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Dwell
VHR 704
Heat Recovery Ventilator
As the 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.
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.
Airflow up to 56 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
•
•
•
•
Maximum continuous airflow
Defrost cycle time
Net supply air flow
0.1” Ps
0.2” Ps
0.3” Ps
0.4” Ps
0.5” Ps
Temperature range OF
Run / Defrost time (min)
96
in.wg
cfm
85
67
56
42
23 to 14
40 / 3
30 / 5
20 / 5
Gross supply air flow
100
88
70
58
43
14 to 5
Gross exhaust airflow
104
88
73
59
43
5 & lower
Energy performance
Supply temperature
Net airflow
Consumed power
Sensible recovery
efficiency
Heating
Apparent sensible effectiveness
Latent recovery/moisture
transfer
F
cfm
W
%
%
-
32
55
36
57
67
-
O
32
67
40
55
64
-
32
84
40
54
60
-
-13
73
35
53
66
-
Specification data
Model
Duct
size
inch
V/~
W
A
cfm
VHR 704
4
120 / 1
48
0.4
58
fantech
Voltage /
phase
Rated
power
Max
amps
Average airflow
@ 0.4” Ps
Connection
Defrost
cycle
Shipping
weight
Top
Fan shutdown
35
Item #
List price
40392
826.00
lbs
USD