IBR Method
 
Exposed Wall:              320 x 8 (-400) x 75 DTD x .08            12960 btuh
 
Ceiling                          6000 x 75 DTD x .03                         13500
 
Floor                            320 x 75 DTD x 1.1                            26400
 
Openings                      400 x 75 DTD x .56                           16800
 
Infiltration                     6000 x 8 x 75 DTD x .018                    64,800
 
                        NOTE: c.100 lin ft crack @ 648 btuh per linear foot
 
                                                            Total                         134,460 btuh
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