Maximum Yield Australia/New Zealand January/February 2020 | Page 44
A DUCT RUN,
“ THE THE LONGER
MORE RESISTANCE.
This resistance reduces the fan’s
power and ability to move air.”
Ducting Length
Another important consideration when setting up a
heat recycling ventilation system is the overall length
of the exhaust ducting. The longer a duct run, the more
resistance. This resistance reduces the fan’s power and
ability to move air. Because of this, the most efficient
and effective way to recycle heat from one grow space to
another is to have the two grow spaces adjacent or very
close to each other. If a longer duct run is required, it may
be necessary to increase the fan size so it has enough
power to adequately move the heated air. Assuming the
grower has or can build two adjacent flowering rooms, an
additional fan, ducting, and a relay or flip light controller
are the only pieces of equipment needed to create a heat
recycling system.
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A relay or flip-box lighting controller allows two lamps to be
powered by a single ballast (on opposite 12-hour photoperiods,
not simultaneously). The ballast connected to a flip-box
light controller operates continuously. A 12-hour cycle timer
triggers the relay within the flip-box and the ballast’s output
power is routed from one lamp to the other. Put another way,
every 12 hours, the flip-box lighting controller’s relay switch
engages and the light cycles of the two blooming rooms
alternate. In addition to the benefit of recycling heat from one
growroom to another, flip-box light controllers allow an indoor
horticulturist to operate two flowering rooms on half as many
ballasts. Essentially, these devices allow two light bulbs, on
opposite 12-hour light cycles, to be operated by one ballast.
For example, a grower with a 20-light flip-box light controller
could operate a maximum of 40 lamps from 20 ballasts. Just
about all flip-box light controllers are integrated with, or
directly connected to, a timer which ensures the two flowering
rooms’ photoperiods will never overlap and remain on perfect
12-hour lights on and 12-hour lights off cycles.
Back-Up Cooling Device
In the rare instance too much heat is exhausted into the lights
off garden space and the temperature exceeds the desired
range, another cooling device, such as an air conditioner or
an additional exhaust fan, can be used as a fail-safe. A small
exhaust fan equipped with a cooling thermostat is all most
indoor gardens will need as a backup cooling device.
• 9” LCD touchscreen for complete system control
• User-configurable control settings for entire system
• Field upgrade for number of sensors & gas types
42
Relay or Flip-Box
Recycling heat within a dual flowering room setup is one
of the best ways an indoor horticulturist, who lives in a
cooler climate, can improve his or her garden’s overall
efficiency. Instead of redirecting the excess heat outside, a
grower can take a few steps to implement a heat recycling
system. Sometimes small growroom changes can compound
to big savings. When applicable, heat recycling is one of
those small changes that can result in immediate benefits.
Specialised equipment, such
as a flip-box lighting controller,
further increases the efficiency
of heat recycling dual flowering
room setups. Indoor growers
are always looking for methods
to increase their return on
investment through heightened
efficiency. For many growers, a
dual flowering room, complete
with heat recycling and a flip-
box lighting controller, is the
most effective and efficient
method for indoor cultivation
during the winter months.