Chowotchera mapaipi ndi zida zopulumutsa mphamvu zomwe zimatenthetsa poyambira.Imayikidwa pamaso pa zida zotenthetsera zapakati kuti ziwotche mwachindunji sing'angayo, kuti zitha kuzungulira kutentha kwambiri, ndikukwaniritsa cholinga chopulumutsa mphamvu.Amagwiritsidwa ntchito kwambiri potenthetsera mafuta amafuta monga mafuta olemera, asphalt, ndi mafuta omveka bwino.