Description
Product image is representative only. Actual product may differ in appearance depending on size, configuration, and options selected at order.
Hoyme's CSA-certified inline damper body with Belimo TFB24 on/off spring return actuator — factory-assembled, single SKU, ready to install. The product for projects where the mechanical engineer specifies Belimo, where damper sizes extend beyond 14", or where 24 Vac/dc supply flexibility is required. Sizes 6"–20" in even-inch increments.
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Belimo TFB24 — most specified on/off spring return actuator in commercial HVAC — factory-mounted to Hoyme damper body; no field mounting, no compatibility questions, one SKU
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24 Vac or 24 Vdc — either polarity on DC — practical advantage on BAS systems where the control output is DC rather than AC; most on/off actuators at this price point are AC only
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6"–20" even-inch sizes — covers the size range where the standard Hoyme quarter-turn drive is not rated; same spring return fail-safe behavior
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TFB24 field-replaceable — stocked through Belimo distributors; actuator replaces without disturbing the damper body or duct connections
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End switch and heat bypass (-H) available on all sizes — factory-installed; no relay on TFB24 motor code
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CSA certified to 12" — for 14"–20", confirm AHJ acceptance before ordering on code-required applications
Confirm PO vs. PC before ordering — and confirm the -H bypass is not on a fresh air application. Action is factory-set and cannot be changed after installation. The -H heat bypass is permanent and cannot be disabled — do not specify -H on fresh air intake, make-up air, or ventilation applications. The bypass will allow continuous outdoor air infiltration when the damper is commanded closed.
| If you need… | Product | Actuator |
|---|---|---|
| On/off spring return — 2-position gate, 24 Vac/dc | HAC-40 | Belimo TFB24 — this product |
| On/off spring return — 100–240 Vac line voltage | HAC-44 | Belimo TFB120 |
| Modulating 2–10 VDC proportional control | HAC-43 | Belimo TFB24-SR-T |
| 3-wire floating point DDC open/stop/close | HAC-34 | Belimo CMB24-3-T |
| UL 555S fire and smoke rated | HAC-90 | Belimo FSLF24 US |
Actuator
Belimo TFB24 — factory-mounted
Sizes
6"–20" even inches
Supply Voltage
24 Vac or 24 Vdc
Action
PO or PC
CSA Status
Certified to 12" — confirm AHJ for 14"–20"
Relay
Not available on TFB24
Need ADP furnace fan sequencing? Use the end switch variant (SPO or SPC) with an ADP relay adaptor for fresh air + furnace fan interlock. The TFB24 does not include a relay — if a relay output is needed in the control circuit, use a separate relay adaptor. For modulating control see HAC-43 (TFB24-SR-T).
2-year electrical · 10-year mechanical warranty
Hoyme damper body — Made in Canada · Belimo TFB24 field-replaceable through Belimo distributors