CSA Certified · 120 Vac · Built-In Transformer
HAC-12
Inline Fresh Air
Damper — 120 Vac
Built-In Transformer · No Low-Voltage Circuit Required · CSA Certified · 4"–9"
- Same HAC spring return performance — runs directly on 120 Vac
- Built-in transformer steps 120 Vac to 24 Vac internally — no separate transformer needed
- PO or PC spring return — same fail-safe operation as standard HAC
- End switch available — relay not available on motor code 12
- CSA certified for Canadian and US installations
- Sizes 4"–9" — 2" and 3" available in 24 Vac HAC only
- 2-year electrical / 10-year mechanical warranty
Is this the right product?
✔ Right product if
You need a CSA-certified motorized inline fresh air damper in sizes 4"–9" and only 120 Vac is available at the damper location — no low-voltage control circuit.
✗ Not this product if
24 Vac available → use standard HAC — simpler, full ADP relay adaptor compatibility, 2"–9".
Need heat bypass at 120 Vac → HAC-12H
Need insulated body at 120 Vac → HAC-12L
Need 2" or 3" → standard HAC (24 Vac) only
Need heat bypass at 120 Vac → HAC-12H
Need insulated body at 120 Vac → HAC-12L
Need 2" or 3" → standard HAC (24 Vac) only
What It Does
Same HAC performance at 120 Vac. No separate transformer. No low-voltage circuit required.
The HAC-12 is the 120 Vac version of the standard HAC inline fresh air damper. A built-in transformer steps 120 Vac down to 24 Vac internally — you run a single 120 Vac switched circuit to the damper and it handles the voltage conversion. No separate transformer to mount, no secondary low-voltage wiring run, no additional panel space required. Same open/close control, same spring return fail-safe, same PO/PC configuration as the standard HAC.
Do not supply 24 Vac to a HAC-12. The built-in transformer requires 120 Vac input. Supplying 24 Vac will result in product damage and will not operate the damper. Before wiring, verify the supply voltage matches the product — 120 Vac for the HAC-12, 24 Vac for the standard HAC.
HAC vs. HAC-12 — Which to Order
The decision is determined entirely by what voltage is available at the damper location.
| Choose standard HAC (24 Vac) when… | Choose HAC-12 (120 Vac) when… |
|---|---|
| 24 Vac control circuit is already at the damper location | Only 120 Vac is available at the damper location |
| Thermostat or ventilation controller outputs 24 Vac | Damper is controlled from a 120 Vac switch or timer |
| ADP relay adaptor required for furnace fan sequencing | Simple on/off control from a switched 120 Vac circuit |
| New construction with low-voltage control infrastructure | Retrofit where running low-voltage wire is impractical or costly |
| Sizes 2" or 3" required | Sizes 4"–9" and 120 Vac is the available supply |
How the built-in transformer works: The HAC-12 uses a Hansen motor with a 24 Vac spring return mechanism — the same spring return operation as the standard HAC. The built-in transformer takes 120 Vac from the supply circuit and steps it down to 24 Vac to power the motor internally. The transformer is integrated into the motor assembly and is not field-replaceable independently of the motor. If the transformer fails, the motor kit is the service part.
Complete 120 Vac HAC Family
Three variants cover all 120 Vac HAC applications — match your job conditions to the right product.
| Job Condition | Right Product | Link |
|---|---|---|
| 120 Vac + fresh air / make-up air, conditioned damper location | HAC-12 — this product | — |
| 120 Vac + hot air duct zone control (heat bypass needed) | HAC-12H — 120 Vac, 10% bypass | View |
| 120 Vac + cold climate / unconditioned damper location | HAC-12L — 120 Vac, factory-insulated body | View |
| 24 Vac + cold climate | HAC-L — 24 Vac, factory-insulated body | View |
| 24 Vac + fresh air / make-up air, conditioned location | HAC — standard 24 Vac, full option set | View |
Configuration Guide
Select size, action, and end switch. No relay option on HAC-12. PO/PC cannot be changed after installation.
| Variant Code | Action | End Switch | Part Number Example (6") |
|---|---|---|---|
| OPO | Power Open | No end switch | HAC-0612-OPO |
| SPO | Power Open | End switch included | HAC-0612-SPO |
| OPC | Power Close | No end switch | HAC-0612-OPC |
| SPC | Power Close | End switch included | HAC-0612-SPC |
No relay option on HAC-12. The 12 motor code does not include relay capability. If a relay output is required, use the standard 24 Vac HAC with the relay option (11 motor code) and the appropriate ADP relay adaptor. If the site only has 120 Vac and furnace fan sequencing is required, discuss the wiring approach with your controls supplier — a line-voltage relay in the control circuit may bridge the two.
PO vs. PC — Which Action for Your Application
| Action | When Powered | Fail-Safe on Power Loss | Typical Application |
|---|---|---|---|
| PO — Power Open | Damper opens | Spring-closes — duct seals | Fresh air intake, make-up air — standard |
| PC — Power Close | Damper closes | Spring-opens — duct stays open | Applications requiring fail-open on power loss |
Cannot be changed after installation. PO and PC are not interchangeable. Confirm action before ordering.
Part Number Decoder
HAC-0612-SPO
HAC
Product family: universal inline air control damper
06
Size (2-digit): 04=4", 05=5", 06=6", 07=7", 08=8", 09=9"
12
Motor code: 120 Vac, Hansen motor with built-in 24 Vac transformer and spring return
O / S
End switch: O = no end switch | S = end switch included
PO / PC
Action: PO = Power Open (spring-close fail-safe) | PC = Power Close (spring-open fail-safe)
No suffix
Standard HAC-12 — no heat bypass, no insulation. See HAC-12H or HAC-12L for those options.
Key Specs
Sizes
4", 5", 6", 7", 8", 9"
Supply Voltage
120 Vac — built-in transformer
Motor Voltage
24 Vac internal (Hansen motor)
Action
PO or PC — specify at order
End Switch
Optional (S prefix)
Relay
Not available on motor code 12
Certification
CSA certified — Canadian & US
Warranty
2-yr electrical / 10-yr mechanical
Common Questions from the Counter
Answers to what comes up most when specifying the HAC-12.
What happens if I accidentally wire 24 Vac to a HAC-12?
The built-in transformer is designed for 120 Vac input. Applying 24 Vac will not operate the damper and may damage the transformer. Before wiring, verify the supply voltage matches the product — 120 Vac for the HAC-12, 24 Vac for the standard HAC. If 24 Vac is available at the location, the standard HAC is the correct product.
Can I use the HAC-12 with an ADP relay adaptor for furnace fan sequencing?
The ADP relay adaptor series is designed for 24 Vac control circuits. The HAC-12's 120 Vac supply circuit is not directly compatible with the ADP output. For applications requiring furnace fan sequencing with a fresh air damper interlock, use the standard 24 Vac HAC with the ADP-0241-S5A. If the site only has 120 Vac and furnace fan sequencing is required, discuss the wiring approach with your controls supplier.
Is the relay available on the HAC-12?
No — the HAC-12 motor code (12) does not include relay capability. This applies equally to HAC-12, HAC-12H, and HAC-12L. If a relay output is required, use the standard 24 Vac HAC with the relay option (11 motor code) and the appropriate ADP relay adaptor.
Is the HAC-12 available in 2" or 3"?
No — the HAC-12 is available in 4" through 9" only. The 2" and 3" sizes are available in the standard 24 Vac HAC only.
Can the HAC-12 be controlled from a standard residential thermostat?
Only if the thermostat has a 120 Vac switched output — which most residential thermostats do not. Standard residential thermostats output 24 Vac. If your thermostat outputs 24 Vac, use the standard HAC. The HAC-12 is the correct choice when the damper is being controlled from a 120 Vac manual switch, timer, or line-voltage relay.
Ready to Order
HAC-12 — Inline Fresh Air Damper 120 Vac
Select your size, action (PO/PC), and end switch option — then add to cart. Confirm 120 Vac is available at the damper location before ordering.
Configure & Order →
Size · Action · End Switch
Need help specifying the HAC-12?
Technical support available through your Hoyme wholesaler or direct.