## 3 Materials and Methods
\begin{table}
\begin{tabular}{c c c c c c c c c} \hline \hline \multirow{2}{*}{**No.**} & \multirow{2}{*}{**Element**} & \multirow{2}{*}{**Material**} & \multicolumn{3}{c}{**Length According to the Width of the Leaf**} & \multicolumn{2}{c}{**Width \(\times\)**} & \multirow{2}{*}{**Pieces**} \\ \cline{3-3} \cline{5-8}  & & & **60** & **70** & **80** & **90** & **100** & \\ \hline
1 & vertical tile & hard wood—oak & 2042 & 2042 & 2042 & 2042 & \(46\times 37.1\) & 2 \\
2 & top horizontal tile & hard wood—oak & 562 & 662 & 762 & 870 & 962 & \(46\times 37.1\) & 1 \\
3 & bottom horizontal & soft wood—pine & 562 & 662 & 762 & 870 & 962 & \(46\times 37.1\) & 1 \\
4 & bottom horizontal & hard wood—oak & 562 & 662 & 762 & 870 & 962 & \(46\times 37.1\) & 1 \\
5 & door filling & solid particleboard & 560 & 660 & 760 & 868 & 960 & \(1902\times 12\) & 3 \\
6 & cladding & HDF & 660 & 760 & 860 & 966 & 1060 & \(2050\times 3-5\) & 2 \\
7 & top layer & laminate CPL & 660 & 760 & 860 & 966 & 1060 & \(2050\times 0.2-1\) & 2 \\ \hline \hline \end{tabular}
\begin{tabular}{c c c c c c c c c} \hline \hline \multirow{2}{*}{No.} & \multirow{2}{*}{Element} & \multirow{2}{*}{Material} & \multicolumn{3}{c}{Length According to the Width of the Leaf} & \multicolumn{2}{c}{Width \(\times\)} & \multirow{2}{*}{Pieces} \\ \cline{3-3} \cline{5-8}  & & & 60 & 70 & 80 & 90 & 100 & \\ \hline
1 & vertical tile & hard wood—oak & 2038 & 2038 & 2038 & 2038 & 2038 & \(44\times 37.1\) & 2 \\
2 & top horizontal tile & hard wood—oak & 562 & 662 & 762 & 870 & 962 & \(44\times 37.1\) & 1 \\
3 & bottom horizontal & soft wood—pine & 562 & 662 & 762 & 870 & 962 & \(45\times 37.1\) & 1 \\
4 & title internal & hard wood—oak & 562 & 662 & 762 & 870 & 962 & \(45\times 37.1\) & 1 \\
4 & bottom horizontal & & 560 & 660 & 760 & 868 & 960 & \(1902\times 12\) & 3 \\
5 & tile external & & 656 & 756 & 856 & 962 & \(1056\) & \(2046\times 0.2-1\) & 2 \\ \hline \hline \end{tabular}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{2}{*}{No.} & \multirow{2}{*}{Element} & \multirow{2}{*}{Material} & \multicolumn{3}{c}{Length According to the Width of the Leaf} & \multicolumn{2}{c}{Width \(\times\)} & \multirow{2}{*}{Pieces} \\ \cline{3-3} \cline{5-8}  & & & 60 & 70 & 80 & 90 & 100 & \\ \hline
1 & vertical tile & hard wood—oak & 2038 & 2038 & 2038 & 2038 & \(46\times 37.1\) & 2 \\
2 & top horizontal tile & hard wood—oak & 558 & 658 & 758 & 866 & 958 & \(46\times 37.1\) & 1 \\
3 & bottom horizontal & & 558 & 658 & 758 & 866 & 958 & \(46\times 37.1\) & 1 \\
6 & cladding & HDF & 558 & 658 & 758 & 866 & 958 & \(46\times 37.1\) & 1 \\
7 & top layer & laminate CPL & 656 & 756 & 856 & 962 & \(1056\) & \(2046\times 0.2-1\) & 2 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Construction 4. Previously used values of machining allowances; reduced machining allowances, variant 1; variant 2. Figure 4: Door construction 2. Figure 5: Door construction 3. Construction 4 (Figure 5) is distinguished by the fact that the filling of the leaf was a special five-layer Fireproof PORTA structure in a frame made of softwood plywood. The entire structure was covered with HDF board. The sides of the leaf were covered with ABS (acrylonitrile-butadiene-styrene) tape and were given a seal that swells when exposed to fire. The values of material savings were calculated per 1000 leaves. With known volumes of actual production in 2020 (Table 5), material savings were calculated on an annual basis for major construction materials, taking into account the quantitative proportions of the production volume of individual door constructions over the entire quantity of products manufactured in 2020. The final amount of achievable wood savings also takes into account the material efficiency of the pretreatment. Because of the two-stage processing--obtaining blanks (battens from lumber) and milling the leaves--the material efficiency index of the pretreatment must be considered when estimating savings.