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Dwell
VH 704
Heat Recovery Ventilator
As the Fantech's smallest and most compact top duct connection HRV,
the VH 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 VH 704
is equipped with automatic defrost mechanisms so even if you live in the
coldest climates you can use your HRV all year long.
Unit is designed to operate continuously on a single speed. The automatic
defrost cycle consists of a fan shutdown: when the supply air stream
temperature goes below 23°F, the supply motor shuts down, while the
exhaust motor continues to ventilate. Ambient air is passed through the
unit for a period of 3 or 5 minutes. The supply motor will then re-start and
run at the preset speed.
Airflow up to 56 cfm @ 0.4” Ps serves 1 to 2 bedroom homes
Single speed ventilation; no controls needed
Includes easy-mount wall bracket
•
•
•
Maximum continuous airflow
in.wg
Defrost cycle time
0.1” Ps
0.2” Ps
0.3” Ps
0.4” Ps
0.5” Ps
Temperature range OF
Run / Defrost time (min)
Net supply air flow
96
85
67
56
42
23 to 14
40 / 3
Gross supply air flow
100
88
70
58
43
14 to 5
30 / 5
Gross exhaust airflow
104
88
73
59
43
5 & lower
20 / 5
cfm
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
-
32
67
40
55
64
-
O
32
84
40
54
60
-
-13
73
35
53
66
-
Specification data
Model
Duct
size
inch
V/~
W
A
cfm
VH 704
4
120 / 1
48
0.4
56
fantech
Voltage /
phase
Rated
power
Max
amps
Average airflow
@ 0.4” Ps
Connection
Defrost
cycle
Shipping
weight
Top
Fan shutdown
32
Item #
List price
40358
748.00
lbs
USD