Intonga yokulinganisa ukuphakama kwempahla ye-insulation ye-telescopic ejikelezayo sisikali se-metric, intonga ephambili ye-insulation yenziwe ngetyhubhu yeglasi ye-epoxy enamandla aphezulu, imveliso ineempawu zombane kunye nezoomatshini ezibalaseleyo, ukuphakama kwentonga ubunzima obulula, kulula ukuyisebenzisa, kunokulinganiswa ukusuka kubude bomhlaba bempahla, kodwa kunye nokuphakama kwemigca yombane ephezulu, imigca yonxibelelwano, njl.