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COMFORTMAKER // FXM4X

Which heater kit goes in which FXM4X cabinet?

The values on this page are the ones COMFORTMAKER publishes.

All COMFORTMAKER

COMFORTMAKER // FXM4X

COMFORTMAKER electric furnace: the FXM4X fan coil and its heater kit

This fan coil’s heat is a kit you choose; the cabinet decides which ones fit.

The brand calls it the FXM4X fan coil: a cabinet that pushes air through your ductwork and holds an EHK electric heater kit, from 5 to 30 kW. Six cabinets from 2 to 5 tons, seven kits from 5 to 30 kW, four positions: the tool below sorts them out.

Page updated November 5, 2026

This page answers

Which heater kit goes in which FXM4X cabinet?

AirGreen

Sold and installed by AirGreen.

We install in Montreal, Laval, Longueuil, the South Shore and the North Shore.

01 // The tool

Kit and cabinet

Pick the cabinet, the heater kit and the installation position. The tool tells you whether the sheet approves that kit in that cabinet, then gives its output, its supply, the cabinet dimensions and the kits the position calls for.

Cabinet

Heater kit (kW at 230 V)

Position

Values printed on the sheet: kW at 230 V and at 208 V; amps, minimum ampacity and fuse at 208 V and at 230 V. No 240 V value is published. Kits are named by their printed output. Of the seven kits in the tool, the 24 and 30 kW kits ship three-phase and convert to single phase on site. Outside the tool, the sheet approves three more kits: a 9 kW kit shipped single phase (convertible to three-phase) and a 15 kW three-phase kit from the 3600 cabinet, and an 18 kW three-phase kit from the 4200. The sheet (rev. 04) prints the wire size of every kit; the tool repeats it for the 10 kW kit. For the 4800 and 6000 cabinets, the printed millimetres do not match the inches: the tool gives the inches.

Approved kits by cabinet
Cabinet5 kW8 kW10 kW15 kW20 kW24 kW30 kW
2400yesyesyesyes———
3000yesyesyesyesyes——
3600yesyesyesyesyes——
4200yesyesyesyesyes——
4800yesyesyesyesyesyesyes
6000yesyesyesyesyesyesyes

Approved

10 kW kit, 3600 cabinet

10 kW kit in the 3600 cabinet
Approvedmodels EHK10AKN, EHK10AKB
Printed output
10 kW at 230 V · 7.5 kW at 208 V
Heater amps
36.2 A at 208 V · 40.0 A at 230 V
MCA / max fuse or breaker
53.8 A / 60 A at 208 V · 58.5 A / 60 A at 230 Vsingle circuit; minimum ampacity includes the motor of the largest fan coil used with the kit
Minimum wire size
6 AWG; ground 10 AWGmaximum length 78 ft at 208 V, 80 ft at 230 V (sheet rev. 04)
Cabinet H × W × D
49-5/8 × 21-1/8 × 22-1/16 in (1,261 × 537 × 560 mm, as printed)
Filter
19-7/8 × 21-1/2 in, washable, factory supplied
Upflow position
No kit: standard position

The sheet approves the 10 kW kit in the 3600 cabinet; in the upflow position, no position kit is required.

FXM4X sheet (496 41 5402 04, July 2, 2019): heater applicability and electrical data, dimensional data, accessories.

The COMFORTMAKER shop

The COMFORTMAKER products on this page, right below

Price on quotation, after the on-site assessment.

COMFORTMAKER

02 // Did you know

Three details from COMFORTMAKER’s documents

The narrowest: the 2400

The FXM4X 2400 is the narrowest cabinet: 17-5/8 in (448 mm); the 4800 and 6000, 24-11/16 in.

FXM4X Fan Coils Product Specifications, 496 41 5402 04 (July 2, 2019), dimensional data

Three kits for downflow

In the downflow position, three kits are needed: conversion, base and gasket.

FXM4X Fan Coils Product Specifications, 496 41 5402 04 (July 2, 2019), p. 1 and accessories

An insulated cabinet

The cabinet insulation is 1 in (25 mm) thick, R-4.2.

FXM4X Fan Coils Product Specifications, 496 41 5402 04 (July 2, 2019), p. 1; 25 mm: AirGreen calculation

03 // The comparison

FXM4X3600 or FXM4X4200?

The two sizes share one cabinet; what changes fits in a few lines.

ValueFXM4X3600FXM4X4200
Nominal capacity3 ton3.5 ton
Cabinet H × W × D49-5/8 × 21-1/8 × 22-1/16 in49-5/8 × 21-1/8 × 22-1/16 in
Shipping weight157 lb157 lb
Nominal airflow1,200 CFM1,400 CFM
ECM motor1/2 hp1/2 hp
Filter19-7/8 × 21-1/2 in19-7/8 × 21-1/2 in
Suction connection3/4 in7/8 in
5 kW kit: MCA26.0 A at 208 V · 28.4 A at 230 V31.2 A at 208 V · 33.5 A at 230 V
18 kW three-phase kitNot approvedApproved

Same cabinet, same filter, same motor horsepower: the 4200 moves 200 CFM more (AirGreen calculation) and also takes the 18 kW three-phase kit. With the 5 kW kit, the sheet gives it a higher minimum ampacity.

FXM4X Fan Coils Product Specifications, 496 41 5402 04 (July 2, 2019): dimensional data, physical data, heater table

04 // Published figures

The six FXM4X cabinets

Value240030003600420048006000
Nominal capacity2 ton2.5 ton3 ton3.5 ton4 ton5 ton
H × W × D, in (as printed)49-5/8 × 17-5/8 × 22-1/1653-7/16 × 21-1/8 × 22-1/1649-5/8 × 21-1/8 × 22-1/1649-5/8 × 21-1/8 × 22-1/1653-1/16 × 24-11/16 × 22-1/1659-3/16 × 24-11/16 × 22-1/16
H × W × D, mm (as printed)1,261 × 448 × 5601,357 × 537 × 5601,261 × 537 × 5601,261 × 537 × 560measure on sitemeasure on site
Shipping weight122 lb146 lb157 lb157 lb185 lb201 lb
Nominal airflow800 CFM1,000 CFM1,200 CFM1,400 CFM1,600 CFM2,000 CFM
ECM motor1/3 hp1/2 hp1/2 hp1/2 hp3/4 hp3/4 hp
CoilslopeslopeAAAA
Filter, in16-3/8 × 21-1/219-7/8 × 21-1/219-7/8 × 21-1/219-7/8 × 21-1/223-5/16 × 21-1/223-5/16 × 21-1/2
Fan coil only: FLA / MCA / max fuse2.8 / 3.5 / 15 A4.1 / 5.1 / 15 A4.1 / 5.1 / 15 A4.1 / 5.1 / 15 A6.0 / 7.5 / 15 A6.0 / 7.5 / 15 A
Tool kits approved (kW)5, 8, 10, 155, 8, 10, 15, 205, 8, 10, 15, 205, 8, 10, 15, 205, 8, 10, 15, 20, 24, 305, 8, 10, 15, 20, 24, 30
Downflow: conversionEBAC01DFSEBAC01DFSEBAC02DFAEBAC02DFAEBAC02DFAEBAC02DFA
Downflow: baseEBAC02NCBEBAC03NCBEBAC03NCBEBAC03NCBEBAC04NCBEBAC04NCB

For the 4800 and 6000 cabinets, the printed millimetres do not match the printed inches (height of the 4800, depth of both): we give the inches; measure on site before planning the space. MCA: minimum circuit ampacity; max fuse: the largest fuse or breaker allowed (printed as MOCP or max fuse depending on the document).

FXM4X Fan Coils Product Specifications, 496 41 5402 04 (July 2, 2019): dimensional data, physical data, electrical data, heater table, accessories

05 // Good to know

Good to know before the on-site assessment

A fan coil, in the brand’s words

The sheet never says furnace: the FXM4X is a fan coil, with a coil, an ECM motor and a factory-installed thermostatic expansion valve (TXV). It leaves the factory with a “no heat” plug kit in place; the electric heat comes from the EHK kit installed on site. With a CSH6 heat pump, it becomes the indoor unit of the central system.

Position kits, by part number

Upflow and horizontal left: no kit. Horizontal right: gasket EBAC01GSK. Downflow: conversion EBAC01DFS (slope coils of the 2400 and 3000) or EBAC02DFA (A coils), base EBAC02NCB, EBAC03NCB or EBAC04NCB depending on the cabinet, and gasket EBAC01GSK.

24 and 30 kW: two cabinets only

A 24 or 30 kW kit only goes in the 4800 and 6000 cabinets. The 2400 stops at 15 kW; the 20 kW kit comes in from the 3000. Supplied three-phase, the 24 and 30 kW kits convert to single phase on site, and the sheet then prints their wiring on one circuit or on three. Throughout, the sheet gives output at 230 V and 208 V only.

06 // Warranty

Warranty published by COMFORTMAKER

  • 5-year No Hassle Replacement limited warranty.
  • 5-year parts limited warranty.
  • With timely registration, an additional 5-year parts limited warranty.
  • For owner occupied, residential applications only.
  • COMFORTMAKER does not cover labour.

The sheet refers to the warranty certificate for complete details and restrictions, including coverage for other applications.

FXM4X Fan Coils Product Specifications, 496 41 5402 04 (July 2, 2019), p. 1

AirGreen // COMFORTMAKER

What COMFORTMAKER publishes, what AirGreen does

COMFORTMAKER

What COMFORTMAKER publishes

  • The units and their spec sheetsThe values shown here are the ones the brand publishes; our calculations carry the label “AirGreen calculation”.
  • The parts warrantyAs printed in its documents, with its conditions.
AirGreen

What AirGreen does

  • Sold and installed by AirGreen.Montreal, Laval, Longueuil, the South Shore and the North Shore.
  • The on-site assessmentThe series and the size are chosen in your home.
  • One clear quotationThe unit, the install and the accessories you choose, on one document.

07 // Questions

The questions we get

What exactly is a COMFORTMAKER electric furnace?

In the brand’s documents, it is a fan coil: the FXM4X. The cabinet moves the air; the electric heat comes from the EHK kit installed in it. We keep the word “furnace” in the title because that is what people search for.

Which kit fits my cabinet?

The sheet approves the 5, 8, 10 and 15 kW kits in the 2400; it adds the 20 kW kit from the 3000, then the 24 and 30 kW kits in the 4800 and 6000. The output your home needs is measured during the on-site assessment, not read off a table.

What breaker does the kit need?

It depends on the kit and the voltage. Take the 15 kW kit on a single circuit (EHK15AKF): minimum ampacity of 76.3 A at 208 V and 83.4 A at 230 V, maximum fuse or breaker of 80 A at 208 V and 90 A at 230 V. The same kit can also be wired on two circuits. The printed minimum ampacity includes the motor of the largest fan coil used with the kit; your supply is confirmed during the on-site assessment.

Which filter goes in the FXM4X?

A washable filter is factory supplied. Its size depends on the cabinet: 16-3/8 × 21-1/2 in for the 2400, 19-7/8 × 21-1/2 in for the 3000, 3600 and 4200, 23-5/16 × 21-1/2 in for the 4800 and 6000.

Where does the condensate go?

The cabinet has two drain fittings, primary and secondary, 3/4 in, with brass inserts.

Does the FXM4X work with the CSH6 heat pump?

Yes: the CSH6 sheet publishes its tested combinations with the FXM4X24, FXM4X36, FXM4X48 and FXM4X60. The heat of each combination, with its kit, is worked out in the tool on the central heat pumps page.

What warranty does COMFORTMAKER give on the FXM4X?

The sheet publishes a 5-year No Hassle Replacement limited warranty, a 5-year parts limited warranty and an additional 5 years on parts with timely registration, for owner occupied, residential applications only. COMFORTMAKER does not cover labour.

Sources checked November 5, 2026

  • FXM4X Fan Coils Product Specifications, 496 41 5402 04, July 2, 2019: features and warranty (p. 1), dimensional data, physical and electrical data, heater tables, accessories: shareddocs.com
  • CSH6 Product Specifications, 428 41 6400 02, April 25, 2019, p. 15 (tested combinations): shareddocs.com

AirGreen calculations (kW conversions, sums, percentage shares) are made on the published values and labelled as such.

AirGreen // Air conditioning and heating

The cabinet and the kit are chosen on site

We look at the space for the cabinet, the ductwork and the panel, then propose the cabinet and the heater kit.

Book my free estimate514-316-2973
RBQ 5645-9605-01Subclasses 15.8, 15.10 and 16. Gas and oil work is entrusted to a licensed partner.
Free estimateAt your home, no obligation.
Showroom1370 Joliot-Curie Street, Suite 712, Boucherville.

Page updated November 5, 2026