I 
i.- November, 1916 THE GARDEX ^MAGAZINE 
129 
Here is a specialty house, the owner having a fancy for Orchids. It is useless to attempt the cultivation of exacting sub- 
jects in one general house 
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■ I furnace itself, and also protects the sur- 
I rounding materials from danger of fire. 
PIPING 
In all small houses the flows or supply pipes 
, and the returns or coils are placed under the 
; benches. Only in large commercial houses 
I is the piping carried overhead which, because 
of the size of the house secures an equal dis- 
I tnbution of heat. The best piping is that 
made of cast iron. Wrought iron is also good. 
; , Cast steel is not advisable. 
In both hot water and steam systems, there 
I are three positions possible for the piping; i. e., 
, I level; slanting upward away from the location 
I of the boiler; or downward away from it. 
The location of the boiler oftentimes deter- 
! mines which will be best. The aim is to create 
I the freest possible circulation and the greatest 
pressure at the highest point, but in a small 
structure it will make comparatively little 
difference which is used. In all cases, of 
- ' course, the flow pipe issues from the highest 
■ part of the boiler, the return entering it near 
• I the base. The coils both flow and return, 
I ' should be valved, especially when there is 
i more than one compartment, a main being 
I connected to each compartment. The house 
: can then be run as two units. The sizes of 
I I pipe commonly used have already been men- 
' ' tinned; hot water requires larger piping than 
* steam, and it is rarely wise to use a pipe of 
k| smaller diameter than two inches for any 
I ' system. The flow pipes should always be the 
I larger, connecting at their extremity with the 
Ij series of smaller coils. 
j HOT AIR HEATING 
' Heating by hot air includes anything from a 
r, : small kerosene stove to a large hot air furnace, 
II but as a general thing, none of these systems 
j is profitable. In a very small conservatory 
I or veranda greenhouse, it might pay to use a 
hi small oil or gas heater, carrying a flue through 
iij the house and out at the other end. Unless 
the combustion is very complete, the fumes 
are liable to injure the plants, hence it is 
always wise to arrange a hood and chimney 
to carry off the gases and smoke. 
A flue for this sort of heating may be of 
metal, of brick or of tile, but it should be at 
least five inches in diameter. There must be a 
continuous rise from the fire to the chimney 
so as to produce good draught. A hot water 
heating plant will give the maximum satis- 
faction with the greatest economy of installa- 
tion and maintenance. 
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The greenhouse sun-parlor, which is practical only in connection with an extension range of glass. It is a connecting link and belongs rather to the dwelling 
