Competitive Cross-Reference
Product Selection Tool
Competitive Cross-Reference: Competitor Part Number to Hoyme Equivalent
Type any Honeywell Home (Resideo), EWC Controls, Zonefirst, AprilAire, Field Controls, Effikal or Skuttle part number to find the Hoyme damper that replaces it. Covers round zone dampers, fresh air and make-up air dampers, rectangular and slip-in dampers, modulating and floating point dampers, and gas vent dampers. Free technical support at 1-800-661-7382.
No match for that part number
Check the spelling, or try just the numeric portion, for example 6606 rather than AprilAire 6606. If the part is not listed, call 1-800-661-7382 and technical support will identify the equivalent, confirm the action code and check the diameter. That service is free to contractors, installers and wholesalers.
Start here
Understanding Damper Action
Most cross-reference errors come from action codes, not sizes. Confirm the action before you confirm the diameter. Hoyme action is factory set, so it has to be correct on the purchase order.
| Code | Hoyme action | Behaviour on power loss | Typical use |
|---|---|---|---|
| OPC | Power close, spring open fail-safe | Springs open on loss of power. Matches a normally open zone damper. | Zone dampers, heat and cool distribution. |
| OPO | Power open, spring close fail-safe | Springs closed on loss of power. Matches a normally closed damper. | Fresh air intake, make-up air, combustion air, exhaust. |
| OPP | Power open and power close | Floating point, 3 wire. No spring return, holds last position. | Modulating, BAS and DDC controlled applications. |
Manufacturer
Honeywell Home (Resideo) to Hoyme
The Honeywell Home line uses the TrueZONE family designations. ARD and ZD dampers ship power close with spring open. EARD dampers ship power open with spring close. Current production part numbers carry a TZ suffix and may carry a /U packaging suffix. ARD8TZ and ARD8TZ/U are the same damper.
| Honeywell | Description | Hoyme equivalent | Notes |
|---|---|---|---|
| ARD5TZ | 5 in. round automatic damper | HAC-0510-OPC | Direct equivalent. End switch and relay versions available. |
| ARD6TZ | 6 in. round automatic damper | HAC-0610-OPC | Direct equivalent. |
| ARD7TZ | 7 in. round automatic damper | HAC-0710-OPC | Direct equivalent. |
| ARD8TZ | 8 in. round automatic damper | HAC-0810-OPC | Direct equivalent. ARD8TZ and ARD8TZ/U are the same damper. |
| ARD9TZ | 9 in. round automatic damper | HAC-0910-OPC | Direct equivalent. Largest size in the standard Hoyme spring drive. |
| ARD10TZ | 10 in. round automatic damper | HAC-1050-OPC | Hoyme uses a quarter-turn actuator at 10 in. and above. |
| ARD12TZ | 12 in. round automatic damper | HAC-1250-OPC | Largest size in the quarter-turn actuator range. |
| ARD14TZ | 14 in. round automatic damper | HAC-40 Series, 14 in. | Belimo TFB24, on/off with spring return. Built to order. |
| ARD16TZ | 16 in. round automatic damper | HAC-40 Series, 16 in. | Belimo TFB24. Built to order. |
| ARD18TZ | 18 in. round automatic damper | HAC-40 Series, 18 in. | Belimo TFB24. Built to order. |
| ARD20TZ | 20 in. round automatic damper | HAC-40 Series, 20 in. | Belimo TFB24. Built to order. |
| Honeywell | Description | Hoyme equivalent | Notes |
|---|---|---|---|
| EARD5TZ | 5 in. fresh air damper | HAC-0510-OPO | Direct equivalent. |
| EARD6TZ | 6 in. fresh air damper | HAC-0610-OPO | Direct equivalent. Most common ventilation size. |
| EARD7TZ | 7 in. fresh air damper | HAC-0710-OPO | Direct equivalent. |
| EARD8TZ | 8 in. fresh air damper | HAC-0810-OPO | Direct equivalent. Largest EARD size. |
| Hoyme exclusive | 9 in. fresh air damper | HAC-0910-OPO | Hoyme carries 9 in. in the standard spring drive. Honeywell does not. |
| Hoyme exclusive | 120Vac inline fresh air damper | HAC-12 Series, 4 to 9 in. | Runs on line voltage. No control transformer required. |
| Hoyme exclusive | Factory insulated cold climate damper | HAC-L Series, 4 to 9 in. | Reduces condensation on cold intake ducts. |
| Hoyme exclusive | Heat bypass damper | HAC-H Series, 4 to 9 in. | 10 percent bypass blade. Helps prevent freeze-up on single-speed furnaces. |
| Hoyme exclusive | Motorized elbow damper | HAC-E Series, 5 to 9 in. | Replaces a 90 degree elbow. No duct modification required. |
| Honeywell | Hoyme equivalent | Honeywell | Hoyme equivalent |
|---|---|---|---|
| ZD8X8TZ | HCR/HSI-0808 | ZD10X14TZ | HCR/HSI-1014 |
| ZD8X10TZ | HCR/HSI-0810 | ZD10X16TZ | HCR/HSI-1016 |
| ZD8X12TZ | HCR/HSI-0812 | ZD12X8TZ | HCR/HSI-1208 |
| ZD8X14TZ | HCR/HSI-0814 | ZD12X10TZ | HCR/HSI-1210 |
| ZD8X16TZ | HCR/HSI-0816 | ZD14X8TZ | HCR/HSI-1408 |
| ZD8X18TZ | HCR/HSI-0818 | ZD14X12TZ | HCR/HSI-1412 |
| ZD8X20TZ | HCR/HSI-0820 | ZD16X8TZ | HCR/HSI-1608 |
| ZD10X8TZ | HCR/HSI-1008 | ZD16X10TZ | HCR/HSI-1610 |
| ZD10X10TZ | HCR/HSI-1010 | ZD18X8TZ | HCR/HSI-1808 |
| ZD10X12TZ | HCR/HSI-1012 | ZD20X8TZ | HCR/HSI-2008 |
| Honeywell | Description | Hoyme equivalent | Notes |
|---|---|---|---|
| MARD6 | 6 in. modulating round damper | HAC-0630-OPP | Belimo LMB24-3-T. Floating point, no spring return. |
| MARD8 | 8 in. modulating round damper | HAC-0830-OPP | Belimo LMB24-3-T. |
| MARD10 | 10 in. modulating round damper | HAC-1030-OPP | Belimo LMB24-3-T. |
| MARD12 | 12 in. modulating round damper | HAC-1230-OPP | Belimo LMB24-3-T. |
| MARD14 | 14 in. modulating round damper | HAC-34 Series, 14 in. | Belimo CMB24-3-T, higher torque for large duct. Built to order. |
| MARD16 | 16 in. modulating round damper | HAC-34 Series, 16 in. | Belimo CMB24-3-T. Built to order. |
| MARD18 | 18 in. modulating round damper | HAC-34 Series, 18 in. | Belimo CMB24-3-T. Built to order. |
| Hoyme exclusive | True analog 2 to 10VDC modulating round damper | HAC-43 or HAC-60 | The MARD is floating point, not analog. Specify HAC-43 (TFB24-SR-T) or HAC-60 (LMB24-SR-T) where a 2 to 10VDC signal is required. |
| Hoyme exclusive | Floating point damper on 100 to 230Vac | HAC-35 or HAC-70 | HAC-35 uses Belimo CMB120-3. HAC-70 uses Belimo LMX120-3 and is power open only. |
Manufacturer
EWC Controls (Ultra-Zone) to Hoyme
EWC round dampers are ordered as the size followed by the series, for example 6 RSD. The RSD ships power close with spring open and can be field reversed to power open with spring close. Hoyme supplies the correct action from the factory, so no field conversion is required.
| EWC | Description | Hoyme equivalent | Notes |
|---|---|---|---|
| 4 RSD to 9 RSD | Round spring return damper, 24Vac, power close and spring open | HAC-0410-OPC to HAC-0910-OPC | Direct equivalent. Match the diameter. |
| 10 RSD, 12 RSD | Round spring return damper, 24Vac | HAC-1050-OPC, HAC-1250-OPC | Quarter-turn actuator range. |
| 14 RSD to 20 RSD | Round spring return damper, 24Vac | HAC-40 Series, 14 to 20 in. | Belimo TFB24 actuator. Built to order. |
| RSD, field reversed | Reversed to power open and spring close | HAC-xx10-OPO, 4 to 9 in. | Specify OPO. Hoyme supplies the correct action from the factory. |
| URD-SRE120 | 120V round spring return damper, 4 to 16 in. | HAC-12 Series (4 to 9 in.), HAC-44 Series (6 to 20 in.) | HAC-12 is the direct 120Vac line. HAC-44 uses a Belimo TFB120 for larger duct. |
| ND, ND-RSD | Rectangular zone damper, power open and power close or spring return | HCR/HSI custom, 6 to 36 in. | Built to order and non-returnable. Confirm dimensions and action code. |
| SID | Slip-in retrofit damper, 4 to 10 in. | HSI slip-in type | Retrofit without replacing a duct section. |
| ND-L, ND-MQ | Damper body only, hex shaft or manual quadrant | HAC No Motor (6 to 30 in.), HAC-MBD (4 to 14 in.) | HAC No Motor accepts a field-supplied actuator on an extended shaft. |
| ND-LF24, ND-LF120 | Belimo spring return actuators | HAC-40 Series, HAC-44 Series | Same Belimo actuator families. |
| ND-LM24SR-T | Modulating actuator, 2 to 10VDC | HAC-43 Series, HAC-60 Series | Same Belimo actuator families. |
Manufacturer
Zonefirst to Hoyme
Zonefirst supplies the reversed action as a separate model number rather than as a field conversion. Match the model letter to the Hoyme action code. Sizes run 4, 5, 6, 7, 8, 9, 10, 12, 14, 16, 18 and 20 in.
| Zonefirst | Description | Hoyme equivalent | Notes |
|---|---|---|---|
| RDS | Round zone damper, 24Vac 2 wire, power close and spring open | HAC-xx10-OPC (4 to 9 in.), HAC-xx50-OPC (10 and 12 in.), HAC-40 Series (14 to 20 in.) | Direct equivalent. Confirm the action code. |
| RDSC | Round zone damper, spring close and power open | HAC-xx10-OPO, 4 to 9 in. | Direct equivalent for fresh air and make-up air. |
| RDM | Round zone damper, 24Vac 3 wire, power open and power close | HAC-xx30-OPP | Belimo LMB24-3-T. Floating point, no spring return. |
Manufacturer
AprilAire to Hoyme
Cross-reference for the AprilAire 6000 series zone and rectangular dampers. Rectangular dampers are built to order and non-returnable, and the action code must be specified.
| AprilAire | Description | Hoyme equivalent | Notes |
|---|---|---|---|
| 6606 | 6 in. round zone damper, normally open | HAC-0610-OPC | Direct equivalent. |
| 6608 | 8 in. round zone damper, normally open | HAC-0810-OPC | Direct equivalent. |
| 6609 | 9 in. round zone damper, normally open | HAC-0910-OPC | Direct equivalent. |
| 6610 | 10 in. round zone damper, normally open | HAC-1050-OPC | Quarter-turn actuator range. |
| 6612 | 12 in. round zone damper, normally open | HAC-1250-OPC | Quarter-turn actuator range. |
| 6506 | 6 in. round damper, normally closed | HAC-0610-OPO | Direct equivalent. |
| 6508 | 8 in. round damper, normally closed | HAC-0810-OPO | Direct equivalent. |
| 6606W3 | 6 in. round damper, 3 wire power open and power close | HAC-0630-OPP | Belimo LMB24-3-T. Floating point, no spring return. |
| 6812 | 8 x 10 rectangular damper | HCR/HSI-0810 | Built to order. Specify action code. |
| 6813 | 8 x 12 rectangular damper | HCR/HSI-0812 | Built to order. Specify action code. |
| 6814 | 8 x 14 rectangular damper | HCR/HSI-0814 | Built to order. Specify action code. |
| 6815 | 8 x 16 rectangular damper | HCR/HSI-0816 | Built to order. Specify action code. |
| 6816 | 8 x 18 rectangular damper | HCR/HSI-0818 | Built to order. Specify action code. |
| 6817 | 8 x 20 rectangular damper | HCR/HSI-0820 | Built to order. Specify action code. |
| 6732 | 10 x 10 rectangular damper | HCR/HSI-1010 | Built to order. Specify action code. |
| 6823 | 10 x 12 rectangular damper | HCR/HSI-1012 | Built to order. Specify action code. |
| 6824 | 10 x 14 rectangular damper | HCR/HSI-1014 | Built to order. Specify action code. |
| 6825 | 10 x 16 rectangular damper | HCR/HSI-1016 | Built to order. Specify action code. |
| 6826 | 10 x 18 rectangular damper | HCR/HSI-1018 | Built to order. Specify action code. |
| 6827 | 10 x 20 rectangular damper | HCR/HSI-1020 | Built to order. Specify action code. |
Manufacturer
Field Controls and Effikal to Hoyme, Gas Vent Dampers
| Field Controls / Effikal | Description | Hoyme equivalent | Notes |
|---|---|---|---|
| GVD-4 to GVD-9 | Gas vent damper, 4 to 9 in., 24Vac, stainless steel, dual safety switches | HAC-F, 4 to 9 in. | CSA certified. Spring open with 10 percent bypass. |
| GVD-10, GVD-12 | Gas vent damper, 10 and 12 in., 24Vac | HAC-F, 10 and 12 in. | CSA certification extends to 12 in. |
| RVGP series | Effikal gas vent damper, 24Vac | HAC-F Series | Effikal RVGP and Field Controls GVD cross to one another. Match the vent diameter. |
| GVD-UWK | 8 ft wiring harness with conduit, sold separately | Not required | Hoyme dampers ship pre-wired. |
| Hoyme exclusive | Commercial boilers and large furnaces, 10 to 30 in. | HAC-F Large | CSA certification of the flue damper extends to 12 in. Sizes above 12 in. are supplied as uncertified product. Confirm acceptance by the authority having jurisdiction in writing before specifying or installing. |
| Hoyme exclusive | Special application flue damper | HAC-FS | Not CSA certified. Confirm acceptance with the authority having jurisdiction before specifying. |
Manufacturer
Skuttle to Hoyme, Make-Up Air Controls
The Skuttle 216 is a passive barometric flap that opens when the furnace blower runs. It has no electrical connection, so it cannot be interlocked to an appliance or sequenced with an exhaust fan, and it does not positively seal when the system is off. Where a controlled and positively sealed intake is required, specify a motorized damper.
| Skuttle | Description | Hoyme equivalent | Notes |
|---|---|---|---|
| 216-1 | Make-up air control, 6 in. duct, barometric, no electrical connection | HAC-0610-OPO with OOH or MOH hood, or MAC terminating-end damper | Motorized, 24Vac, spring close on loss of power. Interlocks to the appliance or ventilation control. |
| 216-2 | Make-up air control, 4 in. duct, barometric, no electrical connection | HAC-0410-OPO with hood | Motorized, 24Vac, spring close on loss of power. |
| Hoyme exclusive | Interlocked ventilation sequence with exhaust fan and furnace fan | ADP Series relay adaptors | Pre-wired interlock. Opens the fresh air damper and starts the furnace fan during ventilation. |
No cross-reference to make
Hoyme Products With No Equivalent in the Lines Above
These products cover applications the manufacturers on this page do not serve. Where a job calls for one of them, there is no substitution to evaluate.
| Hoyme product | Description | Application notes |
|---|---|---|
| HOM Series | Combustion air damper, 4 to 9 in., 24Vac, spring return | CSA certified. Interlocks to one appliance (SF1) or two appliances (SF2) with an end proving switch. |
| MOH Series | Motorized all-weather hood, 4 to 8 in., 24Vac | CSA certified. Seals at the wall to stop cold air infiltration. |
| MAC Series | Terminating-end damper, 4 to 9 in., 24Vac | CSA certified. Replaces the exterior hood. |
| HAC-F Series | Motorized flue damper, 4 to 9 in., with 10 to 30 in. available for commercial | Spring open fail-safe, never restricts the flue on loss of power. CSA certification extends to 12 in.; larger sizes are uncertified product requiring written acceptance by the authority having jurisdiction. |
| ADP Series | Damper interlock relay adaptor, 24Vac, 120Vac and millivolt | Factory pre-wired interlock for combustion air, fresh air, gas dryer, timer and two-zone sequences. Over 80 published colour wiring diagrams. |
| PFS Series | Positive flow switch, 24Vac or 120Vac, 4 to 9 in. | Proves actual airflow rather than damper blade position. Suitable for BAS and DDC applications. |
| BDD, BDH | Back draft damper (3 to 24 in.) and back draft hood (4 to 12 in.) | No power required. BDD mounts inline in any orientation. BDH mounts on the exterior wall with an optional end switch. |
| OOH Series | Passive all-weather inlet hood, 4 to 12 in. | No power required. Fixed or removable screen. Metal or white finish. |
| HAC-MBD | Manual balance damper, 4 to 14 in. | No power required. Infinitely adjustable blade for round duct balancing. |
| HAC-90, HAC-80 | Fire and smoke dampers, 24Vac and 120Vac | Belimo FSLF actuators, UL 555S listed. Requires consultation with the authority having jurisdiction and engineer sign-off. |
| HAE | Furnace fan air exchanger, 84 percent sensible effectiveness | Uses the furnace fan. No electricity and no defrost cycle. Tested by NRC Canada at the CCHT twin research houses. Lifetime core warranty. |
Reference
Hoyme Part Number Guide and Competitor Prefixes
Round Hoyme dampers are built as HAC, then a two digit diameter, then a two digit actuator series, then the action code. For example, HAC-1050-OPC is a 10 inch damper on the quarter-turn actuator, power close with a spring open fail-safe.
| Series | Actuator | Notes |
|---|---|---|
| 00 | No motor | Passive or body-only build. |
| 10 | Stall-protected Hoyme spring motor drive, 24Vac | The standard product. 2 to 9 in. |
| 11 | Stall-protected spring motor drive with relay | Where an interlock relay is required at the damper. 4 to 9 in. |
| 12 | 120Vac inline damper | 4 to 9 in. No control transformer required. |
| 30 | Belimo LMB24-3-T | Floating point, 24Vac, small duct, no spring return. |
| 34 | Belimo CMB24-3-T | Floating point, 24Vac, high torque, no spring return. |
| 35 | Belimo CMB120-3 | Floating point, 100 to 230Vac, no spring return. |
| 40 | Belimo TFB24 | On/off with spring return, 24Vac, 6 to 20 in. |
| 43 | Belimo TFB24-SR-T | Modulating 2 to 10VDC, 24Vac, holds last position. |
| 44 | Belimo TFB120 | On/off with spring return, 100 to 240Vac, 6 to 20 in. |
| 50, 51 | Quarter-turn actuator | On/off with spring return, 24Vac. The 51 adds an end switch for ADP interlock. |
| 60 | Belimo LMB24-SR-T | Modulating 2 to 10VDC, 24Vac, small duct. |
| 70 | Belimo LMX120-3 | Floating, 100 to 230Vac, power open only. |
| 80, 90 | Belimo FSLF120 and FSLF24 | Fire and smoke, UL 555S listed. |
| Prefix | Manufacturer | Meaning |
|---|---|---|
| ARD | Honeywell Home | Automatic Round Damper. Power close and spring open. 5 to 10 in., plus 12, 14, 16, 18 and 20 in. |
| EARD | Honeywell Home | Ventilation round damper. Power open and spring close. 5 to 8 in. only. |
| ZD | Honeywell Home | Rectangular zone damper. Power close and spring open. Extruded aluminum, parallel blade, 4 in. thick, built 5/32 in. undersize. |
| MARD | Honeywell Home | Modulating round damper. Floating point, 90 second travel. Not an analog 2 to 10VDC device. |
| TZ, /U | Honeywell Home | TrueZONE designation and packaging suffix. ARD8TZ and ARD8TZ/U are the same damper. |
| RSD | EWC Controls | Round spring return damper. Ordered as size then series, for example 6 RSD. |
| ND, SID | EWC Controls | Rectangular damper and slip-in retrofit damper. |
| RDS, RDSC, RDM | Zonefirst | Round damper. S is 2 wire spring return power close. SC is spring close and power open. M is 3 wire power open and power close. |
| GVD | Field Controls | Gas vent damper. The number is the vent diameter. PL denotes a plastic base motor assembly. |
| RVGP | Effikal | Gas vent damper. Crosses to the Field Controls GVD of the same diameter. |
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Download the Cross-Reference Sheets
Same data as this page in printable form, for the truck, the counter or the estimate file.
HMI-TL-XR-01, Rev. APDF ↓ Honeywell Home (Resideo)
ARD, EARD, ZD, MARDPDF ↓ EWC Controls (Ultra-Zone)
RSD, ND, SID, URDPDF ↓ Zonefirst
RDS, RDSC, RDMPDF ↓ AprilAire
6000 seriesPDF ↓ Field Controls and Effikal
GVD and RVGP vent dampersPDF ↓ Skuttle
216 make-up air controlPDF ↓ Technical Library
Wiring diagrams, install guides, guide specsOpen →
Cross-references on this page are a guide to product selection based on damper action, voltage, size and application. They are not a statement that products are identical in construction, performance, listing or certification. Confirm the application, the control sequence, the appliance listing where applicable, and the requirements of the authority having jurisdiction before substituting any product. Custom rectangular dampers (HCR and HSI) are built to order and are non-returnable. Confirm all dimensions and action codes before ordering. Honeywell Home and TrueZONE are trademarks of Honeywell International Inc., used under license by Resideo Technologies, Inc. AprilAire is a trademark of Research Products Corporation. Ultra-Zone is a trademark of EWC Controls, LLC. Zonefirst, Effikal, Field Controls and Skuttle are trademarks of their respective owners. Belimo is a trademark of Belimo Holding AG. Hoyme Manufacturing Inc. is not affiliated with, endorsed by or sponsored by any of these companies. All part numbers are the property of their respective owners and are used here only to identify products for cross-reference purposes. Specifications are subject to change without notice. Document HMI-TL-XR-01, Revision A, September 2026. Reviewed every 12 months and after any known competitor catalogue change.
Not sure which action code you need?
Call and we will confirm the equivalent, the action, the diameter and the interlock before you order. Free to contractors, installers and wholesalers. Custom rectangular dampers are non-returnable, so it is worth the two minute call.
Over 40 years of engineering HVAC dampers, controls, and fresh-air components trusted by contractors, inspectors, and distributors across North America.
Who We Are
Hoyme Manufacturing designs and builds specialized HVAC dampers, relay adaptors, and fresh-air components for residential and light-commercial forced-air systems.
Since 1984, our focus has been simple: create components that install quickly, control air reliably, and meet evolving energy and ventilation codes. Today, Hoyme products are trusted by contractors, homebuilders, engineers, and distributors across North America.
What We Build
Hoyme specializes in:
- Motorized dampers for controlled combustion air and fresh-air ventilation.
– Non-motorized dampers for backdraft prevention and airflow control.
– ADP interface relay adaptors that simplify control wiring and integration.
– Furnace fan–generated air exchangers that deliver fresh air using existing ductwork.
Every component is engineered for clear labeling, clean wiring, and dependable airflow control in modern HVAC systems.
Who We Serve
Hoyme components are used every day by:
HVAC contractors who need repeatable installs with minimal call-backs.
Homebuilders and developers who want systems that pass inspection smoothly
Mechanical engineers and designers specifying reliable ventilation solutions.
Inspectors looking for clearly labeled, code-compliant components in the field.
HVAC wholesalers and distributors who depend on stable inventory and consistent quality.
Our Origins
Hoyme Manufacturing began with a problem in a single farmhouse. In the 1970s, founder Cliff Hoyme followed code and installed a passive fresh-air supply duct for combustion. The result was what many homeowners still experience today: an uncomfortably cold basement, wasted energy, and unnecessary strain on the heating system.
Cliff’s solution was simple but powerful — use motorized dampers to control when and how outside air enters the system. That idea grew into a full line of CSA-approved combustion-air and ventilation dampers designed to reduce energy waste, improve comfort, and support modern energy codes such as the Model National Energy Code for Houses (MNECH).
Since then, thousands of contractors, homeowners, and even code officials have installed Hoyme dampers to solve the same problem: uncontrolled cold air and inefficient combustion air.
How We Support Your Projects
Hoyme backs every product with practical support and clear documentation.
– Installation and wiring guides that are inspector-ready and easy to follow.
– Technical support for product selection, wiring questions, and code-compliance guidance.
– Reliable lead times and stocking programs for HVAC distributors.
Whether you’re designing a system, installing dampers on site, or supporting contractors as a wholesaler, our team helps keep your projects moving without delays.