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High Tunnel Vent |
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High tunnels are generally vented by
rolling up the sides and opening the doors on each end. However, additional
ventilation is often needed on extremely hot and humid days. The best
location for maximum ventilation is through the roof. Ken-Bar's High Tunnel
Vent is a roof-installed ventilation sytem that provides for a
chimney-effect movement of hot air out of the tunnel. However, these vents
are intended to be used for supplemental ventilation only; they are not the
primary mechanism for temperature control in high tunnels. The High Tunnel Vent is constructed
of crystal-clear rigid plastic mounted on an aluminum frame that measures
36" x 21". The size of the actual opening of the vent is 30" x
14". Two types of vent openers are available: manual and auto-temperature.
A hand-crank is used with the manual opener; but with the auto-temperature
opener, the vent opens and closes automatically within preset temperature
ranges The chart below demonstrates the dramatic
temperature
A further benefit from
venting warm air at the top of the tunnel is mositure control. Less moisture
in the air will mean less diesease for most crops grown in tunnels. Click on any image below to see an enlarged
version:
INSTALLATION TIPS The High Tunnel Vent is installed
from the inside of the tunnel. (Instructions are included with each vent).
Slits are made in the plastic so that the vent can be inserted and positioned
on the outside of the tunnel. To prevent water leakage, be careful not to cut
the slits any larger than the aluminum frame of the vent. When the vent is in place, insert the bent
wire (wiggle wire, wire lock) into the channels on each of the four sides.
(For the first installation, the job is easier with a second person.) After
installation, trim the plastic so that there is about a 2-inch flap beyond
the wire inserts. To maximize ventilation, the vent should be
installed as high up on the roof as possible. The present recommendation is
to place a vent about every 20 feet to realize the most effect. To purchase High Tunnel Vents click on the
link below. High
Tunnel Vent: Growers Solution |
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· SRM Red · Low Tunnels · Control Units · High Tunnel Vent |
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