Licensed HVAC technicians and sheet metal contractors are the typical installers.\u003c\/p\u003e\n\u003cp\u003eThis damper is designed for use in forced-air zoning systems where the actuator is sourced or already installed separately. The no-actuator configuration allows integration with a contractor-supplied actuator that matches the existing system design. Typical install scenarios include new multi-zone residential systems and commercial rooftop-unit zoning retrofits where the installer specifies the actuator independently. The 18 x 20 inch blade size fits larger trunk or branch ducts common in light-commercial and larger residential installations.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003eTwo-position operation: fully open or fully closed for straightforward zone control\u003c\/li\u003e\n  \u003cli\u003eSupplied without actuator, allowing the installer to select a compatible actuator separately\u003c\/li\u003e\n  \u003cli\u003e5\/8-to-1\/2-inch shaft configuration for flexible actuator mounting\u003c\/li\u003e\n  \u003cli\u003e18 x 20 inch blade size suits larger duct openings in residential and light-commercial systems\u003c\/li\u003e\n  \u003cli\u003e14-pound assembly constructed for durable in-duct service\u003c\/li\u003e\n  \u003cli\u003eOverall cabinet dimensions of 23 x 25 x 10 inches allow for accurate rough-in planning\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style replacement or new-installation zone damper for forced-air multi-zone HVAC systems requiring an 18 x 20 inch two-position damper with a 5\/8-to-1\/2-inch shaft; actuator must be sourced and matched separately.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a licensed HVAC technician or qualified sheet metal contractor. Shut down and lock out the air-handling unit before mounting the damper in the duct. Confirm actuator shaft compatibility before final assembly, and verify that the zone control panel output signal matches the actuator being used. Follow local mechanical codes and manufacturer wiring guidelines when connecting the actuator to the zone control board.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBlade Size\u003c\/strong\u003e: 18 x 20 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eShaft Size\u003c\/strong\u003e: 5\/8 to 1\/2 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eActuator Included\u003c\/strong\u003e: No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperation Type\u003c\/strong\u003e: Two-Position\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOverall Dimensions (W x H x D)\u003c\/strong\u003e: 23 x 25 x 10 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 14 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eStandard Information\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBrand\u003c\/strong\u003e: IO HVAC CONTROLS\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number\u003c\/strong\u003e: HD-NA-1820\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"IO HVAC CONTROLS","offers":[{"title":"Default Title","offer_id":51437921304882,"sku":"HD-NA-1820","price":255.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/313288300.jpg?v=1783449859","url":"https:\/\/voomisupply.com\/products\/io-hvac-controls-hd-na-1820-zone-damper-18x20-no-actuator","provider":"Voomi Supply","version":"1.0","type":"link"}