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kemistry_gw

electric fan, air circulation and relative humidity

kemistry
13 years ago

Hello everyone,

I've been thinking of adding an electric fan to help circulate the air indoor during the Winter months (too cold to open the windows). My question is, will having a fan running caused a drop in the relative humidity level?

I don't have a humdifier to use at the moment so I'm a bit concern about this.

My plants are mainly small tropicals living together near the windows. (jasmine, gardenia, etc..)

Any inputs/thoughts are appreciated! :)

Comments (8)

  • meyermike_1micha
    13 years ago

    Having a fan on makes no difference in the humidity..It does help with prevention of mold and diseases..It can help with your containers drying out a little more rapidly...

    What does help is putting your plants on top of humidity trays..They make some for window sills and you could even come up with ideas on how to make your own..

    I use a big plastic saucer about 2 inches deep and fill with stones on the center on my table for my Orchids and Violets.....I also use styrofoam to raise or and set my pots on top of these, while the water settles around them..It helps my humid loving plants a lot..

    Usually a lot of plants grouped together can also create a mini micro climate around them too..

    Just my .02$

    Mike

  • pirate_girl
    13 years ago

    Hi Kemistry,

    I'm in NYC & I never completely close my windows; even in winter, they're usually open an inch or 1/2" minimum.

    That said, I grow many succulents which can stand the cold window sills, especially when I keep the plants dry.

    I don't think a pebble tray on a cold, snowy windowsill is the way to go. I'd suggest you pull your tropicals off the windowsills completely. They're unlikely to survive the combination of cold & wet, far too shocking for them.

    The few tropicals I still have are on a table several feet in from the window, & if I know it's going to get very cold, I try to wait to water until it's a sunny day.

  • rhizo_1 (North AL) zone 7
    13 years ago

    Kemistry lives in Oregon, zone 8. I don't think that sitting plants next to a window will be harmful. I do it in my zone 7 home! Always have. Though I don't open any windows, lol. If I did, the heat would run all the time, making it even drier inside. My cat is all static-y as it is!

    Kemistry, is your home exceptionally humid? Or do you have a great number of plants in one room? If no to both, I wonder if you really need a fan at all. I know that many people collect their plants in one location for the winter, and I can see the need for some air circulation.

  • jane__ny
    13 years ago

    I keep a small fan running near my orchids to increase air circulation. The house air is very dry even with two steam humidifiers running near by. My windows are cold. Air circulating cuts back the instance of fungal problems caused by the cool-damp area.

    Fans can cause drying of the leaves. Blowing dry air against leaf surface will cause rapid evaporation. This can be troublesome with thin-leafed orchids and some house plants. Leaves dry out and buds can blast. I use steam humidifiers to get more moisture higher up.

    Humidity trays provide little help they are really only drip trays. If you measure humidity you will see that the moisture in the trays rarely rises. What works for me is placing the plants close together and the small micro environment provides higher humidity levels, especially if the plants are layered in rows.

    I use the fans to keep the air moving. Blowing air on the humidity trays helps move the moisture but unless the air is warm, it really doesn't rise. I cram the plants close together in the window and get a better moisture content.

    Jane

    {{gwi:110556}}

  • tapla (mid-Michigan, USDA z5b-6a)
    13 years ago

    Blowing air over a moist surface is the principle that makes evaporative humidifiers effective, and is a very effective way to raise humidity in a room. The larger the area of the moist surface and the more air moving across it, the faster it will raise humidity levels.

    Case in point: I use a 16x24 humidity tray filled with gravel in my basement growing area. It sets on top of fluorescent lights suspended from chains. A 16" fan is situated very close to the tray and blows air directly on/across the tray. This set-up puts about 1/2 - 3/4 gallon of water in the air of a 20X20 room per day, and causes the RH of the growing room to rise by as much as 10-15% compared to when the tray is empty.

    I figured as long as I'm going to pay for the electricity to drive the fan, I might as well let the fan do most of the work of the supplemental humidifiers that kick in when the humidity tray alone can't keep up with humidity needs.

    Al

  • kemistry
    Original Author
    13 years ago

    A lot of great ideas and thoughts, thanks!

    I have about 30ish plants in the livingroom room and bedroom. They are grouped together to take advantage of the microclimate effect as Jane mentioned.

    For now I'll go ahead and buy a fan and employ the method suggested by Al to increase the RH. When I have extra money I'll invest in a humidifier.
    So again, thank you all for your contributions. : )

  • jane__ny
    13 years ago

    My plants are in my living room, I can't have trays of water laying around. The plants all sit on drip trays. My ceilings are high and the area large. Hard to get humidity levels up in the room. I just concentrate on the plant area.

    i prefer steam vaporizers because they warm the air and I don't have to worry about mold spores or filters. Plus, they are fairly cheap to buy...not to run.

    Jane