Line Voltage · On/Off Spring Return
HAC-44
HAC-44
Belimo TFB120
Inline Damper
100–240 Vac · Spring Return · 6"–20" · No Transformer Required
✓
Runs directly on 100–240 Vac — no step-down transformer needed
✓
Same Hoyme inline damper body as HAC-40
✓
On/off spring return — Power Open or Power Close
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Heat bypass (−H) available on all sizes for zone control
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End switch available on all sizes
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No relay on TFB120 — end switch only
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Factory-mounted Belimo TFB120 — ships ready to install
Is this the right product?
✔ Right product if
You need on/off spring return inline damper control in 6"–20" and only line voltage (100–240 Vac) is available at the damper — no 24 Vac low-voltage circuit.
✗ Not this product if
24 Vac available → use HAC-40 (TFB24) — CSA certified to 12", accepts 24 Vdc.
Modulating 2–10 VDC → HAC-43
Floating point, line voltage → HAC-35
Fire & smoke at 120 Vac → HAC-80
Modulating 2–10 VDC → HAC-43
Floating point, line voltage → HAC-35
Fire & smoke at 120 Vac → HAC-80
What It Does
On/off spring return inline damper control at line voltage — no transformer, no low-voltage circuit required.
The HAC-44 is the line-voltage companion to the HAC-40 (TFB24). Same Hoyme inline damper body. Same on/off spring return behavior. Same PO/PC configuration options. Same 6"–20" size range. The single difference: the Belimo TFB120 actuator accepts 100–240 Vac directly, eliminating the need for a step-down transformer or a separate low-voltage control circuit.
Where line voltage is what's already at the damper location — commercial RTU fresh air intakes controlled from line-voltage RTU panels, industrial make-up air controlled by line-voltage contactors, retrofit installations where adding 24 Vac infrastructure is impractical — run the switched line-voltage circuit directly to the actuator. No transformer. No extra wiring run.
CSA Certification — Confirm Before Ordering: Unlike the HAC-40 (TFB24) which is confirmed CSA certified to 12", certification status for the HAC-44 (TFB120) requires confirmation with Hoyme Manufacturing before ordering on code-required applications. If AHJ sign-off is required and the HAC-44 cannot be confirmed, use the HAC-40 with a step-down transformer in the control circuit.
TFB120 vs. TFB24 — Voltage Is the Only Meaningful Difference
Use the voltage that's already at the damper location. The choice is a site condition, not a product upgrade decision.
| Spec | HAC-40 (Belimo TFB24) | HAC-44 (Belimo TFB120) — this product |
|---|---|---|
| Supply Voltage | 24 Vac or 24 Vdc | 100–240 Vac (line voltage) |
| Control Type | On/Off spring return | On/Off spring return |
| Fail-Safe | Spring return on power loss | Spring return on power loss |
| PO / PC | Both available | Both available |
| End Switch | Optional | Optional |
| Relay Option | Available | Not available on TFB120 |
| Heat Bypass (−H) | Available | Available |
| CSA Status | Certified to 12" | Confirm with Hoyme before ordering |
| Sizes | 6"–20" | 6"–20" |
| Use When | 24 Vac/dc control available | Line voltage only at damper location |
Belimo Series — Control Type Selector
All Belimo-actuated HAC variants on a single Hoyme inline damper body. Select by control type and voltage.
| Model | Actuator | Control Type | Voltage | Spring Return | Link |
|---|---|---|---|---|---|
| HAC-40 | TFB24 | On/Off | 24 Vac/dc | Yes | View |
| HAC-44 ← You are here | TFB120 | On/Off | 100–240 Vac | Yes | — |
| HAC-43 | TFB24-SR-T | Modulating 2–10 VDC | 24 Vac/dc | Yes | View |
| HAC-60 | LMB24-SR-T | Modulating 2–10 VDC | 24 Vac/dc | No — holds last | View |
| HAC-34 | CMB24-3-T | Floating point 3-wire | 24 Vac/dc | No — holds last | View |
| HAC-30 | LMB24-3-T | Floating point 3-wire | 24 Vac/dc | No — holds last | View |
| HAC-35 | CMB120-3 | Floating point 3-wire | 100–230 Vac | No — holds last | View |
| HAC-70 | LMX120-3 | Floating point 3-wire | 100–230 Vac | No — holds last | View |
| HAC-90 | FSLF24 US | Fire & Smoke (UL 555S) | 24 Vac | Yes | View |
| HAC-80 | FSLF120 US | Fire & Smoke (UL 555S) | 120 Vac | Yes | View |
Configuration Guide
Select size, action, end switch, and heat bypass. PO/PC cannot be changed after installation — confirm before ordering.
| Variant Code | Action | Heat Bypass | End Switch | Part Number Example (10") |
|---|---|---|---|---|
| OPO | Power Open | No bypass | No | HAC-1044-OPO |
| OPO-H | Power Open | 10% bypass | No | HAC-1044-OPO-H |
| SPO | Power Open | No bypass | Yes | HAC-1044-SPO |
| SPO-H | Power Open | 10% bypass | Yes | HAC-1044-SPO-H |
| OPC | Power Close | No bypass | No | HAC-1044-OPC |
| OPC-H | Power Close | 10% bypass | No | HAC-1044-OPC-H |
| SPC | Power Close | No bypass | Yes | HAC-1044-SPC |
| SPC-H | Power Close | 10% bypass | Yes | HAC-1044-SPC-H |
PO vs. PC — Which Action for Your Application
| Action | When Signal Applied | 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-1644-SPO-H
HAC
Product family: universal inline air control damper
16
Size (2-digit): 06=6", 08=8", 10=10", 12=12", 14=14", 16=16", 18=18", 20=20"
44
Motor code: Belimo TFB120, on/off spring return, 100–240 Vac
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)
-H
Optional: 10% heat bypass machined into blade. Hot air zone control only.
Key Specs
Sizes
6", 8", 10", 12", 14", 16", 18", 20"
Actuator
Belimo TFB120
Supply Voltage
100–240 Vac
Control Type
On/Off spring return
Action
PO or PC — specify at order
End Switch
Optional (S prefix)
Relay
Not available on TFB120
Heat Bypass
Optional (−H suffix)
CSA Status
Confirm with Hoyme
Warranty
2-yr electrical / 10-yr mechanical
Common Questions from the Counter
Answers to what comes up most when specifying the HAC-44.
If both HAC-40 and HAC-44 do the same thing, when should I specifically choose the TFB120?
Choose the TFB120 (HAC-44) when only line voltage is available at the damper location and adding a step-down transformer or running low-voltage wiring is impractical or cost-prohibitive. Choose the TFB24 (HAC-40) when 24 Vac is already available — it has confirmed CSA certification to 12", accepts 24 Vdc, and the low-voltage wiring infrastructure is typically already in place. The TFB120 is the solution to a specific site condition, not a general upgrade.
Does the TFB120 work on both 120 Vac and 240 Vac systems?
Yes — the TFB120 accepts 100–240 Vac across that full range. It works on North American 120 Vac systems, 208/240 Vac systems, and international systems within that voltage range. Confirm the specific supply voltage is within the 100–240 Vac operating range before ordering.
What's the CSA certification status on the HAC-44?
Unlike the HAC-40 (TFB24) which is confirmed CSA certified to 12", certification status for the HAC-44 (TFB120) requires confirmation with Hoyme Manufacturing before ordering on code-required applications. If certification is required and the HAC-44 cannot be confirmed, use the HAC-40 with a step-down transformer in the control circuit.
Is the heat bypass available on the HAC-44?
Yes — the −H heat bypass is available on all HAC-44 sizes. The bypass is machined into the blade at the factory — permanent, not field-adjustable. Specify −H only on hot air supply duct zone control applications where full shutoff causes heat buildup on a single-speed furnace. Do not specify −H on fresh air intake, make-up air, or ventilation applications — the bypass allows continuous outdoor air infiltration when the damper is commanded closed.
Can I change PO to PC after the damper is installed?
No — PO and PC are not interchangeable and cannot be changed after installation. Confirm the required action before ordering. PO (Power Open) is standard for fresh air intake and make-up air — the damper opens on signal and spring-closes on power loss to seal the duct. PC (Power Close) is for applications requiring fail-open on power loss.
Can I replace the TFB120 actuator in the field if it fails?
Yes — the Belimo TFB120 is field-replaceable and available through Belimo distributors. The actuator mounts to the HAC damper body and can be replaced without disturbing the damper body or duct connections.
Ready to Order
HAC-44 — Belimo TFB120 Inline Damper
Select your size, action (PO/PC), and end switch option — then add to cart. Confirm CSA status with Hoyme for code-required applications.
Configure & Order →
Size · Action · End Switch
Need help specifying the HAC-44?
Technical support available through your Hoyme wholesaler or direct.