Vent Openers & Fittings
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Vent openers are the
ventilation made in the roof or side walls of the Green Houses, to let
the fresh air come in. Vent Openers are of various types, some are solar
powered, and some are automatic.
Automatic Vent Openers
Vent openers do not require electricity. The opener has a metal
cylinder containing a mineral which expands when heated. This pushes a
piston that opens the vent. As the temperature cools, the mineral
shrinks and a spring closes the vent and resets the piston. The opening
and closing of the vent is gradual allowing just the right amount of air
flow for cooling.
Solar Powered Vent Openers
This vent opener uses a very simple principal - Special waxes have an
expansion rate of about 18% when heated by the sun. As the air in the
greenhouse heats up it also heats the power tube in the vent opener. As
the wax expands it pushes out a stainless steel piston that slowly opens
the vent up to 13 inches. The hotter the temperature the wider the
opening. When the temperature cools the weight of the vent and a 6 1/2
pound stainless steel spring closes the vent and holds it closed. This
allows the opener to be installed on the roof or a side wall.
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Door Hardware Marketplace |
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