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Side Ventilation. — The eaves of the greenhouse should be built high enough 

 to permit the installation of plenty of ventilators along the side. Particularly 

 where the summer crop of cucumbers is to be grown. This crop, for best results, 

 requires side ventilation as well as ventilation of the ridge. There are various ways 

 of setting those side ventilators and a brief description of each may be of value. 

 The ventilator may take up practically the whole of the glass surface of the side of 

 the house or it may be limited to less. As a general rule too much ventilation on 

 the side cannot be had. Some growers prefer one continuous run of ventilation, 

 three or six lights in length and two or three lights wide. Others claim to have 

 equal success with about one-half the amount of ventilation given by means of 

 making the ventilators come alternate with equal sized spaces of stationary glass. 

 Side ventilators are used either opening directly beneath the eave plate or opening 

 from a header set right below the eave. Both give satisfaction and both have 



Ventilators at the ridge may open from the ridge or from a header. Both ways are 

 good. The majority prefer them to open from ridge. Continuous runs or broken 

 runs as shown are in favor. 



their advocates. Possibly those preferring the ventilator to be continuous and 

 opening from the header are in the majority. 



Ridge Ventilation. — This placing of ventilators has been in use since green- 

 houses were built on any scale and they are still a necessity. The ventilators in this 

 case are attached in two ways, namely, from the ridge board or from the header set 

 between the sash bars. In this way the vents open out from the ridge and from the 

 headers or more easily explained opening back to back and away from one another. 

 .From this arrangement we have in the case of one opening from the header the air 

 admitted in one large opening and going straight down into the house and in the 

 case of those opening from the ridge the air is admitted through two openings, the 

 air being deflected against the ventilator on the opposite side before going down. 

 In this way the force of the air is broken. 



