Why not just add a short straight section and use a standard HAC instead?

If you can — do. The standard HAC is the preferred product: the actuator is on the inline body with clear access, servicing is straightforward, and the damper can be repositioned or replaced without touching the duct elbow. The HAC-E is for when adding that straight section is not practical — the space is not there, the existing ductwork cannot be reconfigured without major work, or the elbow is the only location where the control point can go. If the inline HAC fits, use it.

Is the relay available on the HAC-E?

No — the HAC-E uses the 10 motor code on all sizes, which means no relay is included. If a relay output is required in addition to damper control at an elbow location, a relay adaptor in the control circuit may be an alternative approach depending on the specific sequencing requirement.

What is the proving end switch — is it different from a standard end switch?

The end switch on the HAC-E is described as a proving end switch to emphasize what it actually does: it proves — confirms beyond a motor run signal — that the damper blade has physically reached the commanded position. It is the same physical component as the end switch on the standard HAC, HAC-F, and HOM, used for the same purpose: giving a controller or relay adaptor confirmed position feedback rather than an inferred position from the motor being energized.

What sizes does the HAC-E come in?

The HAC-E is available in 5 inch through 9 inch. It is not available in 4 inch or smaller. For 4 inch applications requiring elbow control, contact Hoyme to discuss options.

What happens if the actuator is blocked or inaccessible after installation?

The actuator motor is the component most likely to require service over the product lifetime. If the actuator is inaccessible after installation, a motor failure means opening up the space to reach it. Plan actuator access at rough-in, not after the space is closed. If access cannot be guaranteed, reconsider whether a duct layout change to accommodate an inline HAC is worth the upfront effort.

Hoyme HAC-E motorized elbow damper for tight spaces, 24 Vac

Hoyme HAC-E motorized elbow damper for tight spaces, 24 Vac, view 2

Hoyme HAC-E motorized elbow damper for tight spaces, 24 Vac, view 3

Hoyme HAC-E motorized elbow damper for tight spaces, 24 Vac, view 4

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HAC-E Motorized Elbow Damper, 24 Vac, 5"–9", Control Built Into the Elbow

Hoyme ManufacturingSKU: HAC-0510-OPO-E

Duct Diameter: 5"

Power Operation: Power Open (PO)

Configuration: Standard (No End Switch)

Variant

Price:

$193.00 CAD

Quantity:

Contractor? Order through your HVAC wholesaler for your account pricing. Find a wholesaler

No wholesaler account? Buy direct here at list price. Ships across Canada and the US. How to buy

Not sure it's the right part? Call 1-800-661-7382 for free technical support.

Questions before you order? Free technical support at 1-800-661-7382, or see wiring diagrams and install guides.

Contractor? Buy through a Hoyme wholesaler. Custom size or volume order? Request a quote.

Motorized elbow damper for round duct fresh air and ventilation control where space constraints prevent installing a standard inline damper in the straight duct run. The damper blade is integrated directly into the elbow fitting: 2-position open/close control at the direction change, no straight duct sections required. Same stall-protected Hoyme 24 Vac spring return drive as the standard HAC. Sizes 5"–9".

Specify the HAC-E only when the elbow is your only option. The standard HAC is always the preferred product when straight duct space is available: the actuator has clear service access and servicing is straightforward. On the HAC-E, the actuator is mounted on the elbow body itself and must be accessible after installation. Plan actuator clearance and service access at rough-in, before the space is closed up.

✓ Control built into the elbow: no straight duct required upstream or downstream; designed for tight mechanical rooms and constrained duct layouts

✓ Same stall-protected Hoyme spring motor drive: nylon bearings, 24 Vac, identical to the standard HAC drive

✓ PO or PC action: confirm before ordering; the action can be converted in the field using the Hoyme conversion procedure

✓ Proving end switch available: confirms the blade has physically reached position; required for proving ADP adaptors (TPX models) and gas dryer RADPs

✓ No relay option: motor code 10 on all sizes; if a relay output is needed at the elbow location, a relay adaptor in the control circuit is the alternative

Use HAC-E when…

✓No straight duct available at the control point: elbow is the only option

✓Tight mechanical room: adding straight sections before/after a HAC isn't practical

✓Retrofit where existing duct layout only permits control at an elbow

✓HRV/ERV fresh air connection where the elbow is the only viable control point

Use standard HAC when…

→Straight duct space is available, always the preferred install

→Service access needs to be straightforward: actuator on inline body, clear approach

→4" diameter needed: HAC-E starts at 5"

→Relay output required: relay not available on HAC-E

Configuration

Motorized elbow: blade in fitting

Sizes

5"–9"

Voltage

24 Vac

Action

PO or PC

End Switch

Proving: optional (S prefix)

Relay

Not available on HAC-E

Interlocking with the furnace fan? Use the ADP-0241-05A (24 Vac ventilation switch) or ADP-1101-05A (120 Vac exhaust fan switch) with an OPO or OPC variant; both open the damper and start the furnace fan together. Where an exhaust fan must wait until the damper proves open, use a TPX proving adaptor with the SPO or SPC variant. See the ADP series for the correct model for your application.

2-year electrical · 10-year mechanical warranty

Made in Canada · Same Hoyme spring motor drive as the standard HAC

Product image is representative only. Actual product may differ in appearance depending on size, configuration, and options selected at order.

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HAC-E Motorized Elbow Damper, 24 Vac, 5"–9", Control Built Into the Elbow

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HAC-E Motorized Elbow Damper, 24 Vac, 5"–9", Control Built Into the Elbow

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