P&K KFA (VDI 3781 Part 4)Sample Report (Log) P:\Builds\P&K KFA\Samples\vdi_A1.kfa Sample A 1 from the guideline. Real building ensemble Calculation for the exhaust gas discharge system 'X1'Details for building 'House 1'  Symmetric pitch roof α ≥ 20°Quantity  Parameter  Value 

Height of ground over origin of coordinates (Section 6.2.4, Figure 10)  Δh  2.10 m  Ridge height  H_{First}  11.50 m  Eaves height (Figure 4)  H_{Traufe}  7.50 m  Actual roof height (Figure 4, Section 6.2.1.2.2)  H_{Dach}  4.00 m  Width of half of the gable end opposite the outlet. For symmetric roof this will be b/2 else b  b_{Luv}  6.70 m  Horizontal distance between the center of the outlet crosssection and the ridge (Figure 4)  a  0.06 m  Roof pitch angle (Figure 4)  α  30.84 °  Roof pitch correction (interpolated with table 2)  γ  0.56 °  Factor for determining H_{2} (interpolated with table 2)  f  0.69  Height of recirculation zone for distance a to ridge (Equation 1)  H_{1}  0.04 m  Maximum height of the recirculation zone (Equation 2)  H_{2}  2.76 m  Calculated height of exhaust gas discharge system over ridge (Equation 3)  H_{S1}  0.04 m  Horizontal extend of the recirculation zone (Equation 15, Figure 8)  l_{RZ}  18.20 m  Effective length of an upstream building (Equation 16, Figure 8)  l_{eff}  13.44 m  Angle between the gable side of the upstream building and the line to exhaust gas discharge system (Section 6.2.2.1, Figure 8)  β  89.87 °  Horizontal distance of the exhaust gas discharge system from the upstream building (Figure 8)  l_{A}  17.52 m  Height of the outlet required by the upstream buildings over the ridge of 'House 3' (Equation 17, Figure 8)  H_{S2}  8.64 m 
Details for building 'House 2'  Symmetric pitch roof α ≥ 20°Quantity  Parameter  Value 

Height of ground over origin of coordinates (Section 6.2.4, Figure 10)  Δh  0.00 m  Ridge height  H_{First}  6.80 m  Eaves height (Figure 4)  H_{Traufe}  3.40 m  Actual roof height (Figure 4, Section 6.2.1.2.2)  H_{Dach}  3.40 m  Width of half of the gable end opposite the outlet. For symmetric roof this will be b/2 else b  b_{Luv}  6.35 m  Horizontal distance between the center of the outlet crosssection and the ridge (Figure 4)  a  30.78 m  Roof pitch angle (Figure 4)  α  28.17 °  Roof pitch correction (interpolated with table 2)  γ  0.00 °  Factor for determining H_{2} (interpolated with table 2)  f  0.73  Height of recirculation zone for distance a to ridge (Equation 1)  H_{1}  16.48 m  Maximum height of the recirculation zone (Equation 2)  H_{2}  2.47 m  Calculated height of exhaust gas discharge system over ridge (Equation 3)  H_{S1}  2.47 m  Horizontal extend of the recirculation zone (Equation 15, Figure 8)  l_{RZ}  13.07 m  Effective length of an upstream building (Equation 16, Figure 8)  l_{eff}  10.30 m  Angle between the gable side of the upstream building and the line to exhaust gas discharge system (Section 6.2.2.1, Figure 8)  β  6.58 °  Horizontal distance of the exhaust gas discharge system from the upstream building (Figure 8)  l_{A}  24.59 m  The exhaust gas discharge system is outside the recirculation zone  H_{S2}  0.00 m 
Details for building 'House 3'  Symmetric pitch roof α ≥ 20°Quantity  Parameter  Value 

Height of ground over origin of coordinates (Section 6.2.4, Figure 10)  Δh  0.00 m  Ridge height  H_{First}  10.40 m  Eaves height (Figure 4)  H_{Traufe}  6.70 m  Actual roof height (Figure 4, Section 6.2.1.2.2)  H_{Dach}  3.70 m  Width of half of the gable end opposite the outlet. For symmetric roof this will be b/2 else b  b_{Luv}  5.65 m  Horizontal distance between the center of the outlet crosssection and the ridge (Figure 4)  a  0.00 m  Roof pitch angle (Figure 4)  α  33.22 °  Roof pitch correction (interpolated with table 2)  γ  2.15 °  Factor for determining H_{2} (interpolated with table 2)  f  0.66  Height of recirculation zone for distance a to ridge (Equation 1)  H_{1}  0.00 m  Maximum height of the recirculation zone (Equation 2)  H_{2}  2.43 m  Calculated height of exhaust gas discharge system over ridge (Equation 3)  H_{S1}  0.00 m 
Details for building 'House 4'  Symmetric pitch roof α ≥ 20°Quantity  Parameter  Value 

Height of ground over origin of coordinates (Section 6.2.4, Figure 10)  Δh  0.00 m  Ridge height  H_{First}  7.00 m  Eaves height (Figure 4)  H_{Traufe}  3.40 m  Actual roof height (Figure 4, Section 6.2.1.2.2)  H_{Dach}  3.60 m  Width of half of the gable end opposite the outlet. For symmetric roof this will be b/2 else b  b_{Luv}  4.95 m  Horizontal distance between the center of the outlet crosssection and the ridge (Figure 4)  a  35.01 m  Roof pitch angle (Figure 4)  α  36.03 °  Roof pitch correction (interpolated with table 2)  γ  4.02 °  Factor for determining H_{2} (interpolated with table 2)  f  0.62  Height of recirculation zone for distance a to ridge (Equation 1)  H_{1}  21.88 m  Maximum height of the recirculation zone (Equation 2)  H_{2}  2.23 m  Calculated height of exhaust gas discharge system over ridge (Equation 3)  H_{S1}  2.23 m  Horizontal extend of the recirculation zone (Equation 15, Figure 8)  l_{RZ}  17.55 m  Effective length of an upstream building (Equation 16, Figure 8)  l_{eff}  15.63 m  Angle between the gable side of the upstream building and the line to exhaust gas discharge system (Section 6.2.2.1, Figure 8)  β  37.46 °  Horizontal distance of the exhaust gas discharge system from the upstream building (Figure 8)  l_{A}  37.87 m  The exhaust gas discharge system is outside the recirculation zone  H_{S2}  0.00 m 
Details for building 'House 5'  Symmetric pitch roof α ≥ 20°Quantity  Parameter  Value 

Height of ground over origin of coordinates (Section 6.2.4, Figure 10)  Δh  1.70 m  Ridge height  H_{First}  11.00 m  Eaves height (Figure 4)  H_{Traufe}  6.10 m  Actual roof height (Figure 4, Section 6.2.1.2.2)  H_{Dach}  4.90 m  Width of half of the gable end opposite the outlet. For symmetric roof this will be b/2 else b  b_{Luv}  7.80 m  Horizontal distance between the center of the outlet crosssection and the ridge (Figure 4)  a  6.22 m  Roof pitch angle (Figure 4)  α  32.14 °  Roof pitch correction (interpolated with table 2)  γ  1.42 °  Factor for determining H_{2} (interpolated with table 2)  f  0.67  Height of recirculation zone for distance a to ridge (Equation 1)  H_{1}  3.69 m  Maximum height of the recirculation zone (Equation 2)  H_{2}  3.29 m  Calculated height of exhaust gas discharge system over ridge (Equation 3)  H_{S1}  3.29 m  Horizontal extend of the recirculation zone (Equation 15, Figure 8)  l_{RZ}  23.68 m  Effective length of an upstream building (Equation 16, Figure 8)  l_{eff}  19.54 m  Angle between the gable side of the upstream building and the line to exhaust gas discharge system (Section 6.2.2.1, Figure 8)  β  76.37 °  Horizontal distance of the exhaust gas discharge system from the upstream building (Figure 8)  l_{A}  16.83 m  Height of the outlet required by the upstream buildings over the ridge of 'House 3' (Equation 17, Figure 8)  H_{S2}  1.35 m 
Height of recirculation zones for the upstream buildings at the outlet system 'X1' over ridge 'House 3'Name of the building  Height of recirculation zone H_{S2} 

House 1  8.64 m  House 2    House 4    House 5  1.35 m 
Calculation for the outlet 'X1' on building 'House 3' All heights over ridgeQuantity  Value 

Parameter for solid fuel combustion. Nominal heat output: 15 kW  Additive term H_{Ü} (Table 1)  0.40 m  Outlet height above reference level H_{B} (Table 3)  1.00 m  Radius of exposure zone R (Table 3)  15.00 m  Outlet building  Required outlet height for outlet building H_{A1}=H_{S1}+H_{Ü} (Equation 4)  0.40 m  Upstream buildings  Highest recirculation zone from an upstream building H_{A2}=H_{S2}+H_{Ü} (Equation 19)  1.75 m  Required outlet height for undisturbed removal H_{A}=max(H_{A1},H_{A2) (Figure 2)})  1.75 m  Exposure zone  Highest air intake in exposure zone R H_{F}  10.40 m  Required outlet height for adequate dilution H_{E}=H_{F}+H_{B}  9.40 m 
 Height of exhaust gas discharge system H_{M}=max(H_{A},H_{E}) over the ridge  1.8 m 
Sample A 1 from the guideline. Real building ensemble Calculation for the exhaust gas discharge system 'X2'Details for building 'House 1'  Symmetric pitch roof α ≥ 20°Quantity  Parameter  Value 

Height of ground over origin of coordinates (Section 6.2.4, Figure 10)  Δh  2.10 m  Ridge height  H_{First}  11.50 m  Eaves height (Figure 4)  H_{Traufe}  7.50 m  Actual roof height (Figure 4, Section 6.2.1.2.2)  H_{Dach}  4.00 m  Width of half of the gable end opposite the outlet. For symmetric roof this will be b/2 else b  b_{Luv}  6.70 m  Horizontal distance between the center of the outlet crosssection and the ridge (Figure 4)  a  5.71 m  Roof pitch angle (Figure 4)  α  30.84 °  Roof pitch correction (interpolated with table 2)  γ  0.56 °  Factor for determining H_{2} (interpolated with table 2)  f  0.69  Height of recirculation zone for distance a to ridge (Equation 1)  H_{1}  3.33 m  Maximum height of the recirculation zone (Equation 2)  H_{2}  2.76 m  Calculated height of exhaust gas discharge system over ridge (Equation 3)  H_{S1}  2.76 m  Horizontal extend of the recirculation zone (Equation 15, Figure 8)  l_{RZ}  21.61 m  Effective length of an upstream building (Equation 16, Figure 8)  l_{eff}  16.88 m  Angle between the gable side of the upstream building and the line to exhaust gas discharge system (Section 6.2.2.1, Figure 8)  β  77.79 °  Horizontal distance of the exhaust gas discharge system from the upstream building (Figure 8)  l_{A}  17.83 m  Height of the outlet required by the upstream buildings over the ridge of 'House 3' (Equation 17, Figure 8)  H_{S2}  4.44 m 
Details for building 'House 2'  Symmetric pitch roof α ≥ 20°Quantity  Parameter  Value 

Height of ground over origin of coordinates (Section 6.2.4, Figure 10)  Δh  0.00 m  Ridge height  H_{First}  6.80 m  Eaves height (Figure 4)  H_{Traufe}  3.40 m  Actual roof height (Figure 4, Section 6.2.1.2.2)  H_{Dach}  3.40 m  Width of half of the gable end opposite the outlet. For symmetric roof this will be b/2 else b  b_{Luv}  6.35 m  Horizontal distance between the center of the outlet crosssection and the ridge (Figure 4)  a  25.13 m  Roof pitch angle (Figure 4)  α  28.17 °  Roof pitch correction (interpolated with table 2)  γ  0.00 °  Factor for determining H_{2} (interpolated with table 2)  f  0.73  Height of recirculation zone for distance a to ridge (Equation 1)  H_{1}  13.46 m  Maximum height of the recirculation zone (Equation 2)  H_{2}  2.47 m  Calculated height of exhaust gas discharge system over ridge (Equation 3)  H_{S1}  2.47 m  Horizontal extend of the recirculation zone (Equation 15, Figure 8)  l_{RZ}  13.38 m  Effective length of an upstream building (Equation 16, Figure 8)  l_{eff}  10.63 m  Angle between the gable side of the upstream building and the line to exhaust gas discharge system (Section 6.2.2.1, Figure 8)  β  8.26 °  Horizontal distance of the exhaust gas discharge system from the upstream building (Figure 8)  l_{A}  18.98 m  The exhaust gas discharge system is outside the recirculation zone  H_{S2}  0.00 m 
Details for building 'House 3'  Symmetric pitch roof α ≥ 20°Quantity  Parameter  Value 

Height of ground over origin of coordinates (Section 6.2.4, Figure 10)  Δh  0.00 m  Ridge height  H_{First}  10.40 m  Eaves height (Figure 4)  H_{Traufe}  6.70 m  Actual roof height (Figure 4, Section 6.2.1.2.2)  H_{Dach}  3.70 m  Width of half of the gable end opposite the outlet. For symmetric roof this will be b/2 else b  b_{Luv}  5.65 m  Horizontal distance between the center of the outlet crosssection and the ridge (Figure 4)  a  5.65 m  Roof pitch angle (Figure 4)  α  33.22 °  Roof pitch correction (interpolated with table 2)  γ  2.15 °  Factor for determining H_{2} (interpolated with table 2)  f  0.66  Height of recirculation zone for distance a to ridge (Equation 1)  H_{1}  3.40 m  Maximum height of the recirculation zone (Equation 2)  H_{2}  2.43 m  Calculated height of exhaust gas discharge system over ridge (Equation 3)  H_{S1}  2.43 m 
Details for building 'House 4'  Symmetric pitch roof α ≥ 20°Quantity  Parameter  Value 

Height of ground over origin of coordinates (Section 6.2.4, Figure 10)  Δh  0.00 m  Ridge height  H_{First}  7.00 m  Eaves height (Figure 4)  H_{Traufe}  3.40 m  Actual roof height (Figure 4, Section 6.2.1.2.2)  H_{Dach}  3.60 m  Width of half of the gable end opposite the outlet. For symmetric roof this will be b/2 else b  b_{Luv}  4.95 m  Horizontal distance between the center of the outlet crosssection and the ridge (Figure 4)  a  29.36 m  Roof pitch angle (Figure 4)  α  36.03 °  Roof pitch correction (interpolated with table 2)  γ  4.02 °  Factor for determining H_{2} (interpolated with table 2)  f  0.62  Height of recirculation zone for distance a to ridge (Equation 1)  H_{1}  18.35 m  Maximum height of the recirculation zone (Equation 2)  H_{2}  2.23 m  Calculated height of exhaust gas discharge system over ridge (Equation 3)  H_{S1}  2.23 m  Horizontal extend of the recirculation zone (Equation 15, Figure 8)  l_{RZ}  17.54 m  Effective length of an upstream building (Equation 16, Figure 8)  l_{eff}  15.61 m  Angle between the gable side of the upstream building and the line to exhaust gas discharge system (Section 6.2.2.1, Figure 8)  β  42.30 °  Horizontal distance of the exhaust gas discharge system from the upstream building (Figure 8)  l_{A}  33.01 m  The exhaust gas discharge system is outside the recirculation zone  H_{S2}  0.00 m 
Details for building 'House 5'  Symmetric pitch roof α ≥ 20°Quantity  Parameter  Value 

Height of ground over origin of coordinates (Section 6.2.4, Figure 10)  Δh  1.70 m  Ridge height  H_{First}  11.00 m  Eaves height (Figure 4)  H_{Traufe}  6.10 m  Actual roof height (Figure 4, Section 6.2.1.2.2)  H_{Dach}  4.90 m  Width of half of the gable end opposite the outlet. For symmetric roof this will be b/2 else b  b_{Luv}  7.80 m  Horizontal distance between the center of the outlet crosssection and the ridge (Figure 4)  a  1.47 m  Roof pitch angle (Figure 4)  α  32.14 °  Roof pitch correction (interpolated with table 2)  γ  1.42 °  Factor for determining H_{2} (interpolated with table 2)  f  0.67  Height of recirculation zone for distance a to ridge (Equation 1)  H_{1}  0.87 m  Maximum height of the recirculation zone (Equation 2)  H_{2}  3.29 m  Calculated height of exhaust gas discharge system over ridge (Equation 3)  H_{S1}  0.87 m  Horizontal extend of the recirculation zone (Equation 15, Figure 8)  l_{RZ}  21.03 m  Effective length of an upstream building (Equation 16, Figure 8)  l_{eff}  16.53 m  Angle between the gable side of the upstream building and the line to exhaust gas discharge system (Section 6.2.2.1, Figure 8)  β  87.07 °  Horizontal distance of the exhaust gas discharge system from the upstream building (Figure 8)  l_{A}  19.47 m  Height of the outlet required by the upstream buildings over the ridge of 'House 3' (Equation 17, Figure 8)  H_{S2}  3.30 m 
Height of recirculation zones for the upstream buildings at the outlet system 'X2' over ridge 'House 3'Name of the building  Height of recirculation zone H_{S2} 

House 1  4.44 m  House 2    House 4    House 5  3.30 m 
Calculation for the outlet 'X2' on building 'House 3' All heights over ridgeQuantity  Value 

Parameter for solid fuel combustion. Nominal heat output: 15 kW  Additive term H_{Ü} (Table 1)  0.40 m  Outlet height above reference level H_{B} (Table 3)  1.00 m  Radius of exposure zone R (Table 3)  15.00 m  Outlet building  Required outlet height for outlet building H_{A1}=H_{S1}+H_{Ü} (Equation 4)  2.83 m  Upstream buildings  Highest recirculation zone from an upstream building H_{A2}=H_{S2}+H_{Ü} (Equation 19)  2.90 m  Required outlet height for undisturbed removal H_{A}=max(H_{A1},H_{A2) (Figure 2)})  2.83 m  Exposure zone  Highest air intake in exposure zone R H_{F}  10.40 m  Required outlet height for adequate dilution H_{E}=H_{F}+H_{B}  9.40 m 
 Height of exhaust gas discharge system H_{M}=max(H_{A},H_{E}) over the ridge  2.8 m 
Sample A 1 from the guideline. Real building ensemble Calculation for the exhaust gas discharge system 'X3'Details for building 'House 1'  Symmetric pitch roof α ≥ 20°Quantity  Parameter  Value 

Height of ground over origin of coordinates (Section 6.2.4, Figure 10)  Δh  2.10 m  Ridge height  H_{First}  11.50 m  Eaves height (Figure 4)  H_{Traufe}  7.50 m  Actual roof height (Figure 4, Section 6.2.1.2.2)  H_{Dach}  4.00 m  Width of half of the gable end opposite the outlet. For symmetric roof this will be b/2 else b  b_{Luv}  6.70 m  Horizontal distance between the center of the outlet crosssection and the ridge (Figure 4)  a  0.20 m  Roof pitch angle (Figure 4)  α  30.84 °  Roof pitch correction (interpolated with table 2)  γ  0.56 °  Factor for determining H_{2} (interpolated with table 2)  f  0.69  Height of recirculation zone for distance a to ridge (Equation 1)  H_{1}  0.12 m  Maximum height of the recirculation zone (Equation 2)  H_{2}  2.76 m  Calculated height of exhaust gas discharge system over ridge (Equation 3)  H_{S1}  0.12 m  Horizontal extend of the recirculation zone (Equation 15, Figure 8)  l_{RZ}  18.27 m  Effective length of an upstream building (Equation 16, Figure 8)  l_{eff}  13.50 m  Angle between the gable side of the upstream building and the line to exhaust gas discharge system (Section 6.2.2.1, Figure 8)  β  89.67 °  Horizontal distance of the exhaust gas discharge system from the upstream building (Figure 8)  l_{A}  25.67 m  The exhaust gas discharge system is outside the recirculation zone  H_{S2}  0.00 m 
Details for building 'House 2'  Symmetric pitch roof α ≥ 20°Quantity  Parameter  Value 

Height of ground over origin of coordinates (Section 6.2.4, Figure 10)  Δh  0.00 m  Ridge height  H_{First}  6.80 m  Eaves height (Figure 4)  H_{Traufe}  3.40 m  Actual roof height (Figure 4, Section 6.2.1.2.2)  H_{Dach}  3.40 m  Width of half of the gable end opposite the outlet. For symmetric roof this will be b/2 else b  b_{Luv}  6.35 m  Horizontal distance between the center of the outlet crosssection and the ridge (Figure 4)  a  30.93 m  Roof pitch angle (Figure 4)  α  28.17 °  Roof pitch correction (interpolated with table 2)  γ  0.00 °  Factor for determining H_{2} (interpolated with table 2)  f  0.73  Height of recirculation zone for distance a to ridge (Equation 1)  H_{1}  16.56 m  Maximum height of the recirculation zone (Equation 2)  H_{2}  2.47 m  Calculated height of exhaust gas discharge system over ridge (Equation 3)  H_{S1}  2.47 m  Horizontal extend of the recirculation zone (Equation 15, Figure 8)  l_{RZ}  15.25 m  Effective length of an upstream building (Equation 16, Figure 8)  l_{eff}  12.82 m  Angle between the gable side of the upstream building and the line to exhaust gas discharge system (Section 6.2.2.1, Figure 8)  β  20.72 °  Horizontal distance of the exhaust gas discharge system from the upstream building (Figure 8)  l_{A}  26.28 m  The exhaust gas discharge system is outside the recirculation zone  H_{S2}  0.00 m 
Details for building 'House 3'  Symmetric pitch roof α ≥ 20°Quantity  Parameter  Value 

Height of ground over origin of coordinates (Section 6.2.4, Figure 10)  Δh  0.00 m  Ridge height  H_{First}  10.40 m  Eaves height (Figure 4)  H_{Traufe}  6.70 m  Actual roof height (Figure 4, Section 6.2.1.2.2)  H_{Dach}  3.70 m  Width of half of the gable end opposite the outlet. For symmetric roof this will be b/2 else b  b_{Luv}  5.65 m  Horizontal distance between the center of the outlet crosssection and the ridge (Figure 4)  a  0.00 m  Roof pitch angle (Figure 4)  α  33.22 °  Roof pitch correction (interpolated with table 2)  γ  2.15 °  Factor for determining H_{2} (interpolated with table 2)  f  0.66  Height of recirculation zone for distance a to ridge (Equation 1)  H_{1}  0.00 m  Maximum height of the recirculation zone (Equation 2)  H_{2}  2.43 m  Calculated height of exhaust gas discharge system over ridge (Equation 3)  H_{S1}  0.00 m 
Details for building 'House 4'  Symmetric pitch roof α ≥ 20°Quantity  Parameter  Value 

Height of ground over origin of coordinates (Section 6.2.4, Figure 10)  Δh  0.00 m  Ridge height  H_{First}  7.00 m  Eaves height (Figure 4)  H_{Traufe}  3.40 m  Actual roof height (Figure 4, Section 6.2.1.2.2)  H_{Dach}  3.60 m  Width of half of the gable end opposite the outlet. For symmetric roof this will be b/2 else b  b_{Luv}  4.95 m  Horizontal distance between the center of the outlet crosssection and the ridge (Figure 4)  a  35.16 m  Roof pitch angle (Figure 4)  α  36.03 °  Roof pitch correction (interpolated with table 2)  γ  4.02 °  Factor for determining H_{2} (interpolated with table 2)  f  0.62  Height of recirculation zone for distance a to ridge (Equation 1)  H_{1}  21.98 m  Maximum height of the recirculation zone (Equation 2)  H_{2}  2.23 m  Calculated height of exhaust gas discharge system over ridge (Equation 3)  H_{S1}  2.23 m  Horizontal extend of the recirculation zone (Equation 15, Figure 8)  l_{RZ}  17.34 m  Effective length of an upstream building (Equation 16, Figure 8)  l_{eff}  15.33 m  Angle between the gable side of the upstream building and the line to exhaust gas discharge system (Section 6.2.2.1, Figure 8)  β  27.98 °  Horizontal distance of the exhaust gas discharge system from the upstream building (Figure 8)  l_{A}  34.21 m  The exhaust gas discharge system is outside the recirculation zone  H_{S2}  0.00 m 
Details for building 'House 5'  Symmetric pitch roof α ≥ 20°Quantity  Parameter  Value 

Height of ground over origin of coordinates (Section 6.2.4, Figure 10)  Δh  1.70 m  Ridge height  H_{First}  11.00 m  Eaves height (Figure 4)  H_{Traufe}  6.10 m  Actual roof height (Figure 4, Section 6.2.1.2.2)  H_{Dach}  4.90 m  Width of half of the gable end opposite the outlet. For symmetric roof this will be b/2 else b  b_{Luv}  7.80 m  Horizontal distance between the center of the outlet crosssection and the ridge (Figure 4)  a  1.78 m  Roof pitch angle (Figure 4)  α  32.14 °  Roof pitch correction (interpolated with table 2)  γ  1.42 °  Factor for determining H_{2} (interpolated with table 2)  f  0.67  Height of recirculation zone for distance a to ridge (Equation 1)  H_{1}  1.06 m  Maximum height of the recirculation zone (Equation 2)  H_{2}  3.29 m  Calculated height of exhaust gas discharge system over ridge (Equation 3)  H_{S1}  1.06 m  Horizontal extend of the recirculation zone (Equation 15, Figure 8)  l_{RZ}  21.71 m  Effective length of an upstream building (Equation 16, Figure 8)  l_{eff}  17.28 m  Angle between the gable side of the upstream building and the line to exhaust gas discharge system (Section 6.2.2.1, Figure 8)  β  84.60 °  Horizontal distance of the exhaust gas discharge system from the upstream building (Figure 8)  l_{A}  9.57 m  Height of the outlet required by the upstream buildings over the ridge of 'House 3' (Equation 17, Figure 8)  H_{S2}  4.13 m 
Height of recirculation zones for the upstream buildings at the outlet system 'X3' over ridge 'House 3'Name of the building  Height of recirculation zone H_{S2} 

House 1    House 2    House 4    House 5  4.13 m 
Calculation for the outlet 'X3' on building 'House 3' All heights over ridgeQuantity  Value 

Parameter for solid fuel combustion. Nominal heat output: 15 kW  Additive term H_{Ü} (Table 1)  0.40 m  Outlet height above reference level H_{B} (Table 3)  1.00 m  Radius of exposure zone R (Table 3)  15.00 m  Outlet building  Required outlet height for outlet building H_{A1}=H_{S1}+H_{Ü} (Equation 4)  0.40 m  Upstream buildings  Highest recirculation zone from an upstream building H_{A2}=H_{S2}+H_{Ü} (Equation 19)  4.53 m  Required outlet height for undisturbed removal H_{A}=max(H_{A1},H_{A2) (Figure 2)})  4.53 m  Exposure zone  Highest air intake in exposure zone R H_{F}  0.10 m  Required outlet height for adequate dilution H_{E}=H_{F}+H_{B}  0.90 m 
 Height of exhaust gas discharge system H_{M}=max(H_{A},H_{E}) over the ridge  4.5 m 
