This product has been discontinued. Please contact us for assistance at if needed.



Item Number: 40392

Airflow up to 57 cfm @ 0.4" PS serves 1 to 3 bedroom homes

Top port design fits in tight spaces

Three speed ventilation control

Compatible with Fantech's low-voltage controls


As Fantech's most compact, full-featured HRV, the VHR 704 unit brings a continuous supply of fresh air into a home while exhausting an equal amount of contaminated air. During winter, fresh incoming air is tempered by the heat that is transferred from the outgoing air so you save on energy costs, while during summer, the incoming air is pre-cooled if the house is equipped with an air cooling system. The VHR 704 is equipped with automatic defrost mechanisms so you can use your HRV all year long.

Defrost Cycle

A preset defrost sequence is activated at an outdoor air temperature of 23°F and lower. During the defrost sequence, the supply blower shuts down & the exhaust blower switches to high speed to maximize the effectiveness of the defrost strategy. The unit then returns to normal operation, and continues the cycle.

Technical parameters

Voltage (nominal) 120 V
Frequency 60 Hz
Phase(s) 1~
Input power 48 W
Input current 0.4 A
Air flow 27 L/s
Static pressure 100 Pa
Certificate CSA, HVI
Exchanger type Heat recovery (aluminium)
Dimensions and weights
Weight 35 lb
Used for
Installation placement Vertical
Heating Supply temperature Net airflow Consumed power Sensible recovery efficiency Apparent sensible effectiveness Latente recovery / moisture transfer

°F (°C)

cfm (L/s)





32 (0)

42 (20)





32 (0)

64 (30)





-13 (-25)

46 (22)





A B C D E Duct Size

21 1/2 (546)

10 3/16 (259)

15 2/3 (398)

17 1/4 (438)

21 1/2 (546)

4 (100)

Dimensional information is in inches (mm).


Two (2) factory-balanced fans with backward curved blades. Motors come with permanently lubricated, sealed ball-bearings to guarantee long life and maintenance-free operation.

Heat Recovery Core

Aluminum heat recovery core covered by a limited lifetime warranty. Core dimensions are 8.5” x 8.5” (216 x 216 mm) with a 8” (203 mm) depth. Our heat exchangers are designed and manufactured to withstand extreme temperature variations.

Frost Control

A preset frost control sequence is activated at an outdoor air temperature of 23°F (-5°C) and lower. During the defrost sequence, the supply blower shuts down & the exhaust blower switches into high speed to maximize the effectiveness of the defrost strategy. The unit then returns to normal operation, and continues cycle.


Core, filters, fans, drain pan and electrical panel can be accessed easily from the access panel. Core conveniently slides out with only 10” (250 mm) clearance.

Duct Connections

4" (100mm) steel duct connections with rubber gasket for easy sealing.


24 gauge galvanized steel. Baked power-coated paint for a superior adhesion and resistance.


Cabinet is fully insulated with 1” (25 mm) high density expanded polystyrene.


Two (2) washable electrostatic panel type air filters 8.5” (216mm) x 8” (205 mm) x 0.125” (3mm).


External three (3) position (Reduced/Stand By/Normal) rocker switch that will offer continuous ventilation. Fantech offers a variety of external controls. (see accessories)


External three (3) position (Low/Stand By/Medium) rocker switch that will offer continuous ventilation. The product comes with ECO-Touch wall control panel.


Limited lifetime on aluminum core, 7 year on motors, and 5 year on parts.

Requirements and standards

Complies with the UL 1812 requirements regulating the construction and installation of Heat Recovery Ventilators

Complies with the CSA C22.2 no. 113 Standard applicable to ventilators

Complies with the CSA F326 requirements regulating the installation of Heat Recovery Ventilators

Technical data was obtained from published results of test relating to CSA C439 Standards

HVI certified

COM4P Supply and Exhaust Hoods - Fantech Item Number: 40369 COM4P Supply and Exhaust Hoods

COM4P Hottes en plastique

ECO-TOUCH Pgrm Wall Ctrl - Fantech Item Number: 44929 ECO-TOUCH Pgrm Wall Ctrl

ECO-TOUCH Ctrl Mural Pgrm

EDF1 Multi-Func Ctrl - Fantech Item Number: 40375 EDF1 Multi-Func Ctrl

EDF1 Déshum multi-fonctions

EDF7 Electronic Dehumidistat - Fantech Item Number: 44883 EDF7 Electronic Dehumidistat

EDF7 Déshum Élec Multi-fonct

MDEH1 Low Voltage Dehumidistat - Fantech Item Number: 40172 MDEH1 Low Voltage Dehumidistat

MDEH1 Déshumidistat

MGE4 Metal Exhaust Grill - Fantech Item Number: 411106 MGE4 Metal Exhaust Grill

MGE4 Grille d'évacuation métal

MGS4 Metal Supply Grill - Fantech Item Number: 411368 MGS4 Metal Supply Grill

MGS4 Grille d'air frais métal

RTS2 Pushbutton Timer - Fantech Item Number: 40164 RTS2 Pushbutton Timer

RTS2 Minuterie à bouton

RTS3 Pushbutton Timer - Fantech Item Number: 40376 RTS3 Pushbutton Timer

RTS3 Minuterie à bouton