76 



The Florists^ Review 



JnLY 6, 1916. 



of the room and then along the sides 

 to the garage. This will make seven 

 pipes on each side wall of the cucum- 

 ber house and three on each wall of the 

 carnation house. Connect the pipes on 

 each side wii^ the boiler by means of 

 a U%-inch return. 



BUIIiDINa AND PIPINa A HOUSE. 



I am planning to build a greenhouse 

 23x100, with 4-foot concrete walls and 

 two feet of glass above the concrete. I 

 wish to place the heating coils on the 

 outside walls and have no pipes under- 

 neath the beds. How many 2-inch pipes 

 will be needed in the house? It is 

 to be used for general retail purposes. 

 A 3-inch pipe will rise from the boiler 

 to what will be the highest point of the 

 system. Will 2-inch pipe do for the 

 flows? "Will it be satisfactory to have 

 the boiler on a level with the green- 

 house? If not, how deep a pit will be 

 necessary? 



Would 16x16 glass be a good size? 

 How should I arrange the benches to 

 get the most possible room? How can I 

 make concrete benches? How thick 

 should the greenhouse walls be? What 

 should be the height of the greenhouse 

 in the center? In the coldest weather 

 in this locality the outside tempera- 

 ture sometimes drops to 20 degrees be- 

 low zero, but only for a week or so. I 

 shall have patent ventilators. What 

 size should the ventilators be? Should 

 they be continuous? 



L. M. & S.— N, S. 



For heating the house described, we 

 would use two 3-inch flow pipes on the 

 plates and fourteen 2-inch returns, mak- 

 ing one flow and seven returns on each 

 wall. If the end of the house farthest 

 from the boiler is exposed to the pre- 

 vailing cold winds, it would be desir- 

 able to provide radiation along the end 

 of the house. In that case we would 

 run a 2i/4-inch flow on each plate and 

 with each flow feed four 2-inch returns. 

 Then run a third flow, 2V^-inch, 

 about three feet below the ridge, and 

 at the farther end of the house connect 

 it with six 2-inch returns. Run three 

 of these each way to the corners of the 

 house and then along the sides of the 

 house back to the boiler. While 2- 

 inch pipe might be used for the flows, 

 we prefer to use the larger sizes. If 

 for any special reason the smaller size 

 is desirable, at least five flows and 

 twelve returns will be needed. 



It would be well to have 4-inch pipes 

 for the main flows and returns, since at 

 least 1,100 square feet of radiation will 

 be needed, but if the 3-inch main is 

 not too long it will answer. The best 

 circulation will be obtained if the top 

 of the boiler is as low as the coils, or 

 lower. While 16xl6-inch glass answers 

 well, we would prefer 16x20 or even 

 16x24. 



We do not consider twenty-three feet 

 as economical a width as one a little 

 wider or narrower. The benching de- 

 pends upon the class of plants to be 

 grown, but we would suggest the use of 

 three benches, with narrow walks next 

 to the walls and two slightly wider 

 walks between the benches, or a bed 

 two and one-half feet wide at each wall 

 and three beds about four feet wide in 

 the middle of the house. If the house is 

 to be used merely for growing, the out- . 

 side walks need not be more than fif- 

 teen inches wide, but it would be well 

 to give the others a width of eighteen 



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