{"product_id":"io-hvac-controls-rm-1818-rectangular-zone-damper-18x18","title":"Io Hvac Controls RM-1818 Rectangular Zone Damper 18x18","description":"\u003ch3\u003eProduct Description\u003c\/h3\u003e\n\u003cp\u003eThe IO HVAC CONTROLS RM-1818 is an 18-inch by 18-inch rectangular zone damper designed for use in ducted HVAC zoning systems. It ships with a 35-second Belimo actuator wired on a 3-wire configuration, enabling controlled open and close positioning driven by a zone control board or thermostat signal. The damper regulates conditioned airflow to individual zones within a forced-air system, helping balance heating and cooling distribution across the structure. Licensed HVAC technicians install this unit as part of a multi-zone system retrofit or new construction zoning layout.\u003c\/p\u003e\n\u003cp\u003eThis damper is suited for residential and light commercial forced-air zoning applications where rectangular duct configurations are present. The 18-inch by 18-inch face size accommodates larger trunk or branch duct runs common in multi-zone residential systems. The 3-wire Belimo actuator provides reliable spring-return or floating-point control depending on system wiring, making it compatible with most standard zone control panels that support 3-wire actuator inputs. The 35-second stroke time allows smooth, controlled blade travel that minimizes pressure transients in the duct system.\u003c\/p\u003e\n\u003ch4\u003eKey Features\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e18-inch by 18-inch rectangular face size fits standard large-format duct openings\u003c\/li\u003e\n  \u003cli\u003eIntegrated 35-second Belimo actuator for controlled, consistent blade positioning\u003c\/li\u003e\n  \u003cli\u003e3-wire actuator wiring configuration compatible with most residential zone control boards\u003c\/li\u003e\n  \u003cli\u003eRectangular damper body designed for straightforward inline duct installation\u003c\/li\u003e\n  \u003cli\u003ePackage dimensions of 21 inches wide by 25 inches tall by 8 inches deep for shipping and storage planning\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 zoning systems requiring an 18-inch by 18-inch damper with a 3-wire Belimo actuator. The raw title references Rheem system compatibility; verify with the zone panel manufacturer before installation.\u003c\/p\u003e\n\u003ch4\u003eInstallation Notes\u003c\/h4\u003e\n\u003cp\u003eInstallation should be performed by a licensed HVAC technician. De-energize the air handler and zone control panel before wiring or mounting the damper. Secure the damper inline with the duct using sheet metal screws and seal all joints with foil tape or mastic per applicable mechanical codes. Verify actuator wiring polarity and control signal type against the zone control board documentation before powering the system.\u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications\u003c\/h4\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDamper Face Width\u003c\/strong\u003e: 18 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDamper Face Height\u003c\/strong\u003e: 18 inches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eActuator Stroke Time\u003c\/strong\u003e: 35 seconds\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eActuator Wiring\u003c\/strong\u003e: 3-wire\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eActuator Brand\u003c\/strong\u003e: Belimo\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: 11.73 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: RM-1818\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"IO HVAC CONTROLS","offers":[{"title":"Default Title","offer_id":67949734166834,"sku":"RM-1818","price":333.55,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0270\/4519\/9983\/files\/745ecffd07cbe47f75f5847deb081dca_ef2f1096-f895-424a-846a-1dc3f9e712d1.jpg?v=1791699581","url":"https:\/\/voomisupply.com\/products\/io-hvac-controls-rm-1818-rectangular-zone-damper-18x18","provider":"Voomi Supply","version":"1.0","type":"link"}