projects like fireplaces which partake of the nature of 

 luxuries. However, if an officer elects to construct a 

 fireplace in Forest Service quarters from his own funds and 

 with the full understanding that the Service assumes no 

 responsibility of refunding the cost of the fireplace in 

 case the officer is transferred, there is no objection to 

 his doing so. The following specifications and accom- 

 panying diagram describe a fireplace which wUli heat and 

 draw satisfactorily. 



Width of opening at face 44" ; height of opening 

 at side 36"; height at center of arch, 38"; depth of fire- 

 place (front to back), 20; width of fcack wall, 28"; height 

 of vertical portion of back wall, 18"; width of head, 39"; 

 depth of throat, 5"; dimensions of chimney flue (at top of 

 choker), 14" x 16"; flarfr of flue, l n in 5 T ; drop of fire- 

 place floor at back, 1" \ an ash chute may be provided 

 through base and out the back of the fireplace, -if used its 

 width should be ao opening 4 inches square. 



Detailed dimensions can be changed to suit, so 

 long as there are observed the principles which govern the 

 two essential objects of fireplace construction, namely, 

 maximum draft and maximum heat reflection into the room 

 to be heated. These may be summarized into construction 

 rules, as follows: 



A. Rules for Securing Good Draft. 



1. The throat must extend across the full width 

 of the fireplace, and its depth (front to back) should be 

 approximately ne-third the depth of the fireplace rt the 

 floor line, 



2, The chimney flue above the throat should hava 

 a cross section aree about 10$ greater than that of the 

 throat, and should increase upward at the rate of about 



1" in 5 r for ordinary conditions, This flare in the flue, 

 which commonly neglected, is essential to perfect draft. 



B. Rules to Secure Efficient Heat Reflections. 



1. The fireplace must not be too deep (front tv 

 back). A depth equal to one-quarter the front width may 

 be called shallow, three-eighths moderate, one-half deep, 

 over one-half very deep. The defcth should not ordinarily 

 be greater than one-half the width,- in most cases less. 



B.M. (20) 



