Discontinued — nVent no longer sells it at any price

Your T501226G156 has an adapter-fit replacement.

Same capacity, same voltage. The included adapter plate bridges your existing cutout to the AT12RNS10 — fitting work during the swap, not a new cutout.

Also sold as McLean · Hoffman · Pentair · nVent — T501226G156 — 12,300 BTU/hr · 230V · NEMA 4X · R-134A

Yours

T501226G156

50.0″ × 19.0″ × 11.1″ · 164 lbs

Adapter fit

Ours, in production

VoltAire AT12RNS10

43.99″ H × 12.30″ D × 16.39″ W · 96.9 lbs · 41% lighter

Adapter Fit · +$405 Fit details ↓

You'll order: 1× AT12RNS10 + 1× adapter plate — $6,897 total.

Verified fit path — so you're not the one explaining a wrong-fit order.

No price comparison to make — nVent no longer sells this unit at any price. The real cost to weigh is a planned swap now versus an emergency swap after it quits.

Your In-Production Replacement

AT12RNS10

Adapter Fit

12,000 BTU/hr • 230V • NEMA 4X

Availability Built to Order 4-6 weeks — made in Orlando, FL

Includes Unit + adapter plate 30-day price lock · no-obligation quote

Built Orlando, FL — UL/cUL Listed

Need It Faster?

The AT12RNW10 is on the shelf right now — same 12,000 BTU/hr, same 230V, in the standard off-white cabinet. It ships next business day instead of 4-6 weeks — and it costs $1,821 less.

Take the in-stock AT12RNW10 $5,076

Your order total

$6,897

Adapter plate included in this price.

Start My Order

Backed by VoltAire’s 12-month warranty (PDF) · UL 484 · Made in Orlando, FL 🇺🇸

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T501226G156

Existing Unit Discontinued

T501226G156

12,300 BTU/hr (3516 Watt) • 230V

Brand nVent

Series T5012

Capacity 12,300 BTU/hr (3516 Watt)

Voltage 230V

Heat Yes

Finish S

Where distributors publish pricing for the OEM equivalent, VoltAire runs 48% less on average (21-70% by model).

VoltAire Replacement In Production

AT12RNS10

12,000 BTU/hr • 230V

Brand VoltAire

Series AT Telecom Series

Capacity 12,000 BTU/hr capacity step-down, about −2%

Voltage 230V

Heat Yes

Finish 304 Stainless Steel (NEMA 4X)

What You'll Order

1× AT12RNS10 $6,492

1× Adapter / Transition Plate $405

Order total $6,897

Popular options

Heater Cabinet Controller

Condenser intake filter (15×15 Mesh Filter) +$202

Screens sawdust, filings & insects off the condenser coil — not an enclosure air filter; cabinet air stays sealed.

Need a different voltage or capacity? Configure your AT08 / AT10 / AT12 →

Built to Order • 4-6 weeks

Details

Fit Details

Adapter Fit

Same cooling capacity and voltage as the T501226G156. Cabinet cutout dimensions differ, so an adapter plate is required to bridge the mounting pattern between the existing opening and the VoltAire AT12RNS10 — so you're not fabricating a new opening. Plan on some fitting work during the swap; we'll spec the exact adapter for your installation at order review.

Unit dimensions — what the tape measure will tell you

	T501226G156	AT12RNS10	Δ
Height	50.0″	43.99″ H	-6.0″
Width	19.0″	16.39″ W	-2.6″
Depth	11.1″	12.30″ D	+1.2″

Existing nVent unit VoltAire replacement

T5012 to AT12 Adapter plate + provisional cabinet cuts

Plan on the adapter plate plus some cabinet cutting — the red areas show where the new openings reach beyond the existing cutout. The red areas come from the manufacturer's spec sheet and must be confirmed against your actual unit before cutting.

Existing nVent AC outline Existing nVent opening Adapter plate New VoltAire unit outline Stamped VoltAire opening Existing cabinet metal that may need removal — verify first

The red hatching shows cabinet metal outside the existing openings; verify it against your actual unit before cutting.

Step 1 of 4 Start with the existing T5012 cabinet pattern.

The green adapter plate covers the existing pattern and contains the VoltAire stamped openings; use the supplied plate for final dimensions, holes, gaskets, and cut locations. The two manufacturer drawings are centered on each other for visual comparison only, because a shared mounting reference between the two units has not been verified. Verify every opening against your actual unit before any cutting or mounting. This comparison uses the standard AC AT12 footprint; the 48 VDC AT12RB has different dimensions. This comparison is a visual guide, not a cutting or drilling template. Openings can vary with voltage and production run — verify against your actual unit before any cutting or mounting, and follow the manufacturer's installation template.

Not sure? Talk to a fit specialist — (844) 925-5668.

T501226G156 Replacement — Common Questions

What replaces the McLean T501226G156?

The VoltAire AT12RNS10 — 12,000 BTU/hr at 230V, NEMA 4X, UL/cUL Listed and built in Orlando, FL. Adapter fit — mounts to your existing cutout with the included adapter plate.

Is the T501226G156 discontinued?

Yes. nVent has discontinued the T501226G156 and no longer sells it at any price. The VoltAire AT12RNS10 is an in-production replacement at the same voltage and in the same capacity class, backed by a 12-month warranty.

Will the VoltAire AT12RNS10 fit my T501226G156 cutout?

Yes, with the adapter plate included in the quoted total. It bridges your existing T501226G156 cutout to the AT12RNS10 mounting pattern so you're not fabricating a new opening — but plan on some fitting work during the swap. The dimensions table on this page compares both units side by side; if anything looks off for your cabinet, call (844) 925-5668 before you order.

How much does a T501226G156 replacement cost?

The VoltAire AT12RNS10 is $6,897 including the adapter plate. nVent no longer sells the T501226G156 at any price, so there is no OEM price to compare. Volume discounts start at 4 units, and every quote locks pricing for 30 days with no obligation.

How fast can I get a replacement for my T501226G156?

Configured builds ship in 4–6 weeks from Orlando, FL. In-stock variants are sometimes on the shelf — call (844) 925-5668 and we'll find the fastest path for your spec.

Is the VoltAire AT12RNS10 an original McLean part?

No. VoltAire is an independent brand — an engineered replacement, not an OEM part. VoltAire Cooling is not affiliated with McLean, Hoffman, Pentair, or nVent. Units are UL/cUL Listed (UL 484) and manufactured in Orlando, Florida.

Why Switch to VoltAire?

Engineered Replacement

Matched voltage and NEMA 4 protection, with the capacity difference stated in plain numbers above — with a clear fit path for your enclosure: direct, adapter plate, or template-guided modification. Built to replace McLean, Hoffman, Pentair, and nVent.

Built & Tested in the USA

Manufactured in Orlando, FL with a 5-point pressure and leak test. In-stock models ship fast from East Coast (VA) and Rocky Mountain (ID) warehouses; built-to-order configurations ship in 4-6 weeks.

48% Below Published Online Pricing, on Average

No distribution markup. Transparent pricing. Volume discounts at 4+ and 7+ units. Integrator pricing available for panel shops.

Need Heat, Stainless, 230V, or Remote Monitoring?

The AT08 is available with electric heat, stainless steel NEMA 4X, 48VDC, and factory ethernet controllers with Lead-Lag, SNMP, and BACnet.

Configure Your AT08 / AT10 / AT12 →

Related Models

T501226G156 (this page) T501226G100 T501226G150 T501226G125

VoltAire Cooling is an independent party and is not affiliated with or endorsed by McLean, Hoffman, Pentair, or nVent. All competitor brand names and model numbers are the property of their respective owners and are used here for identification and compatibility purposes only.