{"product_id":"io-hvac-controls-md-1818-zone-damper-18x18-in-2-position","title":"Io Hvac Controls MD-1818 Zone Damper 18x18 in 2 Position","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe IO HVAC CONTROLS MD-1818 is an 18 x 18 inch rectangular 2-position zone damper designed for zoned HVAC duct systems. It controls airflow to individual zones by opening or closing on a call for heating or cooling. The unit ships with a Belimo 3-wire actuator that drives the damper blade between fully open and fully closed positions. Licensed HVAC technicians install this damper as part of a residential or light commercial zoning system, typically paired with a zone control board and thermostat wiring. At 11 pounds, the damper is substantial enough for large rectangular trunk or branch duct runs.\u003c\/p\u003e\n\u003cp\u003eThe MD-1818 is sized for 18 x 18 inch rectangular duct openings, making it suitable for high-volume branch runs or main trunk applications in residential and light commercial forced-air systems. The 2-position operation means the actuator drives fully open on a zone call and returns to closed when the zone is satisfied, which is the standard control method for most residential zoning panels. The Belimo 3-wire actuator provides reliable on\/off actuation with spring return, a common requirement for zone damper applications where fail-safe positioning is needed.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e18 x 18 inch rectangular form factor fits large duct openings in residential and light commercial systems\u003c\/li\u003e\n  \u003cli\u003e2-position operation provides fully open and fully closed damper states for zone isolation\u003c\/li\u003e\n  \u003cli\u003eIncludes Belimo 3-wire actuator for dependable, low-voltage on\/off actuation\u003c\/li\u003e\n  \u003cli\u003eSpring-return actuator design supports fail-safe positioning on loss of power\u003c\/li\u003e\n  \u003cli\u003eOverall package dimensions of 21 x 25 x 8 inches accommodate standard duct-side installation clearances\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch4\u003eCompatibility\u003c\/h4\u003e\n\u003cp\u003eDesigned as an OEM-style rectangular zone damper for forced-air HVAC zoning systems requiring an 18 x 18 inch duct opening with a 3-wire low-voltage actuator interface.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a licensed HVAC technician familiar with duct zoning systems and low-voltage wiring practices. Shut down the air handler and de-energize all control wiring before cutting into ductwork or connecting actuator leads. Secure the damper frame to the duct per sheet metal best practices and verify blade orientation matches the intended airflow direction before making control wiring connections. Consult the zone control panel manufacturer's wiring diagram for correct 3-wire actuator terminal assignments.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDuct Opening Width\u003c\/strong\u003e: 18 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDuct Opening Height\u003c\/strong\u003e: 18 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDamper Type\u003c\/strong\u003e: Rectangular 2 Position\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eActuator\u003c\/strong\u003e: Belimo 3 Wire\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Width\u003c\/strong\u003e: 21 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Height\u003c\/strong\u003e: 25 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePackage Depth\u003c\/strong\u003e: 8 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWeight\u003c\/strong\u003e: 11 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: MD-1818\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"IO HVAC CONTROLS","offers":[{"title":"Default Title","offer_id":67949703921970,"sku":"MD-1818","price":317.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/50bbd6f74b2edbde3fa9d504fe30cd5d_5e1a3bb8-ab3d-4374-8099-689b64c3d844.jpg?v=1791698479","url":"https:\/\/voomisupply.com\/products\/io-hvac-controls-md-1818-zone-damper-18x18-in-2-position","provider":"Voomi Supply","version":"1.0","type":"link"}