Product image is representative only. Actual product may differ in appearance depending on size, configuration, and options selected at order.
Hoyme inline damper body with Belimo CMB120-3 line-voltage floating point actuator. Same 3-wire Open / Stop / Close control architecture as the HAC-34 (CMB24-3-T). Same holds-last-position behavior on power loss. One difference: the CMB120-3 accepts 100–230 Vac directly — no step-down transformer, no low-voltage circuit required at the damper location. Sizes 6"–20" in even-inch increments.
⚠ No Spring Return — Holds Last Position on Power Loss
On power loss, the HAC-35 blade stays at its last position — it does not move to a defined open or closed fail-safe position. If your application requires the damper to move to a defined position on power loss, use a spring return product: HAC-44 (TFB120) for line-voltage on/off with spring return.
✓CMB120-3 — 100–230 Vac direct — accepts North American 120 Vac, 208/240 Vac, and international line voltage; no transformer, no low-voltage run to the damper
✓Same 3-wire floating point as HAC-34 — Open / Stop / Close; DDC controller pulses the Open or Close wire to position the blade incrementally; blade holds when neither is active
✓Higher torque class — same as CMB24-3-T — suited to the same size range as the HAC-34; not the lighter LMB torque class
✓Belimo CMB120-3 — factory-mounted to Hoyme damper body — single SKU, ready to install; actuator field-replaceable through Belimo distributors
✓End switch and heat bypass (-H) available on all sizes — factory-installed; no relay on CMB120-3 motor code
HAC-35 (CMB120-3) — this product
✓Only line voltage (100–230 Vac) available at the damper location
✓DDC floating point output card operates at line voltage
✓Adding a step-down transformer to the damper location is impractical
✓Spec names CMB120-3 specifically
HAC-34 (CMB24-3-T) — use instead when…
→24 Vac is already available at the damper location
→DDC floating point output card operates at 24 Vac/dc
→Simpler wiring — low-voltage circuit avoids running line voltage to the actuator
→Spec names CMB24-3-T specifically
Do not specify -H heat bypass on fresh air intake, make-up air, or ventilation applications. The 10% bypass allows continuous outdoor air infiltration when the damper is at minimum position. Specify -H only for hot air supply duct zone control on single-speed furnace systems.
Actuator
Voltage
Torque
Product
LMB24-3-T
24 Vac/dc
Lower
HAC-30
CMB24-3-T
24 Vac/dc
Higher
HAC-34
CMB120-3
100–230 Vac
Higher
HAC-35 — this product
LMX120-3
100–230 Vac (PO only)
Lower
HAC-70
Actuator
Belimo CMB120-3 — 100–230 Vac
Fail-Safe
Holds last position — no spring return
Control
3-wire floating point
Sizes
6"–20" even inches
Heat Bypass (-H)
Available all sizes — hot air zone only
CSA Status
Confirm with Hoyme before ordering
Need spring return fail-safe at line voltage? The HAC-35 holds last position on power loss. For line-voltage on/off with spring return see HAC-44 (TFB120). For 24 Vac floating point see HAC-34 (CMB24-3-T) or HAC-30 (LMB24-3-T). For line-voltage floating point with lighter torque see HAC-70 (LMX120-3).
2-year electrical · 10-year mechanical warranty
Hoyme damper body — Made in Canada · Belimo CMB120-3 field-replaceable through Belimo distributors
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Hoyme Product Selector
HOYME
Manufacturing Inc.
Made in Canada. Camrose, Alberta. Serving HVAC contractors across Canada since 1983.