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A-frame advantage African violets Artificial light attached Automatic controls available for greenhouse benches are serviced build carbon dioxide coldframe construction cool cost courtesy of Lord covered cross rafters ducts are suspended eave height electric heat evaporative cooler even-span greenhouse exhaust fans fiberglass foot of growing foot-candles freestanding greenhouse gardener glass greenhouse glass or plastic grow tall plants heating equipment heating system hobby greenhouse hotbed humidity inches incoming air evenly inner layer installed kerosene layer of plastic lene light meters Lord & Burnham MIST PROPAGATION CONTROLS multiply needed number of square panels perature of 60 Photo courtesy plant benches plant growth Plastic greenhouses polyethylene duct distributes require Rollup screens roof vents sash bar side benches sidewalls soil solenoid space heaters square foot structure tape or cable temperature temperature difference thermostat Timeclock tion Tri-Penta Greenhouse tube tural TYPES OF GREENHOUSES Vinyl plastic shading widths window-mounted