Duct Stat FAQ
What will a DuctStat do for me?
The DuctStat Line Voltage Thermostat greatly simplifies the installation of the
power supply to any of our Inductor In-Line Duct Booster Fans.
Tell me how it simplifies the installation:
When you install an Inductor, it often happens to be in a location far from your
furnace system. Air has a long run to those areas and loses much of its volume
and heat (cool in the summer) along the way.
This also means that the wire you must run has to go a long distance.
Perhaps you have dry walled ceiling in you basement, making it difficult if not
impossible to run a wire from the Inductor to the furnace for operating power.
No matter what reason, the DuctStat allows you to control the automatic ON/OFF
function of your Inductor locally, both for winter heating and summer cooling.
Where do I install the DuctStat?
The preferred location of the DuctStat is just ahead (downstream) from the
Inductor fan but not closer than 8 inches. Otherwise, anywhere on a duct where
it can sense heated or cooled air.
How do I install the DuctStat?
The DuctStat is an electronic temperature sensitive line voltage thermostat,
meaning it switches a 110-120 Volt AC outlet on the front panel ON and OFF
depending on the user preset temperature.
It mounts on the duct in which your Inductor is installed with 2 or 4 sheet
metal screws. You will make a small ½" hole in the metal duct before
installing the DuctStat. The DuctStat has a corresponding hole in the back of
the housing. This allows a small amount of air to flow through the DuctStat over
the temperature-sensing element, thus sensing if your furnace is running (heated
air) or if your air conditioner is running (cooled air).
Can I build a DuctStat into a wall, i.e.
drywall or panel over it?
No. The DuctStat must remain accessible. You will have to switch the function
switch to HEAT for the winter and COOL for the summer. You may also need access
for service, cleaning or to replace the front panel fuse.
Can I use it to control other stuff depending
Yes. Simply mounted on a wall, the DuctStat will sense ambient temperature and
turn device ON or Off at a user selected temperature.
You may control any device with a 5 Amp maximum load such as: a warning siren or
light, electric operated vent louver, the ThruWall
Fan, Airiva Heat Recovery Ventilators, solar panel
fans, greenhouse louvers or fans, etc.
How many Inductor fans can I control with the
The maximum load is 5 Amp. Simply add up the Amp rating and do not exceed 5 Amp.
Can I switch loads greater than 5 Amp?
No. However, you can switch a large relay ON and OFF with the DuctStat. You
maximum load is now determined by the current capacity of that relay.
How do I get 110-120 Volt AC power to the DuctStat?
The DuctStat has a 6 feet long power cord with a grounded plug. Simply plug it
into the nearest outlet. If you do not have an electric outlet within 6 feet,
you will have to install one.
How do I connect the Inductor to the DuctStat?
You will have to install a cord and grounded plug assembly on the Inductor. That
plug will simply plug into the outlet on the front of the DuctStat.
What is the temperature adjustment range of
The user selectable temperature range (ON/OFF switching range) of the DuctStat
is approximately 40°F (4°C) to 110°F (43°C).
How sensitive is the DuctStat?
The electronic circuitry is very sensitive. The sensing element will react to
changing temperatures in a few seconds. The differential between ON and OFF can
be selected by the user to be 3°F and 6°F with a Min-Max switch on the control
The higher 6°F differential setting is provided to reduce possible ON/OFF
cycling of the thermostat when temperature increases or decreases are not
How safe is the DuctStat?
The DuctStat has been rigorously tested to the standards of Underwriters
Laboratories Inc. (UL©). The housing is made of a high strength ABS -
Polycarbonate, flame retardant alloy. The electronics and panel outlet are fused
by a replaceable 5 Amp panel fuse. Internally, the unit has two additional
levels of fuse protection.
Both the power cord and panel outlet are 3-prong grounded.
How much power does the DuctStat use?
The standby power consumption of the DuctStat is minimal. Less than 2 Watts.
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