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 Vintage Fischer brass barometer hygrometer thermometer US $59.95 
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 Verichron Thermometer Barometer Hygrometer Wall Unit US $29.00
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 Digital Thermometer Hygrometer Indoor/Outdoor Humidity US $12.99
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 Vintage Barometer Thermometer Hygrometer Humidity SEARS ROEBUCK Wood Banjo 1960s US $.99
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 DIGITAL THERMOMETER/ HYGROMETER US $16.99
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 Weather Barometer Thermometer Hygrometer Round White US $29.95
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 VINTAGE AIRGUIDE MAROMETER THERMOMETER HYGROMETER US $26.99
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 Wooden Wall Plaque Thermometer & Hygrometer w/ Howling Wolf Picture US $26.50
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 Vintage Springfield Thermometer Barometer Hygrometer Weather Station Indicator US $24.89
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 Vintage Wood Barometer Thermometer Hygrometer Weather Station Wuersch USA,France US $40.00
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 Wood Framed Weather Station Barometer Thermometer Hygrometer Gold Coloured Dials US $42.60
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 ELECTRONIC WEATHER STATION BAROMETER THERMOMETER HYGROMETER DIGITAL ATOMIC CLOCK US $119.75
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 Vintage Springfield Weather Station Thermometer Barometer Hygrometer Wall Mount US $35.00
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 Taylor Humidiguide - Thermometer & Hygrometer - Temperature & Humidity Gauge US $4.50
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 VINTAGE AIRGUIDE BANJO BAROMETER HYGROMETER THERMOMETER WITH WEATHER CHART US $76.00
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 Vtg GERMANY Jason THERMOMETER / BAROMETER / HYGROMETER Wood Wall Plaque Colonial US $39.99
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 Handcrafted 31" SOLID OAK BANJO BAROMETER / THERMOMETER / HYGROMETER - Eagle Top US $165.99
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 VINTAGE WELBY BAROMETER THERMOMETER HYGROMETER CHERRY WOOD GERMANY NEED REPAIR US $29.99
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 Banjo Barometer With Thermometer Hygrometer 490mm US $85.34
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 Vintage Thermometer, Barometer, Hygrometer - Almanac US $10.64
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 Western Germany Temperature Gauge Thermometer Barometer Hygrometer US $29.99
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 Vintage Cube Desktop Weather Station Thermometer, Barometer, Hygrometer US $35.00
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 Weather Station Barometer Thermometer Hygrometer US $39.95
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Thermometer Hygrometer
Why Ventilation is Important in Hydroponics
Fresh air is at the centre of successful indoor gardening. Outside, air is abundant and almost always fresh. C02 levels in the air over a field of rapidly growing vegetation will vary on how still the air is. Being outdoors, and subject to the warming and cooling of the day, the wind blows in fresh air. Rain will cleanse the air of dust and pollutants. The outdoor environment is always moving. Plants grown indoors in a hydroponic system do not have the natural balance that is present out of doors and must be achieved indoors by way of fresh air ventilation or CO2 enrichment.
So you have decided to add CO2 to your hydroponic systems. Great! Welcome to the wonderful world of bigger yields. Now having said that, there is a caveat – like all good things – there can be some events to watch out for. For our purposes we will be dealing with the increases of humidity in a CO2 enriched environment.
Now what is humidity? Simply put – humidity is the water vapor present in the air. There are various devices used to measure and regulate humidity called psychrometers or hygrometers. You can regulate the humidity of a room with humidistat a variety of tools in your growing arsenal. These are comparable a thermometer and thermostat for temperature control. You can find from most retail outlets combination hygrometer/thermometer unit – we recommend looking for a quality wireless unit for ease of placement.
The humidity level should be in the range of 40-75% when your lights are on which can be measured with a hygrometer. Now the warmer the air, the more retained water- this means humidity levels can easily go beyond the recommended 40-75%. High humidity like this coupled with lower nighttime temperatures (a requirement to get plants like orchids to bloom) can cause condensation to form on leaves. Which means your hydroponic system would be a prime candidate for all sorts of fungus issues, like powdery mildew. Inadequate ventilation is the primary cause of most fungal diseases.
How do you prevent this?
Ventilation fans
Ventilation fans – both intake and outtake- help regulate temperature, CO2 levels and relative humidity. During the winter months, you're more likely to need a ventilation fan for dehumidification rather than reducing temperature. Air is not exchanged as frequently in winter, so plants naturally raise humidity without air being exhausted. Fans at too high a setting combined with high heat can lead to lower humidity levels as well – find the balance for your hydroponic system and it will take care of itself.
Blowers
These remove heat, which accumulates rapidly in indoor growing situations. Excess heat can result in excess humidity as the air retains for water. By pulling air in the side of the blower and pumping it out the front. For mounting on a wall or inside a grow box units have a flange on the front. Some feature a round inlet flange for connecting ducting so you can pull air from another room.
Keep fresh air flowing, and watch your indoor garden grow!
About the Author
Check out more information about
href="http://www.youtube.com/watch?v=H2aUXa7uwV8">hydroponic
systems or categories/cat-380/hydroponic_systems.html">in home gardens at
my website. It's a site dedicated to
href="http://www.youtube.com/watch?v=H2aUXa7uwV8">hydroponics
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